100-495: The Boeing Insitu RQ-21 Blackjack , company name Integrator , is an American unmanned air vehicle designed and built by Boeing Insitu to meet a United States Navy requirement for a small tactical unmanned air system (STUAS). It is a twin-boom, single-engine monoplane , designed as a supplement to the Boeing Scan Eagle . The Integrator weighs 61 kg (134 lb) and uses the same launcher and recovery system as
200-465: A balloon carrier (the precursor to the aircraft carrier ) in the first offensive use of air power in naval aviation . Austrian forces besieging Venice attempted to launch some 200 incendiary balloons at the besieged city. The balloons were launched mainly from land; however, some were also launched from the Austrian ship SMS Vulcano . At least one bomb fell in the city; however, due to
300-783: A drone , is an aircraft with no human pilot , crew, or passengers on board. UAVs were originally developed through the twentieth century for military missions too "dull, dirty or dangerous" for humans, and by the twenty-first, they had become essential assets to most militaries. As control technologies improved and costs fell, their use expanded to many non-military applications. These include aerial photography , area coverage, precision agriculture , forest fire monitoring, river monitoring, environmental monitoring , policing and surveillance, infrastructure inspections, smuggling, product deliveries , entertainment, and drone racing . Many terms are used for aircraft which fly without any persons on board. The term drone has been used from
400-513: A synthetic-aperture radar to track ground targets, a laser designator to mark targets for precision-guided munitions, and foliage-penetration capabilities for foreign customers operating in lush environments. The Office of Naval Research (ONR) plans to add a sensor to the Blackjack that combines an electro-optical camera, wide area imager, short wave infrared hyperspectral imager, and a high-resolution camera for use as an inspection sensor into
500-490: A "powered, aerial vehicle that does not carry a human operator, uses aerodynamic forces to provide vehicle lift, can fly autonomously or be piloted remotely, can be expendable or recoverable, and can carry a lethal or nonlethal payload". UAV is a term that is commonly applied to military use cases. Missiles with warheads are generally not considered UAVs because the vehicle itself is a munition, but certain types of propeller-based missile are often called " kamikaze drones " by
600-408: A 2D sinusoid at a given frequency without distortion while minimizing the variance of the noise of the resulting image. The purpose is to compute the spectral estimate efficiently. Spectral estimate is given as where R is the covariance matrix, and a ω 1 , ω 2 ∗ {\displaystyle a_{\omega _{1},\omega _{2}}^{*}}
700-441: A camera) that weigh considerably less than an adult human, and as a result, can be considerably smaller. Though they carry heavy payloads, weaponized military UAVs are lighter than their crewed counterparts with comparable armaments. Small civilian UAVs have no life-critical systems , and can thus be built out of lighter but less sturdy materials and shapes, and can use less robustly tested electronic control systems. For small UAVs,
800-601: A component of an unmanned aircraft system ( UAS ), which also includes a ground-based controller and a system of communications with the aircraft. The term UAS was adopted by the United States Department of Defense (DoD) and the United States Federal Aviation Administration (FAA) in 2005 according to their Unmanned Aircraft System Roadmap 2005–2030. The International Civil Aviation Organization (ICAO) and
900-410: A host of advanced technologies that allow them to carry out their missions without human intervention, such as cloud computing, computer vision, artificial intelligence, machine learning, deep learning, and thermal sensors. For recreational uses, an aerial photography drone is an aircraft that has first-person video, autonomous capabilities, or both. An unmanned aerial vehicle ( UAV ) is defined as
1000-413: A human operator, as remotely piloted aircraft ( RPA ), or with various degrees of autonomy , such as autopilot assistance, up to fully autonomous aircraft that have no provision for human intervention. Based on the altitude, the following UAV classifications have been used at industry events such as ParcAberporth Unmanned Systems forum: An example of classification based on the composite criteria
1100-837: A human target in Libya , according to a report from the UN Security Council 's Panel of Experts on Libya, published in March 2021. This may have been the first time an autonomous killer-robot armed with lethal weaponry attacked human beings. Superior drone technology, specifically the Turkish Bayraktar TB2 , played a role in Azerbaijan's successes in the 2020 Nagorno-Karabakh war against Armenia. UAVs are also used in NASA missions. The Ingenuity helicopter
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#17327808882421200-596: A laser range finder, a communications relay package, and automatic identification system receivers. The models in Afghanistan were early operational capability (EOC) aircraft without shipboard software or testing. Deploying the aircraft on the ground was a method to detect and fix problems early to avoid delaying the project. The RQ-21 returned from its deployment on 10 September 2014 after flying nearly 1,000 hours in 119 days in theater. EOC Blackjacks will continue to be used for training, while completion of shipboard testing
1300-465: A moving platform, such as an aircraft or spacecraft, and has its origins in an advanced form of side looking airborne radar (SLAR). The distance the SAR device travels over a target during the period when the target scene is illuminated creates the large synthetic antenna aperture (the size of the antenna). Typically, the larger the aperture, the higher the image resolution will be, regardless of whether
1400-436: A parallel increase in the use of drones for consumer and general aviation activities. As of 2021, quadcopter drones exemplify the widespread popularity of hobby radio-controlled aircraft and toys, however the use of UAVs in commercial and general aviation is limited by a lack of autonomy and by new regulatory environments which require line-of-sight contact with the pilot. In 2020, a Kargu 2 drone hunted down and attacked
1500-551: A point ( ω x , ω y {\displaystyle \omega _{x},\omega _{y}} ) is given by: where ϕ ^ E V {\displaystyle {\hat {\phi }}_{EV}} is the amplitude of the image at a point ( ω x , ω y ) {\displaystyle \left(\omega _{x},\omega _{y}\right)} , v i _ {\displaystyle {\underline {v_{i}}}}
1600-513: A point in the SAR image is in alignment to one of the signal subspace eigenvectors which is the peak in image estimate. Thus this method does not accurately represent the scattering intensity at each point, but show the particular points of the image. Backprojection Algorithm has two methods: Time-domain Backprojection and Frequency-domain Backprojection . The time-domain Backprojection has more advantages over frequency-domain and thus,
1700-402: A range of viewing distances. To create a SAR image, successive pulses of radio waves are transmitted to "illuminate" a target scene, and the echo of each pulse is received and recorded. The pulses are transmitted and the echoes received using a single beam-forming antenna, with wavelengths of a meter down to several millimeters. As the SAR device on board the aircraft or spacecraft moves,
1800-405: A single module. Synthetic-aperture radar Synthetic-aperture radar ( SAR ) is a form of radar that is used to create two-dimensional images or three-dimensional reconstructions of objects, such as landscapes. SAR uses the motion of the radar antenna over a target region to provide finer spatial resolution than conventional stationary beam-scanning radars. SAR is typically mounted on
1900-642: A single payload by 2020. In Marines service, the Blackjack sometimes uses the designation MQ-21, where the 'M' prefix indicates a multipurpose operations platform, versus the 'R' prefix indicating a primary reconnaissance mission. The U.S. Marine Corps deployed its first RQ-21A Blackjack system to Afghanistan in late April 2014. One Blackjack system is composed of five air vehicles, two ground control systems, and launch and recovery support equipment. It supports intelligence, surveillance, and reconnaissance (ISR) missions using multi-intelligence payloads including day and night full-motion video cameras, an infrared marker,
2000-415: A variable payload are more likely to feature a distinct fuselage with a tail for stability, control and trim, although the wing configurations in use vary widely. For uses that require vertical flight or hovering, the tailless quadcopter requires a relatively simple control system and is common for smaller UAVs. Multirotor designs with 6 or more rotors is more common with larger UAVs, where redundancy
2100-594: Is 16 ft (4.9 m) and it can carry a 39 lb (18 kg) payload. The day/night camera can achieve resolution rating of 7 on the NIIRS scale at 8,000 ft (2,400 m). The Marines are working with Insitu to modify the Blackjack fuselage to carry greater and more various payloads. Enlarging the fuselage would increase its maximum takeoff weight from 135 lb (61 kg) to 145 lb (66 kg) and lengthen endurance from 16 hours to 24 hours. New turrets are being explored as well as other payloads including
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#17327808882422200-519: Is U.S. Military's unmanned aerial systems (UAS) classification of UAVs based on weight, maximum altitude and speed of the UAV component. UAVs can be classified based on their power or energy source, which significantly impacts their flight duration, range, and environmental impact. The main categories include: The earliest recorded use of an unmanned aerial vehicle for warfighting occurred in July 1849, with
2300-555: Is a nonparametric covariance-based method, which uses an adaptive matched-filterbank approach and follows two main steps: The adaptive Capon bandpass filter is designed to minimize the power of the filter output, as well as pass the frequencies ( ω 1 , ω 2 {\displaystyle \omega _{1},\omega _{2}} ) without any attenuation, i.e., to satisfy, for each ( ω 1 , ω 2 {\displaystyle \omega _{1},\omega _{2}} ), where R
2400-550: Is a parameter-free sparse signal reconstruction based algorithm. It achieves super-resolution and is robust to highly correlated signals. The name emphasizes its basis on the asymptotically minimum variance (AMV) criterion. It is a powerful tool for the recovery of both the amplitude and frequency characteristics of multiple highly correlated sources in challenging environment (e.g., limited number of snapshots, low signal-to-noise ratio . Applications include synthetic-aperture radar imaging and various source localization. SAMV method
2500-742: Is also a special case of the FIR filtering approaches. It is seen that although the APES algorithm gives slightly wider spectral peaks than the Capon method, the former yields more accurate overall spectral estimates than the latter and the FFT method. FFT method is fast and simple but have larger sidelobes. Capon has high resolution but high computational complexity. EV also has high resolution and high computational complexity. APES has higher resolution, faster than capon and EV but high computational complexity. MUSIC method
2600-551: Is also less of a critical requirement for unmanned aircraft, allowing the designer greater freedom to experiment. Instead, UAVs are typically designed around their onboard payloads and their ground equipment. These factors have led to a great variety of airframe and motor configurations in UAVs. For conventional flight the flying wing and blended wing body offer light weight combined with low drag and stealth , and are popular configurations for many use cases. Larger types which carry
2700-473: Is an autonomous UAV that operated on Mars from 2021 to 2024. Current the Dragonfly spacecraft is being developed, and is aiming to reach and examine Saturn 's moon Titan . Its primary goal is to roam around the surface, expanding the amount of area to be researched previously seen by landers . As a UAV, Dragonfly allows examination of potentially diverse types of soil. The drone is set to launch in 2027, and
2800-459: Is capable of achieving resolution higher than some established parametric methods, e.g., MUSIC , especially with highly correlated signals. Computational complexity of the SAMV method is higher due to its iterative procedure. This subspace decomposition method separates the eigenvectors of the autocovariance matrix into those corresponding to signals and to clutter. The amplitude of the image at
2900-456: Is critical to operation of the EV method. The eigenvalue of the R matrix decides whether its corresponding eigenvector corresponds to the clutter or to the signal subspace. The MUSIC method is considered to be a poor performer in SAR applications. This method uses a constant instead of the clutter subspace. In this method, the denominator is equated to zero when a sinusoidal signal corresponding to
3000-407: Is essentially a realization of the mapping of the mathematical framework through generation of the variants and executing matrix operations. The performance of this implementation may vary from machine to machine, and the objective is to identify on which machine it performs best. The Capon spectral method, also called the minimum-variance method, is a multidimensional array-processing technique. It
3100-463: Is estimated to take seven more years to reach the Saturnian system. Miniaturization is also supporting the development of small UAVs which can be used as individual system or in a fleet offering the possibility to survey large areas, in a relatively small amount of time. According to data from GlobalData , the global military uncrewed aerial systems (UAS) market, which forms a significant part of
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3200-448: Is more preferred. The time-domain Backprojection forms images or spectrums by matching the data acquired from the radar and as per what it expects to receive. It can be considered as an ideal matched-filter for synthetic-aperture radar. There is no need of having a different motion compensation step due to its quality of handling non-ideal motion/sampling. It can also be used for various imaging geometries. In GEO-SAR, to focus specially on
3300-458: Is not advantageous to capture a waveform for each of both transmission directions for a given pair of antennas, because those waveforms will be identical. When multiple static antennas are used, the total number of unique echo waveforms that can be captured is where N is the number of unique antenna positions. The antenna stays in a fixed position. It may be orthogonal to the flight path, or it may be squinted slightly forward or backward. When
3400-671: Is not generally suitable for SAR imaging, as whitening the clutter eigenvalues destroys the spatial inhomogeneities associated with terrain clutter or other diffuse scattering in SAR imagery. But it offers higher frequency resolution in the resulting power spectral density (PSD) than the fast Fourier transform (FFT)-based methods. The backprojection algorithm is computationally expensive. It is specifically attractive for sensors that are wideband, wide-angle, and/or have long coherent apertures with substantial off-track motion. SAR requires that echo captures be taken at multiple antenna positions. The more captures taken (at different antenna locations)
3500-644: Is planned to result in the system's first ship-based deployment in spring 2015. The Marine Corps declared Initial Operational Capability (IOC) for the RQ-21A Blackjack in January 2016. During the summer of 2016, MARSOC deployed the RQ-21A to Iraq. Full rate productions of the RQ-21A has been delayed because of serious system quality issues. The Office of the Secretary of Defense (OSD) issued reviews on
3600-490: Is prioritized. Traditional internal combustion and jet engines remain in use for drones requiring long range. However, for shorter-range missions electric power has almost entirely taken over. The distance record for a UAV (built from balsa wood and mylar skin) across the North Atlantic Ocean is held by a gasoline model airplane or UAV. Manard Hill "in 2003 when one of his creations flew 1,882 miles across
3700-597: Is provided by the SAR. SAR images have wide applications in remote sensing and mapping of surfaces of the Earth and other planets. Applications of SAR are numerous. Examples include topography, oceanography, glaciology, geology (for example, terrain discrimination and subsurface imaging). SAR can also be used in forestry to determine forest height, biomass, and deforestation. Volcano and earthquake monitoring use differential interferometry . SAR can also be applied for monitoring civil infrastructure stability such as bridges. SAR
3800-621: Is the coherency matrix and v i _ H {\displaystyle {\underline {v_{i}}}^{\mathsf {H}}} is the Hermitian of the coherency matrix, 1 λ i {\displaystyle {\frac {1}{\lambda _{i}}}} is the inverse of the eigenvalues of the clutter subspace, W ( ω x , ω y ) {\displaystyle W\left(\omega _{x},\omega _{y}\right)} are vectors defined as where ⊗ denotes
3900-392: Is the covariance matrix , h ω 1 , ω 2 ∗ {\displaystyle h_{\omega _{1},\omega _{2}}^{*}} is the complex conjugate transpose of the impulse response of the FIR filter, a ω 1 , ω 2 {\displaystyle a_{\omega _{1},\omega _{2}}}
4000-439: Is the 2D Fourier vector, defined as a ω 1 , ω 2 ≜ a ω 1 ⊗ a ω 2 {\displaystyle a_{\omega _{1},\omega _{2}}\triangleq a_{\omega _{1}}\otimes a_{\omega _{2}}} , ⊗ {\displaystyle \otimes } denotes Kronecker product. Therefore, it passes
4100-457: Is the 2D complex-conjugate transpose of the Fourier vector. The computation of this equation over all frequencies is time-consuming. It is seen that the forward–backward Capon estimator yields better estimation than the forward-only classical capon approach. The main reason behind this is that while the forward–backward Capon uses both the forward and backward data vectors to obtain the estimate of
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4200-513: Is used in majority of the spectral estimation algorithms, and there are many fast algorithms for computing the multidimensional discrete Fourier transform. Computational Kronecker-core array algebra is a popular algorithm used as new variant of FFT algorithms for the processing in multidimensional synthetic-aperture radar (SAR) systems. This algorithm uses a study of theoretical properties of input/output data indexing sets and groups of permutations. A branch of finite multi-dimensional linear algebra
4300-411: Is used to identify similarities and differences among various FFT algorithm variants and to create new variants. Each multidimensional DFT computation is expressed in matrix form. The multidimensional DFT matrix, in turn, is disintegrated into a set of factors, called functional primitives, which are individually identified with an underlying software/hardware computational design. The FFT implementation
4400-408: Is useful in environment monitoring such as oil spills, flooding, urban growth, military surveillance: including strategic policy and tactical assessment. SAR can be implemented as inverse SAR by observing a moving target over a substantial time with a stationary antenna. A synthetic-aperture radar is an imaging radar mounted on a moving platform. SAR is a Doppler technique. It is based on
4500-533: The 1991 Gulf War . UAVs demonstrated the possibility of cheaper, more capable fighting-machines, deployable without risk to aircrews. Initial generations primarily involved surveillance aircraft , but some carried armaments , such as the General Atomics MQ-1 Predator , that launched AGM-114 Hellfire air-to-ground missiles . CAPECON , a European Union project to develop UAVs, ran from 1 May 2002 to 31 December 2005. As of 2012 ,
4600-891: The Argus As 292 and the V-1 flying bomb with a jet engine . Fascist Italy developed a specialised drone version of the Savoia-Marchetti SM.79 flown by remote control, although the Armistice with Italy was enacted prior to any operational deployment. After World War II development continued in vehicles such as the American JB-4 (using television/radio-command guidance), the Australian GAF Jindivik and Teledyne Ryan Firebee I of 1951, while companies like Beechcraft offered their Model 1001 for
4700-725: The British Civil Aviation Authority adopted this term, also used in the European Union's Single European Sky (SES) Air Traffic Management (ATM) Research (SESAR Joint Undertaking) roadmap for 2020. This term emphasizes the importance of elements other than the aircraft. It includes elements such as ground control stations, data links and other support equipment. Similar terms are unmanned aircraft vehicle system ( UAVS ) and remotely piloted aircraft system ( RPAS ). Many similar terms are in use. Under new regulations which came into effect 1 June 2019,
4800-460: The Kronecker product of the two vectors. MUSIC detects frequencies in a signal by performing an eigen decomposition on the covariance matrix of a data vector of the samples obtained from the samples of the received signal. When all of the eigenvectors are included in the clutter subspace (model order = 0) the EV method becomes identical to the Capon method. Thus the determination of model order
4900-564: The U.S. Navy in 1955. Nevertheless, they were little more than remote-controlled airplanes until the Vietnam War . In 1959, the U.S. Air Force , concerned about losing pilots over hostile territory, began planning for the use of uncrewed aircraft. Planning intensified after the Soviet Union shot down a U-2 in 1960. Within days, a highly classified UAV program started under the code name of "Red Wagon". The August 1964 clash in
5000-585: The United States Air Force (USAF) employed 7,494 UAVs – almost one in three USAF aircraft. The Central Intelligence Agency also operated UAVs . By 2013 at least 50 countries used UAVs. China, Iran, Israel, Pakistan, Turkey, and others designed and built their own varieties. The use of drones has continued to increase. Due to their wide proliferation, no comprehensive list of UAV systems exists. The development of smart technologies and improved electrical-power systems led to
5100-503: The United States Department of Defense , UAVs are classified into five categories below: Other classifications of UAVs include: There are usually five categories when UAVs are classified by range and endurance: There are usually four categories when UAVs are classified by size, with at least one of the dimensions (length or wingspan) meet the following respective limits: Based on their weight, drones can be classified into 5 categories— . Drones could also be classified based on
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#17327808882425200-456: The hydrogen fuel cell . The energy density of modern Li-Po batteries is far less than gasoline or hydrogen. However electric motors are cheaper, lighter and quieter. Complex multi-engine, multi-propeller installations are under development with the goal of improving aerodynamic and propulsive efficiency. For such complex power installations, battery elimination circuitry (BEC) may be used to centralize power distribution and minimize heating, under
5300-401: The quadcopter design has become popular, though this layout is rarely used for crewed aircraft. Miniaturization means that less-powerful propulsion technologies can be used that are not feasible for crewed aircraft, such as small electric motors and batteries. Control systems for UAVs are often different from crewed craft. For remote human control, a camera and video link almost always replace
5400-459: The 1900s, and originally focused on providing practice targets for training military personnel . The earliest attempt at a powered UAV was A. M. Low 's "Aerial Target" in 1916. Low confirmed that Geoffrey de Havilland's monoplane was the one that flew under control on 21 March 1917 using his radio system. Following this successful demonstration in the spring of 1917 Low was transferred to develop aircraft controlled fast motor launches D.C.B.s with
5500-608: The 1973 Yom Kippur war, a few key people from the team that developed this early UAV joined a small startup company that aimed to develop UAVs into a commercial product, eventually purchased by Tadiran and leading to the development of the first Israeli UAV. In 1973, the U.S. military officially confirmed that they had been using UAVs in Southeast Asia (Vietnam). Over 5,000 U.S. airmen had been killed and over 1,000 more were missing or captured . The USAF 100th Strategic Reconnaissance Wing flew about 3,435 UAV missions during
5600-638: The 1980s and 1990s, interest in UAVs grew within the higher echelons of the U.S. military. The U.S. funded the Counterterrorism Center (CTC) within the CIA, which sought to fight terrorism with the aid of modernized drone technology. In the 1990s, the U.S. DoD gave a contract to AAI Corporation along with Israeli company Malat. The U.S. Navy bought the AAI Pioneer UAV that AAI and Malat developed jointly. Many of these UAVs saw service in
5700-551: The Atlantic Ocean on less than a gallon of fuel" holds this record. Besides the traditional piston engine, the Wankel rotary engine is used by some drones. This type offers high power output for lower weight, with quieter and more vibration-free running. Claims have also been made for improved reliability and greater range. Small drones mostly use lithium-polymer batteries (Li-Po), while some larger vehicles have adopted
5800-455: The Blackjack. The RQ-21A Blackjack is designed to support the U.S. Marine Corps by providing forward reconnaissance. A Blackjack system is composed of five air vehicles and two ground control systems. The air vehicles can be launched on land or on a ship by a rail and land using a "skyhook" recovery system, where a vertical wire must be hooked onto its wing; when on the ground, the launch and recovery systems are towable by vehicles. Its wingspan
5900-424: The Capon method, but more accurate spectral estimates for amplitude in SAR. In the Capon method, although the spectral peaks are narrower than the APES, the sidelobes are higher than that for the APES. As a result, the estimate for the amplitude is expected to be less accurate for the Capon method than for the APES method. The APES method requires about 1.5 times more computation than the Capon method. SAMV method
6000-601: The Middle East, Israeli intelligence tested the first tactical UAVs installed with reconnaissance cameras, which successfully returned photos from across the Suez Canal. This was the first time that tactical UAVs that could be launched and landed on any short runway (unlike the heavier jet-based UAVs) were developed and tested in battle. In the 1973 Yom Kippur War , Israel used UAVs as decoys to spur opposing forces into wasting expensive anti-aircraft missiles. After
6100-582: The RQ-21A Blackjack unmanned aerial system achieved full operational capability in 2019. In March 2020, the RQ-21A Blackjack team at Patuxent River was awarded the NAVAIR Commander's Award for Platform Team With Highest Readiness. In April 2021, the Naval Supply Systems Command Weapon Systems Support (NAVSUP WSS) Unmanned Aerial Systems (UAS) Integrated Weapon System Team (IWST) was able to support
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#17327808882426200-550: The Royal Navy in 1918 intended to attack shipping and port installations and he also assisted Wing Commander Brock in preparations for the Zeebrugge Raid . Other British unmanned developments followed, leading to the fleet of over 400 de Havilland 82 Queen Bee aerial targets that went into service in 1935. Nikola Tesla described a fleet of uncrewed aerial combat vehicles in 1915. These developments also inspired
6300-423: The SAR image stack are a sampled version of the Fourier transform of reflectivity in elevation direction, but the Fourier transform is irregular. Thus the spectral estimation techniques are used to improve the resolution and reduce speckle compared to the results of conventional Fourier transform SAR imaging techniques. FFT (Fast Fourier Transform i.e., periodogram or matched filter ) is one such method, which
6400-659: The STUAS on land or at sea. This phase of testing was to validate updates made to the aircraft which include software, fuselage, and camera enhancements. The Integrator was test flown at lower density altitudes. Integrated Operational Test and Evaluation (IOT&E) was scheduled for October 2013. In September 2013, the Integrator was renamed the RQ-21A Blackjack. On 28 November 2013, the U.S. Navy awarded Boeing Insitu an $ 8.8 million contract for one low-rate production aircraft in preparation for full-rate production. In January 2014,
6500-579: The Scan Eagle. The RQ-21 was selected in June 2010 over the Raytheon Killer Bee , AAI Aerosonde , and General Dynamics / Elbit Systems Storm. The RQ-21A Integrator first flew on 28 July 2012. On 10 September 2012, the Integrator entered developmental testing with a 66-minute flight. The Navy launched one using a pneumatic launcher and a recovery system known as Skyhook. This eliminates
6600-476: The Syrian air defenses at the start of the 1982 Lebanon War , resulting in no pilots downed. In Israel in 1987, UAVs were first used as proof-of-concept of super-agility, post-stall controlled flight in combat-flight simulations that involved tailless, stealth-technology-based, three-dimensional thrust vectoring flight-control, and jet-steering. With the maturing and miniaturization of applicable technologies in
6700-659: The Tonkin Gulf between naval units of the U.S. and the North Vietnamese Navy initiated America's highly classified UAVs ( Ryan Model 147 , Ryan AQM-91 Firefly , Lockheed D-21 ) into their first combat missions of the Vietnam War . When the Chinese government showed photographs of downed U.S. UAVs via Wide World Photos , the official U.S. response was "no comment". During the War of Attrition (1967–1970) in
6800-456: The UAV industry, is projected to experience a compound annual growth rate of 4.8% over the next decade. This represents a near doubling in market size, from $ 12.5 billion in 2024 to an estimated $ 20 billion by 2034. Crewed and uncrewed aircraft of the same type generally have recognizably similar physical components. The main exceptions are the cockpit and environmental control system or life support systems . Some UAVs carry payloads (such as
6900-563: The achievement of both 100% Mission Capable (MC) and 100% Fully Mission Capable (FMC) rate for the UAS RQ-21A "Blackjack" platform; a feat rarely, if ever, seen by any Type Model Series. An unidentified Middle Eastern customer purchased six systems. Data from Product Page General characteristics Performance Related development Related lists Unmanned aerial vehicle An unmanned aerial vehicle ( UAV ), or unmanned aircraft system ( UAS ), commonly known as
7000-503: The advances of computing technology, beginning with analog controls and evolving into microcontrollers, then system-on-a-chip (SOC) and single-board computers (SBC). Modern system hardware for UAV control is often called the flight controller (FC), flight controller board (FCB) or autopilot. Common UAV-systems control hardware typically incorporate a primary microprocessor, a secondary or failsafe processor, and sensors such as accelerometers, gyroscopes, magnetometers, and barometers into
7100-511: The antenna aperture travels along the flight path, a signal is transmitted at a rate equal to the pulse repetition frequency (PRF). The lower boundary of the PRF is determined by the Doppler bandwidth of the radar. The backscatter of each of these signals is commutatively added on a pixel-by-pixel basis to attain the fine azimuth resolution desired in radar imagery. The spotlight synthetic aperture
7200-614: The antenna location relative to the target changes with time. Signal processing of the successive recorded radar echoes allows the combining of the recordings from these multiple antenna positions. This process forms the synthetic antenna aperture and allows the creation of higher-resolution images than would otherwise be possible with a given physical antenna. SAR is capable of high-resolution remote sensing , independent of flight altitude, and independent of weather, as SAR can select frequencies to avoid weather-caused signal attenuation. SAR has day and night imaging capability as illumination
7300-490: The antenna — each object will have its own doppler shift. A precise frequency analysis of the radar reflections will thus allow the construction of a detailed image. In order to realise this concept, electromagnetic waves are transmitted sequentially, the echoes are collected and the system electronics digitizes and stores the data for subsequent processing. As transmission and reception occur at different times, they map to different small positions. The well ordered combination of
7400-411: The antenna's field of view. The 3D processing is done in two stages. The azimuth and range direction are focused for the generation of 2D (azimuth-range) high-resolution images, after which a digital elevation model (DEM) is used to measure the phase differences between complex images, which is determined from different look angles to recover the height information. This height information, along with
7500-421: The aperture is physical (a large antenna) or synthetic (a moving antenna) – this allows SAR to create high-resolution images with comparatively small physical antennas. For a fixed antenna size and orientation, objects which are further away remain illuminated longer – therefore SAR has the property of creating larger synthetic apertures for more distant objects, which results in a consistent spatial resolution over
7600-617: The azimuth-range coordinates provided by 2-D SAR focusing, gives the third dimension, which is the elevation. The first step requires only standard processing algorithms, for the second step, additional pre-processing such as image co-registration and phase calibration is used. In addition, multiple baselines can be used to extend 3D imaging to the time dimension . 4D and multi-D SAR imaging allows imaging of complex scenarios, such as urban areas, and has improved performance with respect to classical interferometric techniques such as persistent scatterer interferometry (PSI). SAR algorithms model
7700-484: The cockpit windows; radio-transmitted digital commands replace physical cockpit controls. Autopilot software is used on both crewed and uncrewed aircraft, with varying feature sets. UAVs can be designed in different configurations than manned aircraft both because there is no need for a cockpit and its windows, and there is no need to optimize for human comfort, although some UAVs are adapted from piloted examples, or are designed for optionally piloted modes. Air safety
7800-697: The construction of the Kettering Bug by Charles Kettering from Dayton, Ohio and the Hewitt-Sperry Automatic Airplane – initially meant as an uncrewed plane that would carry an explosive payload to a predetermined target. Development continued during World War I, when the Dayton-Wright Airplane Company invented a pilotless aerial torpedo that would explode at a preset time. The film star and model-airplane enthusiast Reginald Denny developed
7900-409: The control of a microcontroller unit (MCU). Flapping-wing ornithopters , imitating birds or insects, have been flown as microUAVs . Their inherent stealth recommends them for spy missions. Sub-1g microUAVs inspired by flies, albeit using a power tether, have been able to "land" on vertical surfaces. Other projects mimic the flight of beetles and other insects. UAV computing capability followed
8000-413: The covariance matrix, the forward-only Capon uses only the forward data vectors to estimate the covariance matrix. The APES (amplitude and phase estimation) method is also a matched-filter-bank method, which assumes that the phase history data is a sum of 2D sinusoids in noise. APES spectral estimator has 2-step filtering interpretation: Empirically, the APES method results in wider spectral peaks than
8100-511: The degree of autonomy in their flight operations. ICAO classifies unmanned aircraft as either remotely piloted aircraft or fully autonomous. Some UAVs offer intermediate degrees of autonomy. For example, a vehicle may be remotely piloted in most contexts but have an autonomous return-to-base operation. Some aircraft types may optionally fly manned or as UAVs, which may include manned aircraft transformed into manned or Optionally Piloted UAVs (OPVs). The flight of UAVs may operate under remote control by
8200-554: The early days of aviation , some being applied to remotely flown target aircraft used for practice firing of a battleship's guns, such as the 1920s Fairey Queen and 1930s de Havilland Queen Bee . Later examples included the Airspeed Queen Wasp and Miles Queen Martinet , before ultimate replacement by the GAF Jindivik . The term remains in common use. In addition to the software, autonomous drones also employ
8300-465: The fact that "radar reflections from discrete objects in a passing radar beam field each [have] a minute Doppler, or speed, shift relative to the antenna". Carl Wiley, working at Goodyear, Arizona, (which later became Goodyear Aerospace, and eventually Lockheed Martin Corporation) in 1951, suggested the principle that — because each object in the radar beam has a slightly different speed relative to
8400-819: The first flight of the RQ-21A Block II. It weighs 121 lb (55 kg) and flew for 2 hours. It was controlled by a new ground control system meant to integrate dissimilar UAV systems. The Block II has the sensor from the Nighteagle, the night version of the ScanEagle , and is designed to operate in high-temperature environments. On 15 May 2013, the Department of the Navy announced that the RQ-21A Integrator received Milestone C approval authorizing
8500-576: The first low-rate production RQ-21A Blackjack began IOT&E for the U.S. Navy and U.S. Marine Corps . Testing was conducted over the next several months to demonstrate its effectiveness in realistic combat conditions. The Navy ordered three Blackjack systems in December 2014. By July 2015, the Navy had received two Blackjack systems. In July 2018, the Marines phased out the RQ-7 Shadow in favor of
8600-477: The first scaled remote piloted vehicle in 1935. Soviet researchers experimented with controlling Tupolev TB-1 bombers remotely in the late 1930s. In 1940, Denny started the Radioplane Company and more models emerged during World War II – used both to train antiaircraft gunners and to fly attack-missions. Nazi Germany produced and used various UAV aircraft during the war, like
8700-539: The loss rate is high, but we are willing to risk more of them ...they save lives!" During the 1973 Yom Kippur War , Soviet-supplied surface-to-air missile -batteries in Egypt and Syria caused heavy damage to Israeli fighter jets . As a result, Israel developed the IAI Scout as the first UAV with real-time surveillance. The images and radar decoys provided by these UAVs helped Israel to completely neutralize
8800-452: The more reliable the target characterization. Multiple captures can be obtained by moving a single antenna to different locations, by placing multiple stationary antennas at different locations, or combinations thereof. The advantage of a single moving antenna is that it can be easily placed in any number of positions to provide any number of monostatic waveforms. For example, an antenna mounted on an airplane takes many captures per second as
8900-521: The need for runways and enables a safe recovery and expeditionary capability for tactical missions on land or sea. At the current testing rate, Initial Operational Capability (IOC) was expected in 2013. On 10 February 2013, the Integrator completed its first at-sea flight from the USS Mesa Verde , a San Antonio -class amphibious transport dock . This followed completing three months of land-based flights. On 19 February 2013, Insitu completed
9000-558: The plane travels. The principal advantages of multiple static antennas are that a moving target can be characterized (assuming the capture electronics are fast enough), that no vehicle or motion machinery is necessary, and that antenna positions need not be derived from other, sometimes unreliable, information. (One problem with SAR aboard an airplane is knowing precise antenna positions as the plane travels). For multiple static antennas, all combinations of monostatic and multistatic radar waveform captures are possible. Note, however, that it
9100-423: The program in 2013, 2014, and 2015. The 2015 report indicates that many of these issues have not been resolved, despite OSD reporting issues in previous years. The 2015 report stated that the RQ-21A was "not operationally effective", "not operationally suitable", that the "system has exploitable cyber security vulnerabilities, and the overall assessment pointed out several major requirements failures. The fielding of
9200-460: The public and media. Also, the relation of UAVs to remote controlled model aircraft is unclear, UAVs may or may not include remote-controlled model aircraft. Some jurisdictions base their definition on size or weight; however, the US FAA defines any unmanned flying craft as a UAV regardless of size. A similar term is remotely piloted aerial vehicle ( RPAV ). UAVs or RPAVs can also be seen as
9300-429: The raw data was recorded on film and the postprocessing by matched filter was implemented optically using lenses of conical, cylindrical and spherical shape. The Range-Doppler algorithm is an example of a more recent approach. Synthetic-aperture radar determines the 3D reflectivity from measured SAR data. It is basically a spectrum estimation, because for a specific cell of an image, the complex-value SAR measurements of
9400-410: The received signals builds a virtual aperture that is much longer than the physical antenna width. That is the source of the term "synthetic aperture," giving it the property of an imaging radar. The range direction is perpendicular to the flight track and perpendicular to the azimuth direction, which is also known as the along-track direction because it is in line with the position of the object within
9500-433: The relative moving track, the backprojection algorithm works very well. It uses the concept of Azimuth Processing in the time domain. For the satellite-ground geometry, GEO-SAR plays a significant role. The procedure of this concept is elaborated as follows. Capon and APES can yield more accurate spectral estimates with much lower sidelobes and more narrow spectral peaks than the fast Fourier transform (FFT) method, which
9600-456: The scene as a set of point targets that do not interact with each other (the Born approximation ). While the details of various SAR algorithms differ, SAR processing in each case is the application of a matched filter to the raw data, for each pixel in the output image, where the matched filter coefficients are the response from a single isolated point target. In the early days of SAR processing,
9700-528: The start of low-rate initial production . With Milestone C approval, the Integrator entered production and deployment. On 12 June 2013, the RQ-21A completed its first East Coast flight from Webster Field Annex, starting the next phase of tests for the Integrator. The UAV was launched with a pneumatic launcher, flew for 1.8 hours, and was recovered with an Insitu-built system known as the STUAS Recovery System (SRS), which allows safe recovery of
9800-538: The term RPAS has been adopted by the Canadian Government to mean "a set of configurable elements consisting of a remotely piloted aircraft, its control station, the command and control links and any other system elements required during flight operation". UAVs may be classified like any other aircraft , according to design configuration such as weight or engine type, maximum flight altitude, degree of operational autonomy, operational role, etc. According to
9900-454: The war at a cost of about 554 UAVs lost to all causes. In the words of USAF General George S. Brown , Commander, Air Force Systems Command , in 1972, "The only reason we need (UAVs) is that we don't want to needlessly expend the man in the cockpit." Later that year, General John C. Meyer , Commander in Chief, Strategic Air Command , stated, "we let the drone do the high-risk flying ...
10000-534: The wind changing after launch, most of the balloons missed their target, and some drifted back over Austrian lines and the launching ship Vulcano . The Spanish engineer Leonardo Torres Quevedo introduced a radio-based control-system called the Telekino at the Paris Academy of Science in 1903, as a way of testing airships without risking human life. Significant development of drones started in
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