WSynthetic-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 beam-scanning radars. SAR is typically mounted on 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 in the time taken for the radar pulses to return to the antenna creates the large synthetic antenna aperture. Typically, the larger the aperture, the higher the image resolution will be, regardless of whether the aperture is physical or synthetic – this allows SAR to create high-resolution images with comparatively small physical antennas. Additionally, SAR has the property of having larger apertures for more distant objects, allowing consistent spatial resolution over a range of viewing distances.
WAdvanced Tactical Airborne Reconnaissance System (ATARS) is a system for image acquisition, data storage, and data link used by the United States Marine Corps on its F/A-18D Hornet aircraft. It consists of the Advanced Tactical Airborne Reconnaissance System (ATARS) with infrared and visible light sensors, two digital tape recorders, and a Reconnaissance Management System (RMS); an interface with the APG-73 Radar Upgrade which records synthetic aperture radar (SAR) imagery; and a digital data link mounted in a centerline pod. ATARS fits in the nose in place of the nose gun, with a small datalink pod mounted on the centerline station. The digital data link will transmit imagery and auxiliary data to any Common Imaging Ground/Surface Station (CIG/SS) compatible system including the Joint Services Imagery Processing System (JSIPS) or Marine Tactical Exploitation Group (TEG) based ashore and Navy JSIPS (JSIPS-N) aboard ship.
WThe AN/APG-68 radar is a long range Pulse-doppler radar designed by Westinghouse to replace AN/APG-66 radar in the F-16 Fighting Falcon. The AN/APG-68(V)8 and earlier radar system consists of the following line-replaceable units:Antenna Dual Mode Transmitter (DMT) Modular Low-power radio frequency (MLPRF) Programmable signal processor (PSP)
WThe Bateleur is an unmanned aerial vehicle (UAV) prototype designed and built by Denel Dynamics. It has been designed as a MALE UAV, with its primary role being surveillance, with a secondary signals intelligence capability.
WThe Dong-Feng 21 (DF-21; NATO reporting name CSS-5 - Dong-Feng is a two-stage, solid-fuel rocket, single-warhead medium-range ballistic missile in the Dong Feng series developed by China Changfeng Mechanics and Electronics Technology Academy. Development started in the late 1960s and was completed around 1985–86, but it was not deployed until 1991. It was developed from the submarine-launched JL-1 missile, and is China's first solid-fuel land-based missile. The U.S. Department of Defense in 2008 estimated that China had 60-80 missiles and 60 launchers; approximately 10-11 missiles can be built annually.
WThe Dong-Feng 26 is an intermediate-range ballistic missile deployed by the People's Liberation Army Rocket Force and produced by the China Aerospace Science and Technology Corporation (CASC).
WThe General Atomics Avenger is a developmental unmanned combat air vehicle built by General Atomics Aeronautical Systems for the U.S. military.
WInterferometric synthetic aperture radar, abbreviated InSAR, is a radar technique used in geodesy and remote sensing. This geodetic method uses two or more synthetic aperture radar (SAR) images to generate maps of surface deformation or digital elevation, using differences in the phase of the waves returning to the satellite or aircraft. The technique can potentially measure millimetre-scale changes in deformation over spans of days to years. It has applications for geophysical monitoring of natural hazards, for example earthquakes, volcanoes and landslides, and in structural engineering, in particular monitoring of subsidence and structural stability.
WFuk K. Li (李復國) is the Director of the Mars Exploration Directorate at NASA's Jet Propulsion Laboratory.
WThe General Atomics MQ-1 Predator is an American remotely piloted aircraft (RPA) built by General Atomics that was used primarily by the United States Air Force (USAF) and Central Intelligence Agency (CIA). Initially conceived in the early 1990s for aerial reconnaissance and forward observation roles, the Predator carries cameras and other sensors. It was modified and upgraded to carry and fire two AGM-114 Hellfire missiles or other munitions. The aircraft entered service in 1995, and saw combat in the war in Afghanistan, Pakistan, the NATO intervention in Bosnia, Serbia, the Iraq War, Yemen, the 2011 Libyan civil war, the 2014 intervention in Syria, and Somalia.
WThe General Atomics MQ-9 Reaper is an unmanned aerial vehicle (UAV) capable of remotely controlled or autonomous flight operations developed by General Atomics Aeronautical Systems (GA-ASI) primarily for the United States Air Force (USAF). The MQ-9 and other UAVs are referred to as Remotely Piloted Vehicles/Aircraft (RPV/RPA) by the USAF to indicate their human ground controllers.
WThe Northrop Grumman RQ-4 Global Hawk is a high-altitude, remotely-piloted, surveillance aircraft. It was initially designed by Ryan Aeronautical, and known as Tier II+ during development. The Global Hawk performs duties similar to that of the Lockheed U-2. The RQ-4 provides a broad overview and systematic surveillance using high-resolution synthetic aperture radar (SAR) and long-range electro-optical/infrared (EO/IR) sensors with long loiter times over target areas. It can survey as much as 40,000 square miles (100,000 km2) of terrain a day, an area the size of South Korea or Iceland.
WThe OC-135B Open Skies United States Air Force observation aircraft supports the Treaty on Open Skies. The aircraft, a modified WC-135B, flies unarmed observation flights over participating parties of the treaty. Three OC-135B aircraft were modified by the Aeronautical Systems Center's 4950th Test Wing at Wright-Patterson Air Force Base in Ohio. The first operationally-capable OC-135B was assigned to the 24th Reconnaissance Squadron at Offutt AFB in October 1993. It is now fitted with a basic set of navigational and sensor equipment, and was placed in inviolate storage at the Aerospace Maintenance and Regeneration Center at Davis-Monthan Air Force Base near Tucson, Arizona in 1997. Two fully operational OC-135B aircraft were delivered in 1996 with the full complement of treaty-allowed sensors, which includes an infrared line scanner, synthetic aperture radar and video scanning sensors.
WOpticks is a remote sensing application that supports imagery, video, synthetic aperture radar (SAR), multi-spectral, hyper-spectral, and other types of remote sensing data. Opticks supports processing remote sensing video in the same manner as it supports imagery, which differentiates it from other remote sensing applications. Opticks was initially developed by Ball Aerospace & Technologies Corp. and other organizations for the United States Intelligence Community. Ball Aerospace open sourced Opticks hoping to increase the demand for remote sensing data and broaden the features available in existing remote sensing software. The Opticks software and its extensions are developed by over twenty different organizations, and over two hundred users are registered users at http://opticks.org. Future planned enhancements include adding the ability to ingest and visualize lidar data, as well as a three-dimensional (3-D) visualization capability.
WA pulse-Doppler radar is a radar system that determines the range to a target using pulse-timing techniques, and uses the Doppler effect of the returned signal to determine the target object's velocity. It combines the features of pulse radars and continuous-wave radars, which were formerly separate due to the complexity of the electronics.
WThe Falco is a tactical unmanned aerial vehicle (UAV) designed and produced by Selex ES. The UAV is designed to be a medium-altitude, medium-endurance surveillance platform capable of carrying a range of payloads, including several types of high-resolution sensors. A larger variant, the Falco EVO, is capable of carrying larger payloads is also available. Neither system is designed to carry weapons, The launch customer, Pakistan, reportedly wanted the Falco armed, a request that Italy rejected.
WSide-looking airborne radar (SLAR) is an aircraft- or satellite-mounted imaging radar pointing perpendicular to the direction of flight. A squinted (nonperpendicular) mode is possible also. SLAR can be fitted with a standard antenna or an antenna using synthetic aperture.
WSpace-based radar is space-borne radar systems that may have any of a variety of purposes. A number of Earth-observing radar satellites, such as RADARSAT, have employed synthetic aperture radar (SAR) to obtain terrain and land-cover information about the Earth.
WSynthetic aperture sonar (SAS) is a form of sonar in which sophisticated post-processing of sonar data is used in ways closely analogous to synthetic aperture radar. Synthetic aperture sonars combine a number of acoustic pings to form an image with much higher along-track resolution than conventional sonars. The along-track resolution can approach half the length of one sonar element, though is downward limited by 1/4 wavelength. The principle of synthetic aperture sonar is to move the sonar while illuminating the same spot on the sea floor with several pings. When moving along a straight line, those pings that have the image position within the beamwidth constitute the synthetic array. By coherent reorganization of the data from all the pings, a synthetic aperture image is produced with improved along-track resolution. In contrast to conventional side-scan sonar, SAS processing provides range-independent along-track resolution. At maximum range the resolution can be magnitudes better than that of side-scan sonars.
WThe TAI Anka is a family of unmanned aerial vehicles (UAV) developed by Turkish Aerospace Industries (TAI) for the Turkish Armed Forces. The first version, Anka-A, was classified as a medium-altitude long-endurance unmanned aerial vehicle. Envisioned in the early 2000s for tactical surveillance and reconnaissance missions, further versions evolved into a modular platform with synthetic aperture radar, precise weapons and satellite communication. The drone is named after phoenix, a mythological creature also called Zümrüd-ü Anka in Turkish.