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Synthetic Aperture Radar
Synthetic Aperture Radar (SAR) is a technology used on aircraft or satellites to create highly detailed images of the Earth's surface. It works by sending out radar signals and then using the motion of the platform to simulate a much larger antenna, allowing it to see clearly through clouds, darkness, and bad weather.
TECHNICAL DEFINITION
Synthetic Aperture Radar (SAR) is an active remote sensing and ISR technology that utilizes a moving radar platform (e.g., aircraft, satellite, drone) and advanced signal processing to synthesize a large antenna aperture, generating high-resolution, two- or three-dimensional imagery of terrain and objects. SAR provides all-weather, day-night imaging capabilities by transmitting microwave pulses and analyzing the phase and amplitude of the backscattered signals, enabling applications in intelligence, surveillance, reconnaissance, and targeting.
BACKGROUND
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 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. 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. 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 a range of viewing distances.
READ MORE ON WIKIPEDIASYNONYMS & ALIASES
- SAR
- aperture synthesis radar
- SAR imaging
- high-resolution radar imaging
- coherent side-looking radar
- all-weather imaging radar
USAGE NOTE
SAR is prized in military operations for its ability to conduct persistent surveillance and change detection in denied areas, regardless of weather conditions.
DEVELOPERS
Organizations developing technology related to Synthetic Aperture Radar.
A leading global security company that designs, develops, and produces advanced radar systems, including the AN/ZPY-2 Multi-Platform Radar Technology Insertion Program (MP-RTIP) and STARLite wide-area surveillance SAR for various airborne platforms.
A major defense contractor that develops a wide array of sophisticated sensor systems. They produce the Advanced Synthetic Aperture Radar System (ASARS-2) for the U-2 reconnaissance aircraft and integrate SAR modes into their fighter jet radars.
An aerospace and defense technology company that provides advanced ISR solutions. They develop and integrate compact, high-performance SAR payloads for a variety of platforms, including unmanned aerial vehicles (UAVs) and crewed aircraft.
The primary manufacturer of remotely piloted aircraft systems like the Predator and Reaper drones. They also develop the sensor payloads, including the Lynx Multi-mode Radar, a high-performance SAR/GMTI system integrated on their platforms.
A global aerospace and security company that develops advanced radar systems with SAR capabilities, such as the AN/APG-81 AESA radar for the F-35 fighter jet, as well as space-based SAR concepts for persistent surveillance.
A U.S. Department of Energy national laboratory that conducts extensive research and development in SAR technology for national security purposes. They are known for creating miniaturized SAR (MiniSAR) systems and advanced data processing techniques.
A federally funded research and development center (FFRDC) that has pioneered many advanced radar technologies. Their work includes foliage-penetrating (FOPEN) SAR, video SAR, and novel algorithms for defense and intelligence applications.
A commercial satellite company that operates a constellation of satellites providing very high-resolution SAR imagery. Their technology has significant dual-use applications and is used by various government and defense agencies for intelligence and monitoring.
A company that owns and operates the world's largest constellation of SAR satellites. They provide persistent monitoring capabilities and near real-time data to government, defense, and intelligence clients for applications like maritime domain awareness and border security.