Application of radar which is used to create two-dimensional images
Not to be confused with Radar display.
A SAR radar image acquired by the SIR-C/X-SAR radar on board the Space Shuttle Endeavour shows the Teide volcano. The city of Santa Cruz de Tenerife is visible as the purple and white area on the lower right edge of the island. Lava flows at the summit crater appear in shades of green and brown, while vegetation zones appear as areas of purple, green and yellow on the volcano's flanks.
Imaging radar is an application of radar which is used to create two-dimensional images, typically of landscapes. Imaging radar provides its light to illuminate an area on the ground and take a picture at radio wavelengths. It uses an antenna and digital computer storage to record its images. In a radar image, one can see only the energy that was reflected back towards the radar antenna. The radar moves along a flight path and the area illuminated by the radar, or footprint, is moved along the surface in a swath, building the image as it does so.[1]
Digital radar images are composed of many dots. Each pixel in the radar image represents the radar backscatter for that area on the ground (terrain return): brighter areas represent high backscatter, darker areas represents low backscatter.[1]
The traditional application of radar is to display the position and motion of typically highly reflective objects (such as aircraft or ships) by sending out a radiowave signal, and then detecting the direction and delay of the reflected signal. Imaging radar on the other hand attempts to form an image of one object (e.g. a landscape) by furthermore registering the intensity of the reflected signal to determine the amount of scattering. The registered electromagnetic scattering is then mapped onto a two-dimensional plane, with points with a higher reflectivity getting assigned usually a brighter color, thus creating an image.
Several techniques have evolved to do this. Generally they take advantage of the Doppler effect caused by the rotation or other motion of the object and by the changing view of the object brought about by the relative motion between the object and the back-scatter that is perceived by the radar of the object (typically, a plane) flying over the earth. Through recent improvements of the techniques, radar imaging is getting more accurate. Imaging radar has been used to map the Earth, other planets, asteroids, other celestial objects and to categorize targets for military systems.
^ ab"What is imaging radar ?/jpl". southport.jpl.nasa.gov. Archived from the original on 2016-11-18. Retrieved 2015-12-09.
Spaceborne ImagingRadar (SIR) – full name 'Spaceborne ImagingRadar-C/X-band Synthetic Aperture Radar (SIR-C/X-SAR)', is a synthetic aperture radar which...
Molecular imagingRadarimaging, or imagingradar, for obtaining an image of an object, not just its location and speed Range imaging, for obtaining images with...
investigates the subsurface of a terrestrial planet. Geophysical imaging is a noninvasive imaging technique with a high parametrical and spatio-temporal resolution...
buildings. Improving the resolution of an imagingradar requires that the antenna size is many times that of the radar wavelength. Wavelength is inversely proportional...
Venus Orbiting ImagingRadar (VOIR; also called Venus Orbital ImagingRadar) was a planned 1983 U.S. spacecraft mission to Venus that was primarily intended...
The Tracking & ImagingRadar (TIRA) system serves as the central experimental facility for the development and investigation of radar techniques for the...
receiving). The result is a more detailed image than would have been rendered with just one radar instrument. Bistatic imaging can be useful in differentiating...
Vayyar Imaging Ltd. (Hebrew: ואיאר הדמאה בע"מ) is an Israeli semiconductor company that produces 4D imagingradar sensors. Initially developed to provide...
Side-looking airborne radar (SLAR) is an aircraft- or satellite-mounted imagingradar pointing perpendicular to the direction of flight (hence side-looking)...
image. Through-the-wall radars can be made with Ultra Wideband impulse radar, micro-Doppler radar, and synthetic aperture radar (SAR). Imagingradar 3D...
Divyachakshu (Divyachakshu: Divine Eye) is a through barrier imagingradar, developed by Electronics and Radar Development Establishment (LRDE), a Bengaluru-based...
ship, including overlays of satellite imaging. As required by COLREGS, all ships shall maintain a proper radar lookout if it is available on board to...
It is known as the Haystack Long-Range ImagingRadar (LRIR) or Haystack Ultrawideband Satellite ImagingRadar (HUSIR) when used for the LSSC. It was constructed...
Weather radar, also called weather surveillance radar (WSR) and Doppler weather radar, is a type of radar used to locate precipitation, calculate its...
an image which is better than unaided human vision. An EFVS includes imaging sensors (one or many) such as a color camera, infrared camera or radar, and...
The radar system was based on the older Spaceborne ImagingRadar-C/X-band Synthetic Aperture Radar (SIR-C/X-SAR), previously used on the Shuttle in 1994...
use is called spectroradiometer in lab and imaging spectrometer or multi-/ hyper-spectral scanner as imaging remote sensors. Provided that the land is...
identification and reconnaissance. Early space-based imaging platforms incorporated multispectral imaging technology to map details of the Earth related to...
based active electronically scanned array (AESA) radar under development by the Electronics and Radar Development Establishment (LRDE), a laboratory of...
Global Information