Advanced Synthetic Aperture Radar
|Within Vocab||SeaVoX Device Catalogue|
|Definition||A radio-occultation imaging radar designed to capture imagery of ocean, land and ice at high resolution and independently of weather conditions. The instrument operates as an active remote sensing device, emitting microwave pulses in the C-band frequency range (2 GHz - 4 GHz) and recording the response reflected by the Earth's surface targeted. The time it takes for each emitted pulse to return to the instrument holds information on the distance of the target object, whilst the amount of the signal returned is used to extract information on surface properties. ASAR operates in five mutually exclusive modes, which output images of different sizes and spatial resolution. The instrument is able to create orthogonal polarised waves, the return signal of which can be used to extract information on the type of surface targeted. The user can select an operating mode out of five mutually exclusive options: the Image mode (IM), generating products at a spatial resolution of 30 m over one of seven selectable swath widths determined by incidence angles between 15 degrees to 45 degrees, at horizontal transmit and receive polarisation (HH) or vertical transmit and receive polarisation (VV); the Alternating Polarisation mode (AP), generating products at a spatial resolution of 30 m over one of seven selectable swath widths determined by incidence angles between 15 degrees to 45 degrees, at different dual polarisation combinations (HH/VV or HH/HV or VV/VH); the Wide Swath mode (WS), which uses the ScanSAR technique, thus providing images at 150 m resolution over five combined sub-swaths covering a total of 405 km, in HH or VV polarisation; the Global Monitoring mode (GM), outputting 1 km resolution images over a 405 km swath, in HH or VV polarisation; and the Wave mode (WV), which generates backscatter vignettes of 5 km by 5 km size, spaced 100 km along track in HH or VV polarisation. Flown on Envisat. http://www.wmo-sat.info/oscar/instruments/view/44|
|Has Current Version||1|
||synthetic aperture radars||Mapping: 877856|
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