Phased Array type L-band Synthetic Aperture Radar
|Within Vocab||SeaVoX Device Catalogue|
|Preferred Label||Phased Array type L-band Synthetic Aperture Radar|
|Definition||The Phased Array type L-band Synthetic Aperture Radar (PALSAR) is an active microwave sensor using L-band frequency to achieve high resolution cloud-free, day-and-night land observation, all-weather soil moisture observation and ocean surface features observation. PALSAR can observe in three different modes; fine-resolution mode, a secondary ScanSAR (burst mode SAR) observation mode for monitoring sea-ice and rainforest extent, and Polarimetric mode for receiving simultaneous horizontal and vertical polarisation (multi-polarimetry). PALSAR transmits successive pulses of radio waves to illuminate the target scene, and the echo of each pulse is received and recorded via an array of side-viewing beam-forming antennae. All elements of these arrays receive echos simultaneously in real time so the signals passing through them are individually subjected to controlled shifts of the phases of those signals. Signal processing of the successive recorded radar echoes allows the combining of the recordings from these multiple antenna positions to produce a high-resolution image. PALSAR has a centre frequency of 1270 MHz (L-band). In fine resolution mode, the swath width ranges from 40-70 km and a resolution of 7 - 44 m. In ScanSAR mode, the swath width ranges from 250 350 km with a 100 m multi-look resolution. In polarimetric mode, the swath width ranges from 20 - 65 km with a spatial resolution of 24 - 89 m. Radiometric accuracy of the scene is 1 dB. Flown on ALOS. https://earth.esa.int/web/guest/missions/3rd-party-missions/historical-missions/alos/instruments/palsar|
|Authored On||2016-11-15 14:35:44|
|Is Version Of||http://vocab.nerc.ac.uk/collection/L22/current/TOOL1041/|
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