GEOSat Follow-On Radar Altimeter
|SeaVoX Device Catalogue
|A radio-occultation radar altimeter designed for ocean topography, significant wave height, and sea surface wind speed observations. A digital chirp generator produces a pulse, which is up-converted in a frequency multiplier, amplified by a power amplifier and routed to the antenna by a T/R switch; the same switch directs the return signal to the receiver, which transforms range separation into frequency separation to allow sampling using Fourier Transform techniques. The receiver carries out automatic gain control (AGC) and down-converts the return signal. GFO-RA performs continuous sampling along the sub-track (nadir-only viewing), and it is supported by a microwave radiometer (MWR) for atmospheric correction. Radar cross section and height are calibrated on board. The instrument only detects at Ku-band frequency centred at 13.5 GHz. The resolution is 25 km at sub-satellite point. The pulse-limited footprint is 2 km along the sub-track. Flown on GFO. http://www.wmo-sat.info/oscar/instruments/view/154
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