Ka-band Radar Interferometer (KaRIn)

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The Ka-band Radar Interferometer (KaRIn) is an altimeter used to measure surface heights. Aboard NASA’s Soil Moisture Active Passive (SMAP) satellite, KaRIn measures ocean and surface water levels. KaRIn is a near-nadir (1-4° look angles) swath-based instrument measuring the highly reflective water surface. The look angles at the altitude of the satellite enable swath coverage of about 120 km (from 10 to 70 km in cross-track distance on both sides of the nadir track). The instrument acquires measurements at Ka-band (35.75 GHz) with two Ka-band synthetic aperture radar (SAR) antennae at opposite ends of a 10-m boom. The KaRin instrument consists of the KaRIn Digital Electronics Subsystem (KDES), the Radio Frequency Unit (RFU), the High Power Amplifier (HPA), and the Deployable Antenna Assembly.

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