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Motion compensation for airborne SAR

To obtain a high resolution image from an airborne synthetic aperture radar (SAR), it is essential that accurate motion compensation be applied to the radar returns to reduce image degradation, caused by spurious motion of antenna phase center (APC), to an acceptable level. This paper describes a new SAR motion compensation system (SARMCS), which includes a airplane MINS (master inertial navigation system) and a GPS receiver located near the mass center of the aircraft, a slaved low cost strapdown IMU (inertial measurement unit) mounted on the antenna structure. The performance requirements of the SARMC are described, the configuration of SARMCS itself is outlined, and finally simulation results are given.