A motion errors compensation method based on measured high squinted millimeter wave data

The system of millimeter-wave synthetic aperture radar (SAR) is sensitive to the stability of aircraft, and the compensation of motion errors is the key step for high squint SAR imaging. In this paper, according to the geometric model of the high squint SAR, we analyze the impact of each component of the motion errors for high squint imaging, and deduce the formula of instantaneous Doppler chirp rate. Furthermore, we separate and estimate the motion errors by using the Doppler chirp rate and the parameters of inertial navigation system, and then we utilize the motion errors and the high squint SAR imaging algorithm to correct the errors and obtain the new SAR images. The imaging results based on the measured millimeter wave data show that the motion errors compensation algorithm for high squint SAR imaging achieves a good imaging performance.