Parameter estimation using a frequency domain least square approach for spaceborne SAR data
Тао Чен, Yongfei Ding, Ruifan Pang, Cheng Gong, Dinghai Xu, Hengyang Zhang · 2016
A frequency domain least square approach is proposed to estimate Doppler parameters of Synthetic Aperture Radars (SAR). The estimator includes Doppler centroid and Doppler frequency rate. Power Spectrum Density (PSD) of radar echoes is derived from spaceborne SAR data. Doppler centroid and Doppler frequency are obtained by minimizing the Euclidian distance of PSD between analytic form and data. Instead of extensive search, an iterative algorithm based on steep descent method is developed. Simulation and experimental results demonstrate the accurate performance.