An azimuth weighting method of slide-spotlight SAR based on subaperture chirp scaling algorithm

Different azimuth targets have different Doppler centroid and different time support domain in slide spotlight synthetic aperture radar. Thus, it is hard to weighting window on the echo in slide spotlight mode. This paper proposed an azimuth weighting method of slide spotlight SAR based on subaperture chirp scaling algorithm. Firstly, the subaperture number of the algorithm is discussed based on the shift of Doppler centroid and the pulse repetition frequency(PRF). Secondly, the range cell migration and the remove of the azimuth phase of each subaperture are processed by chirp scaling algorithm independently. At last, the data of each subaperture is combined together, and the azimuth weighting window is applied after an azimuth de-ramp process of the combined data. The computer simulations verify the validity of the proposed algorithm.