Deriving bistatic chirp scaling algorithm based on the signal model

This paper provides a novel view on the chirp scaling algorithm. In this new way, the chirp scaling algorithm is analyzed through its range-Doppler (RD) expression first. The RD expression can be modeled with three basic functions. The different functions can be derived by the different methods. The proposed method can reduce the approximating error of the bistatic azimuth modulation and can produce the close-form bistatic range curvature factor. Though this paper´s algorithm is derived under the azimuth-invariant bistatic framework, the proposed methodology can be extended into the general case.