Abstract:

This paper focuses on the range echo modulation for the space target imaging on the space-borne radar. A range compression algorithm of high precision is proposed through analysis on relationship between the high-speed stationary target and the space-borne radar, which uses the fractional Fourier transform (FrFT) and polynomial fitting. FrFT is applied to implement the range compression of some de-chirped echoes and polynomial fitting is utilized to acquire the radial velocity varying with the slow-time. Accordingly the precise rotation angel is obtained for range compression. Compared with the traditional inverse synthetic aperture radar (ISAR) range compression method, the proposed algorithm accomplishes the range compression with high precision, and enhances the quality of imaging. The numeric simulations testify the feasibility of the algorithm.