Abstract

The chirp scaling algorithm (CSA) is considered as an efficient SAR imaging algorithm. The existence of the range-uncompressed chirp is the necessary condition for CSA to be used. However, if the range chirp is large in the high squint angle case, there will be a strong coupling between the range chirp and azimuth frequency. This coupling will render the relationship between range curvature and Doppler frequency non-linear and hence make the CSA lose its precision in such a case. An analysis about this coupling effect and a compensating method are given in this paper. Computer simulation has confirmed the coupling effect. A possible solution to this problem is also mentioned.

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