Abstract
Ambiguity phenomenon appears in all spaceborne SAR, and degrades their image qualities. Ambiguity to signal ratio(ASR) is an important parameter for evaluating the performance of spaceborne SAR system. Accurate ASR estimate is essential for system design. In conventional ambiguity analysis methods, the antenna gain of ambiguity signal just is considered in two main section planes of the pattern. It results in computation error. This paper proposes a precise ambiguity analysis method. It starts off by analyzing ambiguity principium, and considers accurate ambiguity position in three dimensions antenna pattern and pattern change with time and scanning angle. Besides, the method adequately considers the ambiguity position change with PRF. So, it adapts to the new SAR mode with varying PRF, such as staggered SAR.
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