Two-pass spaceborne interferometric SAR is used to produce three-dimensional terrain map by estimating the unwrapped interferometric phase and transferring the phase into terrain height.Baseline is very important for spaceborne interferometric SAR system design and data processing.In this paper

spatial baseline in spaceborne interferometric SAR was analyzed in many aspects.The statistical correlation between two SAR images from different satellite passes was presented.Influences of baseline on range flat ground frequency and multilook processing were discussed.The equation to determine the optimal spatial baseline was deduced.Finally

the results of computer simulating were presented to testify the correction of analysis.