Baseline correction method of Lutan-1 for topographic mapping with and without control
In the process of generating digital surface models ( DSM ) using interferometric synthetic aperture radar ( InSAR ),centimeter level baseline error will lead to meter level height error. For the Lutan-1( LT-1) topography mapping mission,an InSAR DSM generation method without control based on far and near beams baseline calibration is proposed in this article. This method obtain accurate baseline correction parameter with calibration sites,and applies the baseline correction parameter to other LT-1 bistatic data in Datong,reducing the mean square error of height by 0.98 m. Meanwhile,we compare and analyze this method with traditional baseline estimation methods assisted by control points. The results show that the baseline correction parameter obtained by baseline estimation method assisted by control points is not applicable to other LT-1 data,while the method in this paper can be robustly used for high-precision DSM generation in long-term and large areas,providing technical support for InSAR topography mapping mission.
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