车载双天线干涉SAR DEM提取方法

doi:10.11947/j.AGCS.2020.20200001

摘要/Abstract

摘要： 相对于星载和机载SAR而言，使用车载SAR数据提取DEM可有效缩短DEM数据更新周期，降低成本。由于车载SAR平台结构可变，干涉定标需要重复进行，本文提出了基于单控制点的车载双天线干涉SAR的DEM提取方法。该方法基于单个控制点的精确坐标信息进行相位、斜距和高程改正，并实现高程的迭代求解，无需布设大量控制点进行干涉定标，有效简化外业工作。仿真试验证明：当基线长度估计达到毫米级精度，基线倾角估计也达到较高的精度时，可保证该方法较高的DEM提取精度。利用2018年在湖北武汉地区获取的车载双天线干涉SAR数据使用该方法和基于干涉定标的多控制点方法进行DEM提取对比试验，结果表明该方法在检查点的高程中误差为0.301 8 m，多控制点方法为0.258 4 m，在高相干区域，两种方法的DEM结果具有高度的统一性。

关键词: 车载, 双天线, SAR, DEM, 干涉定标, 单控制点

Abstract: Compared with spaceborne and airborne SAR, DEM extraction using vehicle-mounted SAR data can effectively shorten the update cycle of DEM data and reduce the cost. Due to the variable structure of vehicle-mounted SAR platform, interferometric calibration needs to be repeated, this paper proposes a DEM extraction method of vehicle-mounted interferometric SAR with dual antennas based on a single control point. This method corrects the phase, slope distance and elevation based on the precise coordinate information of a control point and realizes the iterative solution of elevation. It does not need to set up many control points for interferometric calibration, effectively simplifying the field work. The simulation results show that high accuracy of DEM extraction can be guaranteed when the estimation of baseline length reaches the accuracy of mm and the estimation of baseline inclination also reaches a high accuracy. Using vehicle-mounted interferometric SAR data with dual antennas obtained in wuhan, hubei province in 2018,the comparative test of DEM extraction was carried out using this method and multiple control point method based on interferometric calibration. The results show that the elevation error of this method at the checkpoints is 0.301 8 m, and multiple control point method is 0.258 4 m, the DEM results of two methods are highly consistent in the areas with high coherence.

Key words: vehicle-mounted, dual antennas, SAR, DEM, interferometric calibration, single control point

中图分类号:

P227

戴国梦, 潘斌, 刘磊. 车载双天线干涉SAR DEM提取方法[J]. 测绘学报, 2020, 49(12): 1609-1618.

DAI Guomeng, PAN Bin, LIU Lei. A DEM extraction method for vehicle-mounted interferometric SAR with dual antennas[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(12): 1609-1618.

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