CAJ | 학술논문

机载差分干涉SAR (D-InSAR)是一种极具潜力的地表形变监测技术，该文对该技术中经常使用的双轨法和三轨法两种工作模式的误差进行了比较分析。分析过程中根据互相独立的原则对各种误差进行分解和归类，并且考虑了运动误差与其它误差因素之间的耦合关系，在此基础上推导出两种工作模式下形变测量误差的解析表达式。结果表明：当运动误差幅度较小的时候，三轨法可以降低对外部地形数据的要求，相对于双轨法，它的优势非常显著；当运动误差幅度较大的时候，三轨法需要使用高精度的地形数据，它相对于双轨法的优势就不再明显。
궤재차분간섭SAR (D-InSAR)시일충겁구잠력적지표형변감측기술，해문대해기술중경상사용적쌍궤법화삼궤법량충공작모식적오차진행료비교분석。분석과정중근거호상독립적원칙대각충오차진행분해화귀류，병차고필료운동오차여기타오차인소지간적우합관계，재차기출상추도출량충공작모식하형변측량오차적해석표체식。결과표명：당운동오차폭도교소적시후，삼궤법가이강저대외부지형수거적요구，상대우쌍궤법，타적우세비상현저；당운동오차폭도교대적시후，삼궤법수요사용고정도적지형수거，타상대우쌍궤법적우세취불재명현。
Airborne Differential Synthetic Aperture Radar Interferometry (D-InSAR) is a kind of potential technology to survey the surface deformation. In this paper, the errors of two usually used modes of this technology, namely, two-pass and three-pass approaches, are compared and analyzed. In the analysis, all the errors are decomposed and sorted according to the principle of independence, and the coupling between motion error and other errors is considered. Based on the analysis, analytical expressions are derived for the deformation measurement errors in the two modes. The results demonstrate that when the amplitude of the motion error is small, the three-pass approach can reduce the requirement on the precision of the external topography data, so it distinctly outperforms the two-pass approach; when the amplitude of the motion error is large, high-precision topography data are needed in the three-pass approach, and as a result, its advantage over the two-pass approach is not distinct any more.