现有InSAR参数定标都是基于定标器的绝对高程，因此定标器的绝对高程测量精度是影响参数定标精度的重要因素之一。绝对高程测量方法受各种因素的影响，高精度测量的成本高、难度大，但视距内的定标器高程差测量相对容易、成本低、精度高，因此本文提出了利用定标器高程差进行参数定标的算法，不仅避免了定标器绝对高程的高精度测量问题，还能改善定标敏感度矩阵的病态性，并针对此方法给出了定标器的布放规则。仿真结果证明了该方法的有效性，同时重建出精确的相对地形高程。

Conventional parameter calibration algorithms for InSAR system are based on calibrators’ absolute height, so absolute height error is a key factor that influences the calibration results. Since current height measurements are affected by reference horizon and measure environment, accurate measurement is much more costing and difficult, but accurate height difference of calibrators within sight is much easier to measure with low cost, so calibrators’ height differences are used to calibrate system parameters in this paper. It not only avoids the measurement of calibrators’ absolute height, but also reduces the condition number of sensitivity matrix. Basic criteria for locating calibrators are also given. The simulation results show the effectiveness of this calibration method, and also reconstruct an accurate relative height terrain.