摘要
传统干涉合成孔径雷达InSAR系统在获取高程数据过程中,通常需要利用场景中至少一点的高程信息获取绝对模糊数,为无控制点区域高程数据获取带来一定困难。为解决该问题,提出一种InSAR系统中基于双频的绝对模糊数求解方法。该方法在不同频点上分别获取同一区域的一对干涉相位图,通过二维遍历搜索获取绝对模糊数。在简要介绍星载双频系统及工作方式基础上,给出双频InSAR系统绝对相位模糊数求解公式,对双频的频差要求进行分析,仿真数据验证了该方法的正确性和可行性。
In the process of acquiring elevation data in traditional InSAR, the absolute ambiguity number is obtained using at least one point elevation information in the scene. It brings certain difficulties to the acquisition of elevation data in uncontrolled areas. To solve the problem, a method for solving absolute ambiguity numbers based on dual-frequency InSAR system is presented in this paper. A pair of interferograms of the same region at different frequencies is obtained in this method, and the absolute ambiguity numbers are obtained on the using of 2 D searching approach. Based on the brief introduction of the spaceborne dual-frequency system and its working mechanisms, a formula for solving the dual-frequency InSAR absolute phase-ambiguity number is proposed. The frequency difference requirement of dual frequency is analyzed, and the correctness and feasibility of the proposed method are verified by simulation.
作者
楼屹杉
楼嘉晗
LOU Yishan;LOU Jiahan(School of Electronic Engineering, Xidian University, Xif an 710071, China)
出处
《测绘科学技术学报》
CSCD
北大核心
2018年第4期400-404,共5页
Journal of Geomatics Science and Technology
关键词
干涉合成孔径雷达
双频
干涉相位
模糊数
星载
InSAR
dual-frequency
interferometric phase
ambiguity number
spaceborne
