基于有理多项式模型的星载高分InSAR影像制作数字高程模型的研究

摘要/Abstract

摘要：

合成孔径雷达干涉测量是一种利用SAR影像复数据的相位信息提取地面三维信息的技术，它通过获取地面目标在两幅SAR影像上的相位差值来解算该点的三维坐标。有理多项式（RPC，Rational Polynomial Coefficient）模型作为一种数学意义上的几何模型，它独立于传感器和平台，简单且具有通用性，可建立地面任意坐标与影像空间的关系。本文在RPC模型用于替代星载SAR的距离多普勒模型和星载InSAR的干涉相位方程基础上，研究 RPC模型应用于星载高分辨率InSAR影像制作DEM的可行性和精度。利用兰州COSMO-SkyMed数据和资源三号三线阵数据制作的DEM为参考数据进行实验验证，RPC模型用于InSAR技术生成的DEM，中误差为7.55米。

关键词: 有理多项式模型（RPC）, 合成孔径雷达干涉测量, 数字高程模型（DEM）

Abstract:

Synthetic aperture radar Interferometry (InSAR) is a new technique by phase data of SAR complex images for extracting the terrain elevation information, which can solve geographic coordinates of ground points by phase difference of two SAR images. RPC model is a mathematical sense of the imaging geometry model, which is independent of the sensor and platform. This model can establish the relationship between the ground coordinates of the image and the corresponding geographic coordinates. At present, some work has been studied about RPC model as a replacement for Range-doppler model and Phase equation, based on that, this paper states how RPC model is applied for DEM generation by InSAR technique, and then RPC model can be used in four steps, coarse registration, subtract flatten phase, phase height conversion and geocoding. Based on the contrast experiment between COSMO-SkyMed SAR images and ZY-3 optical images for lanzhou area, this paper shows that: mean square error of DEM generated by the RPC model applied for InSAR technology is 7.55 meters

Key words: Rational Polynomial Coefficient(RPC), InSAR, Digital Elevation Model(DEM).

中图分类号:

费文波张过唐新明李德仁高小明. 基于有理多项式模型的星载高分InSAR影像制作数字高程模型的研究[J]. 测绘学报, 2014, 43(1): 83-88.

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