直接地理编码与星载干涉SAR测高不确定度的等效性分析

徐华平; 康昌辉; 周荫清

doi:10.3724/SP.J.1146.2008.01470

直接地理编码与星载干涉SAR测高不确定度的等效性分析

doi: 10.3724/SP.J.1146.2008.01470

计量
- 文章访问数: 3621
- HTML全文浏览量: 95
- PDF下载量: 823
- 被引次数: 0
出版历程
- 收稿日期: 2008-11-07
- 修回日期: 2009-10-09
- 刊出日期: 2010-01-19

The Equivalent Analysis of Direct Geocoding Model and Spaceborne INSAR Altitude Model in Height Uncertainty

摘要

摘要: 现有的考虑地球曲率影响的INSAR测高模型主要有星载干涉SAR测高模型和直接地理编码两种。星载干涉SAR测高模型首先利用SAR干涉获取非模糊干涉相位，然后根据考虑地球曲率的空间几何关系直接计算地形高度。而直接地理编码模型则是在SAR干涉获取非模糊干涉相位的基础上，利用两个斜距方程和一个多普勒方程给出地面点的3维坐标值。由于两种模型得到地形高程的途径不同，因此很难直接比较这两种模型的地形测高不确定度。该文在采用矩阵形式推导出直接地理编码模型地形高程不确定度显示表达式的基础上，通过引入斜距平面坐标系，定量化地证明了直接地理编码模型的高程测量不确定度公式与考虑地球曲率的SAR干涉测高模型的测高不确定度公式是相同的，从而说明了这两种模型在用于地形高程测量时具有相同的精度。最后采用计算机仿真验证了理论分析的正确性。
- SAR; 干涉; 测高模型; 不确定度分析
Abstract: The height measurement models considering earth curvature of INSAR mainly consist of two kinds- spaceborne interferometric SAR height measurement model and direct geocoding model. Spaceborne interferometric SAR height measurement model gets unambiguous interferometric phases through interferometric SAR, then calculates the terrain height by the spatial geometry considering earth curvature. Direct geocoding model obtains the three-dimensional coordinates using two slant range equations and one Doppler equation, based on the unambiguous interferometric phases. Because the methods getting the terrain height in the two models are different, it is difficult to compare the height measurement uncertainties of the models. Based on matrix theory, the explicit expressions of height uncertainty of direct gecoding model are presented. And it is proven that the height measurement uncertainty formulas of direct geocoding model are the same as that of spaceborne interferometric SAR height measurement model after introducing a new slane range plane coordinate system. Then it is proposed that these two models would lead to the same precision in height measurement. Finally, computer simulation is employed to validate the correctness of the theory analysis.

HTML全文

参考文献(1)

[1] Ferraiuolo G, Meglio F, and Pascazio V, et al.. DEMreconstruction accuracy in multichannel SAR interferometry[J].IEEE Transactions on Geoscience and Remote Sensing.2009, 47 (1):191-201 [2] Zebker H A, Werner C L, and Rosen R A, et al.. Accuracy oftopographic maps derived from ERS-1 interferometric radar[J].IEEE Transactions on Geoscience and Remote Sensing.1994, 32(4):823-836 [3] Seymour M S and Scheuer T E. Aspects of terrain heightestimation using interferometric SAR [C]. Geoscience andRemote Sensing Symposium IGARSS '92, 1992, (2):1573-1575. [4] Rosen P A, Hensley S, and Joughin I R, et al.. Syntheticaperture radar interferometry [C][J].Proceedings of the IEEE.2000, 88(3):333-382 [5] Knedlik S, Loffeld O, and Nies H. Sensitivity of DEMsgenerated from interferometric cartwheel configurations[C].2003 IGARSS: Learning From Earth's Shapes and Colours,Toulouse France, July 21-25 2003, (6): 3805-3807. [6] Eineder M and Adam N. A maximum-likelihood estimator tosimultaneously unwrap, geocode, and fuse SARinterferograms from different viewing geometries into onedigital elevation model[J].IEEE Transactions on Geoscienceand Remote Sensing.2005, 43(1):24-36 [7] 孙造宇，梁甸农，张永胜. 星载InSAR 系统DEM 重建及其误差分析[J].电子与信息学报.2008, 30(6):1336-1340浏览 [8] Abdelfattah R and Nicolas J M. Topographic SARinterferometry formulation for high-precision DEMgeneration [J]. IEEE Transactions on Geoscience and RemoteSensing, 2000, 40(11): 2415-2426. [9] Mora O, Agust O, and Bara M, et al.. Direct geocoding forgenneration of precise wide-area elevation models with ERSSAR data [C]. Fringe'99 Advancing ERS SAR Interferometryfrom Applications Towards Operations, Liege Belgium,November 10-12, 1999, (478): 449-455. [10] 谷德峰，易东云，朱炬波，等. 分布式InSAR 三维定位的闭合形式解及其精度分析[J]. 电子学报, 2007, 35(6): 1026-1031.Gu D F, Yi D Y, and Zhu J B, et al.. Closed-form solution ofdistributed InSAR geolocation and its precision analysis[J].Acta Electronica Sinica, 2007, 35(6): 1026-1031. [11] 徐华平，周荫清，李春升，等. 分布式小卫星SAR 回波信号的相关性[J]. 电子学报，2005, 33(6): 965-969.Xu H P, Zhou Y Q, and Li C S. Correlation of distributedsmall satellites SAR echoes[J]. Acta Electronica Sinica, 2005,33(6): 965-969.

施引文献

资源附件(0)

访问统计