摘要
为研究InSAR系统相对测高精度的变化规律,从InSAR系统高程测量的原理出发,给出了相位误差对相对测高精度影响的分析方法,并详细分析了信噪比、体散射、时间去相干等非理想因素对相位误差的影响.对不同波段星载InSAR系统,采用该方法进行了相对测高精度随下视角变化的理论分析,得出在短波长固定基线条件下存在使相对测高精度最优的下视角,并通过计算仿真验证了该最优下视角的存在.该方法和结论有助于星载InSAR系统的参数设计和性能分析.
To investigate the variation of relative height accuracy measured by InSAR system,how the phase error impacts on the relative height accuracy is analyzed on the basis of InSAR elevation measurement principle.The factors,which affect phase error,are researched in detail,such as signal to noise ratio,volume scattering,and temporal decorrelation,etc.Above methods has been used to analyze the relative height accuracy for spaceborne InSAR system with different wave bands.The results show that,under the condition of short wave length and fixed baseline,there is a look downwards angle that would optimize the relative height accuracy.Further,the numerical simulation has verified the existence of optimum look-down angle.The method and conclusions presented in this article are helpful for parameter design and performance analysis of InSAR system.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2012年第2期179-183,共5页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(61001189)
关键词
干涉合成孔径雷达
相位误差
相对测高精度
interferometry synthetic aperture radar
phase error
relative height accuracy
