Research On Simulation And Application Of Spaceborne InSAR Ideal Interferometric Factors

The spaceborne interferometric synthetic aperture radar (InSAR) is a novel remote sensing system, as an important means to acquire quickly worldwide high precise DEM disregard time and weather, thus enable it a hot research in inside and outside China. Especially, the spaceborne distributed InSAR new conception system bringed forward in recent years made the research to reach a climax. To acquire information and handle errors in every step are main causes to influence the precision of height measurement, so both for single pass InSAR system, and for repeat pass system, height measurement errors analysis and performance evaluation are important research content in fields of system analysis and design. This paper dedicated to the generation method of ideal interferometric factors, and based on InSAR simulating system, worked over the application of ideal interferometric factors in errors quantitive analysis and processing arithmetic perfomance quantitive evaluation of spaceborne InSAR height measurement. The height measurement theory of the spaceborne InSAR is given in chapter 2. According to height measurement theory, that the seizing act of the absolute interferometric phase and the mathematic model for height measurement are presented, that errors transfer relation model of height measurement is built comprehensively, and the impact of the three synchronization errors characterized the distributed InSAR system specially is analyzed. By this, the generation and the application of the spaceborne InSAR ideal interferometric factors are based on. Here also introduced the spaceborne InSAR processing simulation system developed and researched by the author's project group independently.The generation method of spaceborne InSAR ideal interferometric factors is shown in chapter 3. Based on the most common bistatic model, forward generation method and backward generation method of the spaceborne InSAR ideal interferometric phase were sourced from double base interferometric model. Two quick improved methods to the huge calculating task of ideal interferometric factors are proposed, moreover the precision of the two methods with the quick nature is analyzed theoretically in this chapter.The application of ideal interferometric factors to errors quantity analysis and processing arithmetic performance quantitive evaluation in the distributed InSAR height measurement system is discussed in chapter 4. Since starting from the simulating data, ideal interferometric factors is used to check the validity of InSAR simulating model, that can be divided into two sides: one is that whether interferometric image pair reflected the interfering nature of spaceborne distributed InSAR straight ,another is that whether the statistics property of interferogram is in line with theory mathematics model.What followed is that enable how to apply ideal registration offset to frequency synchronization errors quantitive analysis in distributed InSAR system as an example to illustrate the application of ideal interferometric factors in system errors quantitive analysis. Moreover, that how to apply ideal interferometric factors to isolate registration errors and make performance evaluation to InSAR signal processing is given. In the end, the function and the usage of software integrated the research results of this paper is introduced.