| Bi-satellite formation SAR is an important novel spaceborne system, the research of differential interferometry based on this system is significant. This thesis studies differential interferometry based on Bi-satellite formation SAR, "two-pass" and "three-pass" methods of differential interferometry are focused on, and some details of these two methods in the processing are studied.The rationale and detection precision of "two-pass" differential interferometry based on Bi-satellite formation SAR are studied in chapter 2, the detection error in line-of-sight caused by phase error, DEM error and baseline error is analyzed chiefly, the processing flow of "two-pass" differential interferometry and the simulation experiment results of ground deformation detection are shown in the end of this chapter. The rationale and detection precision of "three-pass" differential interferometry based on Bi-satellite formation SAR are studied in chapter 3, the detection error in line-of-sight caused by phase error and baseline error is analyzed chiefly. In view of the abundant images acquired by the system, a method of data fusion that can eliminate stochastic errors is introduced to enhance the detection precision. The processing flow of "three-pass" differential interferometry and the simulation experiment results of ground deformation detection are shown in the end of this chapter, the availability of data fusion is proved at the same time. The problem of approximations in "three-pass" differential interferometry is studied in chapter 4. The expression of first-order approximation error is derived and properties of the error are discussed, certain methods to compensate first-order approximation error are gained in the end of this chapter. According to geolocaion, the method to detect ground deformation that only occurs in vertical direction is studied in chapter 5, and detection precision of "three-pass" differential interferometry for this type of deformation is discussed. |
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