Abstract:

Based on the mast vector measured by the optical approach on the single interferometric synthetic aperture radar satellite, the spatial baseline model is established by the conversion relationship. Various error sources during the phases of installation, measurement and on orbit flight are taken into account, such as satellite attitude error, outer antenna attitude error, installation position on ground calibration residual, satellite and antennas on orbit distortion, measurement system axes calibration residual, measurement error of hardware. The characteristics of the error sources are analyzed, and the error propagation mechanism from the error sources to the spatial baseline is presented. The error evolvement features of the propagation procedure are derived. The optimal installation positions of the measurement equipment and the cooperating targets are also obtained based on the theoretical deduction. An example of precision inversion strategy of the baseline length is illustrated from the perspective of inverse problems. The idea can be applied to support the design of baseline measurement scheme, installation scheme, processing algorithms, etc.