推导了星载合成孔径雷达严密几何成像模型与有理多项式模型的等效关系,通过对全链路误差传播特性进行建模,仿真评估了定位精度与图像源夹角、同名点匹配精度等影响因素的定量关系,分析了异源立体定位所能达到的理论精度及其优越性,并推导出一套明确的数据选择策略。通过在轨数据实验充分验证了所提理论的正确性,并详细分析了不同数据组合下的误差规律,为异源立体定位的实际应用提供了可靠依据。

The equivalent relationship between the spaceborne synthetic aperture radar strict geometry imaging model and the rational polynomial model is derived. By modeling the error propagation characteristics of the whole link, we simulate and evaluate the quantitative relationship among positioning accuracy, image source angle and corresponding point matching accuracy. The theoretical accuracy which heterogeneous stereoscopic positioning can achieve and its superiority are analyzed, and a set of explicit data selection strategies is derived. Correctness of the proposed theory is fully verified by the in-orbit data test, and the error rules under different data combinations are analyzed in detail, which provides a reliable basis for the practical applications of heterogeneous stereoscopic positioning.