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对几种被动定位方法的定位精度进行了计算比较，选择了可行的定位方法，分析了影响定位精度的有关因素，并对其加以说明。
Several kinds of passive positioning methods have been compared and their positioning accuracy has been calculated and compared. A feasible positioning method has been selected, and the relevant factors affecting the positioning accuracy have been analyzed and explained.