为了深入了解多站无源定位的机理进而提高其定位精度，对双站纯方位无源定位中的相关问题进行了理论分析。首先研究了影响双站定位性能的因素，指出只有当测量误差足够小及两传感器间夹角不接近 0和 π时，双站系统才具有无偏性并有可能达到一致性估计；其次，指出当过小和过大夹角相对于 0和 π而言具有相同的幅度时，过小夹角对定位精度的消极影响要大于过大夹角；最后，分析了两种定位误差协方差获取方法的等价性。仿真结果验证了对上述问题的分析，并指出本文结论可以应用到基于传感器管理的多站无源定位算法中。

To comprehend the mechanism of multi-sensor passive localization thoroughly and then improve its localization precision, several related issues in dual-sensor bearing-only localization are theoretically analyzed. First the factors that can affect the dual-sensor localization performance are studied, which indicate that only when the measurement error is small enough and the cut angle between the sensors is not close to 0 and π, the dual-sensor system is unbiased and may be consistent. Next we point out that the negative impact of small enough cut angle on the localization precision is greater than that of large enough cut angle when they have the same magnitudes in terms of 0 and π. Finally, the equivalence of two localization error covariance methods is analyzed. Simulation results verify the above analysis, which indicate that the corresponding conclusions can be applied to multi-sensor passive localization algorithms based on sensor management.