中文摘要：

研究了长基线干涉仪（LBI）体制下基于球面波前模型的瞬时测距无源定位问题，运用几何学原理，推导了一种利用无模糊相位差测量量对目标辐射源的单脉冲被动测距、测角的新定位方法，并通过MATLAB仿真验证了该方法的正确性。分析了定位精度与基线长度测量精度和相位差测量精度之间的关系，指出基线长度测量误差对定位精度的影响是不能忽略的。通过MATLAB仿真给出了不同测量精度下的GDOP等值线图。最后对进一步研究的方向进行了探索。

英文摘要：

The instantaneous ranging passive location problem based on the spherical wave model, which utilizes a phase interferometer structured system,is discussed. By using geometry theories and phase difference without ambiguities,the emitter＇s range and AOA can be detected by a single pulse. The method is proved to be correct by the MATLAB simulation. The theoretic precision analysis of the method is deduced. It is pointed out that the measure error of the baseline length cannot be ignored. By the calculation of the GDOP in the detection region under various conditions, the precision distribution characteristics of the location method are drawn out. The future research orientation is also discussed at last.