周亚强，孙军，李剑
(北京航天指挥控制中心，北京  100094)

摘  要：数字式多基线相位干涉仪具有测向精度高的优点，在深空探测中有着广泛的应用。为了解决增大最大无模糊角度与提高测向精度之间的矛盾，将会在多基线干涉仪中采用参差基线关系进行测向，这样可以大大增加最大无模糊角度。但在噪扰条件下，还有一些有待讨论的问题，包括：参差系数的选取、测向精度、正确解模糊的条件以及对输入信号信噪比的要求等。对以上这些问题进行了深入的研究，给出了参差系数的选取方法、理论测向精度、正确解模糊允许的最大噪扰、最低信噪比以及可以正确解模糊的角度范围，计算机仿真结果表明了理论分析的正确性。

关键词：测向；多基线相位干涉仪；参差；角度模糊

A Kind of Method and its Performance of Measuring DOA Using Digitized Multi-Baseline Interferometer
ZHOU Ya-qiang，Sun Jun，Li Jian
(Beijing Aerospace Command and Control Center，Beijing 100094，China)

Abstract: Digitized multi-baseline interferometer have the merit of high direction accuracy, so it has an extensive application in deep space exploration. But it is a conflict that enlarge maximum unambiguous direction and improving direction accuracy at the same time. To deal with such problem, stagger baselines are adopted, thus maximum unambiguous direction can be enlarged greatly. The influences the noise may have on the direction result are presented. The paper discusses the following problems: selection of stagger parameters , direction accuracy , condition of solving ambiguous correctly; limitation for input SNR. The maximal noisy , minimal SNR and direction range of solving ambiguous correctly are put forward.The correctness of theoretics analysis is effectively demonstrated by computer simulation.

Keywords: DOA;multi-baseline interferometer;stagger;direction ambiguity