模拟鉴相圆阵干涉仪测向性能的提高及其验证

Direction finding performance improvement of circular array interferometer with analog phase detector and its verification

模拟鉴相圆阵干涉仪相对于数字鉴相需要较高的信噪比,故其测向性能即解模糊概率和测向精度较低。针对这一问题提出两种提高其测向性能的方法,分别为改进型相位积累法和最优基线法。改进型相位积累法用于提高解模糊概率和测向精度,解决了因模拟鉴相特有的±π附近的相位跳变性造成的传统积累错误的问题。最优基线法以某一基线组合对应的方位角为参考输出测向精度最高的基线组合对应的方位角和俯仰角,用于提高测向精度。两种方法可组合使用。仿真和实测结果均表明了这两种方法的有效性和正确性。

The circular array interferometer with the analog phase detector requires a higher signal-to-noise ratio than the digital phase detector, which leads to the poorer performance, i.e. the lower ambiguity resolution probability and the lower direction finding （DF） accuracy. Two kinds of methods to improve the performance of DF are proposed. They are the modified phase accumulation method and the optimal baseline method. The mod ified phase accumulation method can improve the ambiguity resolution probability and DF accuracy, and the problem in conventional accumulation caused by the unique phenomenon of phase jump near ~ n in the analog phase detector is solved. Taking the azimuth corresponding to one certain baseline pair as a reference, the azi muth and elevation corresponding to the baseline pair which has the highest accuracy are output, which improve the DF accuracy. Two kinds of methods can be combined. Simulation and measurement results show the effectiveness and correctness of these two methods.