基于机载平台的干涉仪测向技术研究

Research on interferometer DF technique based on airborne platform

围绕工程实际中干涉仪测向技术面临着布阵平台空间有限、不能同时对多个信号分辨的问题进行研究,提出相应的解决办法。首先根据机载平台特点,给出了5元均匀椭圆阵列模型,分析了椭圆阵列孔径与波长之比对入射角度的估计性能影响,得出了在一定孔径范围内增大阵列孔径能提高测向精度的结论;接着采用四阶累积量MUSIC算法引入虚拟阵元来解决受限平台上增大孔径的问题,仿真验证了此算法在干涉仪椭圆阵列模型中的有效性。

The problems that the interferometer DF technology is facing in the practical engineering is that the maneuvering platform space is limited and multiple signals can not be distinguished at the same time. An corresponding solution was proposed after the problems were studied. According to the characteristics of the airborne platform, a five elements uniform elliptic array model is given. The influence of elliptical array aperture and the wavelength ratio on the estimation performance of the incident angle are analyzed. A conclusion that increasing array aperture in a certain range can improve the accuracy of direction finding was achieved. The virtual array element is introduced by using the four order cumulant MUSIC algorithm to solve the problem of increasing aperture on the limited platform. Simulation results show that this algorithm is effective in the interferometer elliptical array model.