摘要
干涉仪测向算法通过将接收信号相位差与本地相位差样本进行拟合从而获得信号的来波方向,具有布阵灵活、计算量小等特点,工程应用性较高。但由于存在天线工艺误差以及接收机幅相特性不一致等因素,导致了相位误差的引入。当相位误差具有较大时变性时,本地相位差样本的校准作用将会失效,从而严重影响干涉仪测向算法的性能。为提高干涉仪算法在相位扰动条件下的测向稳定性,提出了一种基于天线响应幅度修正的干涉仪测向算法及其优化方法,通过将信号接收幅度引入算法并做加权处理,降低了干涉仪算法的测向误差和对系统幅相一致性的要求。经计算机仿真验证,不同时变相位误差条件下,优化后的干涉仪算法其测向平均误差仅为传统干涉仪测向算法的38%,提高了算法在干扰条件下的精度和稳定性。
When interferometer algorithm works, it uses the phase differences of signal and the phase differences in local data to calculate the DOA. The interferometer direction-finding method has been widely used in engineering because of its flexible and the small amount of calculation. However, because of the array fabrication errors and the receivers’ inconsistent of phase, the accuracy of interferometer could be strongly affected as the calibration effect of local phase samples will fail when time-changing phase errors in present. Aiming at improving the algorithm stability in phase interference, we propose a refinement method of interferometer algorithm based on the response anisotropy of array and its optimized version, both of which improve the algorithm accuracy and weaken the dependence on the system’s phase consistency. Furthermore, computer simulation verifies that under the condition of different phase errors, the average directional error of the optimized interferometer algorithm is reduced to 38% compared with traditional interferometer algorithm, which shows that the accuracy and stability of the interferometer algorithm are significantly improved under interference conditions.
作者
苗峻
窦修全
聂宏印
刘长远
Miao Jun;Dou Xiuquan;Nie Hongyin;Liu Changyuan(The 54th Research Institute of CETC,Shijiazhuang 050081,China;Hebei Key Laboratory of Electromagnetic Spectrum Cognition and Control,Shijiazhuang 050081,China)
出处
《电子测量技术》
北大核心
2021年第24期47-51,共5页
Electronic Measurement Technology
关键词
干涉仪
测向
干扰
算法修正
interferometer
direction finding
interference
optimized method
