暗室条件下抗干扰测试结果影响分析

暗室为卫星导航接收机抗干扰测试提供了全面有效的测试环境，极大地提高了抗干扰性能定量测试与评估能力。但暗室的静区性能、结构尺寸、天线布局等因素会对抗干扰性能测试结果产生影响。基于多径信号天线接收模型、阵列波程差等效模型和信号来向天线映射模型，通过仿真量化分析了干扰多径信号、有限距离下近场效应和来波方向误差对抗干扰测试结果的影响。结果表明，暗室静区性能的提升可降低干扰多径信号对零陷位置的拉偏；不同暗室尺寸对应不同的零陷深度测试，需根据测试需求折中选择；布设暗室天线应依据预设的被测阵列天线和测试场景。结果可为暗室设计、抗干扰测试方案选定和测试结果分析提供参考，提升抗干扰测试的可信度。

Effect Analysis of Anti-Jamming Test Under Anechoic Chamber

The anechoic chamber provides a comprehensive and effective test environment for the anti-jamming test ofsatellite navigation receiver, which greatly improves the quantitative test and evaluation of anti-jamming capability. However, thequiet zone performance, structural size, antenna layout and other factors of the anechoic chamber will affect the anti-jammingcapability test results. Based on the antenna receiving model of multipath signals, equivalent model of array wave path difference andthe mapping model of signal to antenna, the influence of jamming multipath signal, near-field effect under limited distance anddirection error of incoming wave on anti-jamming test results is quantitatively analyzed by simulation. The results show that theimprovement of the quiet zone performance of anechoic chamber can reduce the deviation of the jamming multipath signals to thenull position; different anechoic chamber sizes correspond to different null depth tests, a compromise should be made based on thetesting requirements; and the anechoic chamber antennas should be laid according to the preset tested array antenna and the testscenario. The results can provide reference for anechoic chamber design, anti-jamming testing plan and testing result analysis, andimprove the credibility of anti-jamming test.