导航接收机噪声电磁辐射阻塞效应分析

针对电磁辐射导致卫星导航系统定位丢失的现象, 通过干扰机理分析建立了噪声电磁辐射阻塞效应评估模型, 对导航接收机进行了效应试验与分析评估。为了解决由于工作信号较弱, 在待评估环境下导航接收机的敏感度数据不易准确测量的问题, 采用工作频点和带外敏感度相对平稳频点对敏感度数据进行了两点校准。校准后在随机噪声及单频复合噪声临界干扰下的效应指数均大于1, 最大误差为1.8 dB, 符合效应评估模型理论分析, 与试验现象一致。结果表明, 提出的噪声电磁辐射效应评估模型可同时用于装备带内和带外噪声干扰效应评估, 而两点校准方法对提高弱工作信号下的受试装备效应评估准确度意义重大。

Analysis of blocking effects of electromagnetic radiation noise on navigation receiver

Aiming at the phenomenon that the satellite navigation system loses its positioning caused by electromagnetic radiation, an effect evaluation model of electromagnetic radiation noise based on interference mechanism analysis is established. The effect experiment and the analytical evaluation on the navigation receiver are performed. In order to solve the problem that the sensitivity data of the navigation receiver is difficult to be accurately measured due to weak working signals in the environment to be evaluated, two-point calibration is carried out on sensitivity data by using the working frequency point and a relatively stable frequency point of out-of-band. The effects index of both random noise and single-frequency compound noise is greater than 1 after calibration. The maximum error is 1. 8 dB, which is conformed to the theoretical analysis of the effects evaluation model and is consistent with the experimental phenomenon. The results show that the proposed effect evaluation model of electromagnetic radiation noise can be used for in-band and out-of-band noise interference effects evaluation simultaneously, while the proposed two-point calibration method is of great significance to improve the effects evaluation accuracy of tested equipment with weak working signals.