导航接收机带外电磁干扰的效应规律及预测方法研究

针对复杂电磁环境中无人装备的卫星导航定位功能易受到电磁干扰影响的问题, 提出带外电磁干扰的效应规律和带外双频干扰的预测模型。首先, 从大信号阻塞干扰的机理出发, 推导得到带外双频电磁干扰下导航接收机卫星跟踪丢失的预测模型。其次, 开展单源电磁干扰的效应试验, 得到不同卫星的电磁敏感阈值曲线, 并对除主敏感频带外其他敏感频带的产生机理进行分析。最后, 开展了双频电磁干扰的效应试验, 通过试验数据验证了该模型的预测误差在±2 dB以内, 为无人装备在带外电磁干扰预测方面提供了有效方法。

Investigation on the effect law and prediction method of out-of-band electromagnetic interference in navigation receiver

Aiming at the problem the satellite navigation's positioning functions of unmanned equipment in complex electromagnetic environments are susceptible to electromagnetic interference (EMI), the effect of out-of-band EMI and the prediction model of out-of-band dual-frequency interference are proposed. Firstly, a prediction model of navigation receiver satellite tracking loss under dual-frequency EMI is derived, which is based on the mechanism of large-signal blocking interference. Secondly, through the single-source EMI effect experiment, the electromagnetic sensitivity threshold curve of different satellites was obtained, and the generation mechanism of other sensitive frequency bands except the main sensitive frequency band was analyzed. Finally, a dual-frequency EMI effect experiment was carried out, and the experimental data verified that the prediction error of the model was less than 2 dB, which provides a method for unmanned equipment to predict out-of-band EMI.