At present, the research on the tracking performance of navigation receivers is based on the conditions of single-frequency interference, however, the space electromagnetic environment is complicated, and so it is necessary to study the effect of the navigation receiver under multifrequency interference. Through the analysis of the blocking interference mechanism of the navigation receiver and the mathematical model of the tracking loop, the effect model under in-band and out-of-band multifrequency interference is established, when the satellite tracking is missing. The Beidou navigation receiver is used as the experiment object to build a multifrequency interference effect experiment platform, and the carrier-to-noise ratio ( C / N ₀ ) threshold is used as the criterion for the satellite tracking missing, Finally, the model is verified with the experimental data, the error of the model under tri-frequency out-of-band interference exceeds 3 dB. For reducing the model error, the corrected model is proposed, and the corrected model errors are less than 1 dB. The model is helpful to predict the satellite signal status in the navigation receiver under complex electromagnetic environments.

中文翻译：

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B1I导航接收机在多频干扰下的效果研究

目前对导航接收机跟踪性能的研究是基于单频干扰的条件，而空间电磁环境复杂，因此有必要研究导航接收机在多频干扰下的效果。通过分析导航接收机的阻塞干扰机理和跟踪环路的数学模型，建立了卫星跟踪缺失时带内和带外多频干扰下的影响模型。以北斗导航接收机为实验对象，搭建多频干扰效应实验平台，载噪比（ C / N ₀ ) 阈值作为卫星跟踪缺失的判据，最后用实验数据对模型进行了验证，模型在三频带外干扰下的误差超过3 dB。为降低模型误差，提出了修正模型，修正后的模型误差小于1 dB。该模型有助于预测复杂电磁环境下导航接收机的卫星信号状态。