Frequency domain equalization method and system of GNSS (Global Navigation Satellite System) anti-interference filter, receiver and medium

Abstract

The invention provides a frequency domain equalization method and system of a GNSS (Global Navigation Satellite System) anti-interference filter, a receiver and a medium, and particularly relates to the technical field of GNSS interference signal suppression, and the scheme comprises the following steps: inputting an intermediate frequency signal of a collected GNSS signal into the anti-interference filter to obtain a filtered intermediate frequency signal; predicting and filtering the intermediate frequency signal based on a tracking result output by a receiver baseband and a preset frequency spectrum amplitude to obtain a reference frequency spectrum of an interference frequency band; obtaining a reference spectrum of an interference-free frequency band based on the normal intermediate frequency signal; and fusing the reference frequency spectrum of the non-interference frequency band and the reference frequency spectrum of the interference frequency band to obtain a complete reference frequency spectrum, and further carrying out equalization processing on the filtered intermediate frequency signal to obtain an equalized GNSS signal. According to the scheme, signal distortion caused by a traditional anti-interference filter can be remarkably improved, so that the anti-interference performance of the GNSS is effectively improved, and the quality of signals output by a receiver is improved. 本发明提供的GNSS抗干扰滤波器的频域均衡方法、系统、接收机及介质，具体涉及GNSS干扰信号抑制技术领域，该方案包括：将采集到的GNSS信号的中频信号输入至抗干扰滤波器中，获得滤波后的中频信号；基于接收机基带输出的跟踪结果和预设的频谱幅度，对中频信号进行预测并进行滤波处理，获得干扰频段的参考频谱；基于正常中频信号，获得无干扰频段的参考频谱；将无干扰频段的参考频谱和干扰频段的参考频谱进行融合，获得完整的参考频谱，进而对滤波后的中频信号进行均衡处理，获得均衡后的GNSS信号。该方案能够显著改善传统抗干扰滤波器引起的信号畸变，从而有效提高GNSS的抗干扰性能，进而提高接收机输出的信号的质量。