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针对无线电导航系统中存在的远近效应和天波干扰,提出了一种选通的部分并行干扰抵消方法,通过捕获跟踪输出的相关峰值判决对强干扰信号进行选通并抵消,从而提高接收机对弱导航台信号的捕获性能.给出了算法的结构及理论分析,并对算法进行了仿真.结果表明:部分干扰抵消算法能够消除无线电导航系统中存在的远近效应和天波干扰,改善导航接收机的捕获性能,消除导航接收机的工作盲区.最后采用现场可编程门阵列技术对其进行了硬件电路设计和实验验证,并进行了实验验证,结果表明该方法能够改善弱信号的信噪比,消除远近效应和天波干扰.
Aiming at the near-far effect and sky-wave interference existing in the radionavigation system, a gated partial parallel interference cancellation method is proposed, which gathers and cancels the strong interference signal by capturing the correlation peak of the tracking output, so as to improve the receiver weakness The performance of the navigation station signal acquisition is given.The structure and theoretical analysis of the algorithm are given and the algorithm is simulated.The results show that the partial interference cancellation algorithm can eliminate the near-far effect and the sky-wave interference existing in the radionavigation system and improve the performance of the navigation receiver Capture the performance of the navigation receiver to eliminate blind spots.Finally, using field programmable gate array technology to its hardware design and experimental verification, and experimental verification, the results show that the method can improve the signal to noise ratio of weak signals, eliminate Far-near effect and sky-wave interference.