在扩频体制的无线电导航系统中,为了同时消除远近效应和天波干扰,分析了干扰的因素,建立了实现原理框图,提出了一种改进多径干扰抵消技术。利用串行干扰抵消获得较准确的初始数据估计,在此基础上用并行干扰抵消使信息数据更加精确。仿真结果表明,这种改进干扰抵消方法的解调延迟比串行干扰抵消更低,相比于并行干扰抵消,此方法在远近效应环境中具有更高的准确性。

IN the radio navigation system, there are near far effect and sky wave interference. The reason of the interference is analyzed, implement the scheme is presented, and improved multipath canceller is proposed. The successive interference cancellation section obtains the initial data estimation, and the parallel multipath cancellation section improves the accuracy of data estimation. The simulations show that the method can attain shorter delays than successive interference cancellation, and higher performance to near far effect than parallel interference cancellation.