码相关参考波形技术在卫星导航信号中的多径抑制性能研究

由于多径信号的弱相关性,无法通过差分技术加以消除,多径误差已经成为当前测距、定位中的主要误差源。通过理论分析和仿真验证表明:码相关参考波形技术(CCRW)具有比窄相关、双delta算法更为优异的多径抑制性能。以北斗B1I信号为例在工程样机进行实验验证,结果表明CCRW可以抑制除零码片附近的所有多径信号。通过选取不同的参考波形,可以简化接收机通道逻辑设计,达到节约硬件逻辑资源、降低接收机功耗的目的,具有良好的应用前景。

Research of Multipath Mitigation Performance for CCRW Technique in Navigation Signal

Due to the weak correlation of multipath signals, it cannot be eliminated by differential techniques. Errors brought by multipath have become the main source for ranging and positioning in some high precision applications. Through theory analysis and emulation, the CCRW technique has an outstanding multipath mitigation performance compared to the narrow correlator and double delta algorithm. Taking Beidou B1I signal as an example, the experiment was carried out on an engineering prototype receiver. The results show that, the CCRW algorithm has ability to mitigate the entire multipath delay signal except the delay around zero chips. Simplified receiver channel logic design through by optional local reference wave has the benefits of much less hardware resources and power consumption, showing a very promising applicable future.