一种卫星导航信号扩频码优选方法

A method for optimizing spread spectrum codes of satellite navigation signals

在基于码分多址的卫星导航系统中,用户接收机通过导航信号中的扩频码来区分不同卫星的信号并进行导航定位,扩频码一方面起到区分导航卫星的作用,另一方面用于测距。其性能直接影响系统的定位和抗干扰等关键指标,是卫星导航信号性能的决定性影响因素。所以研究改进扩频码优选方法对于提升导航系统性能,促进卫星导航系统的建设有具有重要作用和意义。本文在借鉴国内外卫星导航扩频码优选方法的基础上,提出了一种新的扩频码优选方法,并用该方法进行了扩频码的优选仿真,结果表明:新的优选方法可以得到综合性能更优的扩频码。

In the satellite navigation system based on code division multiple access(CDMA),the user receiver distinguishes the signals of different satellites by the spread spectrum code in the navigation signal and carries out navigation and positioning. The spread spectrum code plays the role of distinguishing navigation satellites on the one hand and ranging on the other. Its performance directly affects the system positioning and anti- jamming and other key indicators,and is the decisive factor affecting the performance of satellite navigation signals. Therefore,it is of great significance to study and improve the optimization method of spread spectrum code for improving the performance of navigation system and promoting the construction of satellite navigation system. In this paper,a new method of optimizing spread spectrum codes for satellite navigation is proposed on the basis of referring to the methods of optimizing spread spectrum codes for satellite navigation at home and abroad. The simulation of optimizing spread spectrum codes is carried out with this method. The results show that the new optimizing method can obtain the spread spectrum codes with better comprehensive performance.