摘要
针对北斗B1频段MEO/IGSO卫星上NH码调制导致捕获难度增大的问题,对GPS所用的差分捕获算法进行改进,得出了一种适合北斗B1 MEO/IGSO卫星的捕获算法。通过本地生成经NH调制的C/A码作为新的伪随机码,加长相干积分时间,以差分累加的方式对相干积分结果进行运算,并按照累加结果最大准则判断差分项的符号,找出最佳搭配组合。仿真结果表明,改进算法能提高2 d B^3 d B的增益。
A difference acquisition algorithm for Beidou B1 MEO/IGSO satallite is proposed by improving the acquisition algorithm of GPS signal. It can be used to solve the problem that NH code in Beidou B1 MEO/IGSO satallite makes the acquisition more difficult. Firstly, a new pseudo-random code is generated by modulating the Neumann-Hoffman（ NH） code onto the C/A code to lengthen the coherent time. Then, the result of coherent integration is calculated by the differential accumulation method. Finally, ac-cording to the maximum criterion of the cumulative result, the sign of the differential term can be determined and the best combi-nation can be obtained. Simulation result shows the gain can be improved 2 d B ~ 3 d B by the algorithm.
作者
邢永强
黄海生
曹新亮
Xing Yongqiang;Huang Haisheng;Cao Xinliang(School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi ’an 710121,China;School of Physics and Electronic Information,Yan’an University,Yan’an 716000,China)
出处
《电子技术应用》
2018年第6期90-93,共4页
Application of Electronic Technique
基金
国家自然科学基金项目(61661049)
