现代化GNSS信号恒包络复用方法  

Constant Envelope Multiplexing Methods for the Modernized GNSS Signals

作　　者：严涛[1] 王瑛[1] 曲博[1] 王国永[1] 雷文英[1] 

机构地区：[1]中国空间技术研究院西安分院,西安710000

出　　处：《空间电子技术》2017年第5期27-33,40,共8页Space Electronic Technology

摘　　要：现代化GNSS信号具有多调制、多分量、多频点的特点,为了最大化星上高功放的效率并减少失真,需要采用恒包络复用技术。介绍了现代化GNSS信号的单频、双频恒包络复用技术,研究了通过相位查找表求解恒包络复用信号解析表达式的方法。通过仿真,对比分析了带限对恒包络特性的影响。结果表明,带限时单频恒包络复用方法比信号分量的直接线性组合的峰均比改善约2d B;对于双频恒包络复用方法,带限时信号的峰均比并不随带宽的增加而单调下降,为GNSS信号设计和带宽选择提供了一定的理论参考。The modernized GNSS signals have the features of multiple modulations,multiple signal components and multiple frequencies. In order to maximize the efficiency of high power amplifier（ HPA） and reduce signal distortions,the constant envelope multiplexing techniques are required. This paper introduces the single-frequency and dual-frequency constant envelope multiplexing methods for the modernized GNSS signals,and studies the solution to solve the analytical expression of the combined signal based on the phase look-up table（ LUT）. Finally,the impact of band-limitation on constant envelope character is analyzed by simulation. Simulation results show that the peak to average ratio（ PAR） of single-frequency constant envelope multiplexing signals is 2 d B lower than the direct linear sum of signal components under band-limitation.For dual-frequency constant envelope multiplexing signals,the law of change between PAR and signal bandwidth is not linear. These conclusions provide a theory guidance for GNSS signal design.

关 键 词：全球导航卫星系统 恒包络复用 查找表 交替二进制偏移载波 

分 类 号：V474[航空宇航科学与技术—飞行器设计]