摘要
针对卫星导航现代化条件下的导航信号复用问题,在对正交叉积正弦副载波调制信号和正交叉积方波副载波调制信号的调制方法进行详细分析的基础上,提出了一种新的基于正弦波采样的正交叉积副载波调制方法。应用周期信号的傅立叶级数展开方法,给出了以上三种调制信号的调制表达式和功率效率,并根据这些结果比较了三种副载波调制信号的性能。分析和仿真结果表明:正交叉积正弦副载波调制和正交叉积方波副载波调制都是正交叉积抽样正弦副载波调制的特例,而当抽样指数大于16时,正交叉积抽样正弦副载波调制信号在性能上与正交叉积正弦副载波调制信号接近,但实现方式却比较简单。
Aimed at navigation signal multiplexing in the condition of satellite navigation system modernization, signal multiplexing methods based on sine wave and square wave quadrature product subcarrier modulation （QPSM）are analyzed in detail. A new subcarrier modulation method based on sample sine wave is proposed. Formulae nd power efficiencies of these three subcarrier modulation signals are given using Fourier series expansion. The performances of these three methods are compared based on the analysis conclusions. The results show that quadrature product sine subcarrier modulation and quadrature product square wave subcarrier modulation can be treated as the special examples of quadrature product sample sine wave subcarrier modulation, and when sample index exceeds 16, the power efficiencies of the two nearly equivalent, but quadrature product sample sine wave subcartier modulation signal could be implemented easily.
出处
《电波科学学报》
EI
CSCD
北大核心
2009年第6期1082-1088,共7页
Chinese Journal of Radio Science
基金
导航预研基金项目(No.9140A24010808HK01)
关键词
卫星导航
信号复用
正交副载波调制
功率效率
satellite navigation
signal multiplexing
quadrature product subcarriermodulation（QPSM）
power efficiency
作者简介
罗显志（1976-），男，湖北人，博士，信号与信息处理专业，主要研究方向为：卫星导航、阵列信号处理等。联系人：罗显志E-mail：xianzhiluo@tom．com
