卫星导航系统现代化背景下多路信号复用问题研究

项目名称： 卫星导航系统现代化背景下多路信号复用问题研究

项目编号： No.61304230

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 自动化技术、计算机技术

项目作者： 刘卫

作者单位： 上海海事大学

项目金额： 25万元

中文摘要： 多路信号的优化复用对卫星导航系统实现星上设备高效利用、保证系统平稳过渡的现代化进程至关重要。传统的信号复用方法只能采取解析或数值模拟单一的方式，且难以实现不同频点多路信号复用的高效率和弱互相关性能。本项目基于优化复用（Optimal Aligning Method, OAM）方法，推导出多路恒包络复用信号的一般化解析表达式，建立解析和数值方法相结合的优化复用方法；针对多路信号复用的互相关干扰问题，建立影响码和载波跟踪的相位偏差模型，提出降低互相关干扰的信号分量相位关系策略；以最小复用损耗为目标函数进行多路信号的优化相位搜索，形成相应的信号复用方案并进行复用效率评估，提出同频点及不同频点多路信号的优化复用方案。本项目的研究可为卫星导航系统现代化信号体制设计以及我国北斗系统实现区域向全球平稳过渡提供建议和可参考的理论依据。

中文关键词： 全球卫星导航系统；信号体制；信号调制；复用调制；优化复用方法

英文摘要： The optimization of multiple signal multiplexing can achieve efficient use of satellite equipment and ensure a smooth transition of the system. It is very important to the modernization of satellite navigation system. The conventional signal multiplexing methods can only take a single way of analytical or numerical simulation. And it is difficult to achieve signal multiplexing with the high efficiency and weak cross correlation performance. Based on the optimal aligning method, this project firstly deduces the generalized analytical expression of multiplexed constant envelope signal and establishes the combining method of analytical and numerical. For the cross-correlation interference of multiplexed signal, this project establishes the code and carrier tracking phase error model and proposes the phase relation strategy of signal component to reduce the cross-correlation interference. Finally, based on the optimized phase search with minimal power loss as the objective function,the optimized signal multiplexing schemes of the same frequency and different frequency was established. The research methods and results can provide theoretical support and reference for the signal structure modernization of Beidou system from regional Phase II to global Phase III transition and the other systems.

英文关键词： GNSS；Signal structure；Signal modulation；multiplexing modulation；Optimal aligment method