基于带宽比例因子的导航信号带宽优化

摘要

The navigation signal frequency bandwidth increasingly becomes important recourse strived by the satellite navigation system builders, and optimized bandwidth design of the navigation signal is good for improving frequency use efifciency and multi-system compatibility. In this paper, the new parameter of bandwidth ratio index is proposed, and taken the example of the BPSK, sinBOC and cosBOC signals, the variations of pseudo noise (PN) code tracking precision, multipath mitigation capability, anti-jamming capability with the bandwidth ratio index are analyzed, and the bandwidth ratio index is optimized aiming at these performances’ optimization. The results show that the optimized BPSK signal’s bandwidth is 0.8Rc, the optimized sinBOC and cosBOC signal’s bandwidth is ± ( f s+0.8Rc ) .%导航信号频率带宽日益成为各卫星导航系统建设者们竞相抢夺的重要资源，信号带宽优化有利于提高频率利用率和多系统兼容性。本文提出了带宽比例因子这一参量，针对BPSK，sinBOC，cosBOC信号，分析了其伪码跟踪精度、抗多径性能、抗干扰性能随带宽比例因子变化的关系，并以这些性能优化为目标设计了优化的带宽比例因子。结果表明，BPSK信号最优化的带宽为主瓣宽度的0.8倍；sinBOC，cosBOC信号最优化的带宽为±(fs+0.8Rc)。