AltBOC信号捕获技术研究

Study of acquisition technology for AltBOC signal

交替二进制偏移载波(AltBOC)信号是应用于Galileo导航系统E5频段的新型导航信号,该信号包含E5a和E5b两个边带,调制四路独立的导航信号。传统的捕获技术是对其中的一路信号进行捕获,仅能利用25%的信号功率,影响了捕获性能。因此在单边带捕获的基础上,采用双边带非相干联合和相干联合捕获两种方法,并进行了理论分析。最后仿真验证了理论分析的正确性。

Alternate Binary Offset Carrier（AltBOC） signal is a new navigation signal on the E5 frequency of Galileo system.This signal includes double side-band,E5a and E5b,and modulates four independent navigation signals.The traditional acquisition technology usually adopts one signal and 25% total signal power,which influence the acquisition performance.On the basis of single side-band acquisition,two methods of double side-band non-coherent combination acquisition and double side-band coherent combination acquisition are used,and the theory analysis is performed.The simulation validates the performance of these schemes.