低信噪比下高符号速率定位系统信号的捕获及在特定系统中的一种实现  

Signal Acquisition of High Data Rate Position System on Weak Signal Environment and Its Implementation in a Supposed System

作　　者：李坚[1] 赵明[1] 高群毅[1] 

机构地区：[1]清华大学FIT大楼4-408信研院无线中心,北京100084

出　　处：《遥测遥控》2008年第4期23-29,51,共8页Journal of Telemetry,Tracking and Command

摘　　要：通过对低信噪比下GPS信号与高符号速率定位系统信号的直接非相干累加捕获性能做出比较,说明低信噪比下GPS捕获算法不宜直接应用于其他系统信号的捕获,高符号速率定位系统捕获性能可以通过新的算法得到改善。提出一种可以改善低信噪比下高符号速率系统信号捕获性能的捕获算法,对算法中的参数和捕获性能的关系进行了研究,并且通过与直接非相干累加捕获性能的比较,指出了算法的适用范围。最后针对假设的某高符号速率定位系统提出了具体硬件设计方案,达到了与目前高灵敏度GPS接收机相当的捕获性能。In this paper,a comparison of acquiring performance using incoherent integration between GPS signal and high data rate position system signal is done,which explains that it is not proper to acquire signals of high data rate systems directly using algorithms for GPS receiver on weak signal environment.It is possible to improve the acquiring performance of high data rate systems by developing new algorithms.Then such a high sensitivity acquiring algorithm is raised.The influence of parameters of the algorithm on the acquiring performance is also studied.A comparison of acquiring performance is made between incoherent integration and the new algorithm at different signal powers,so the power range better for the new algorithm is calculated.At last an implementation scheme for a supposed position system is proposed,of which the acquiring performance is the same as the high sensitivity GPS receiver.

关 键 词：高符号速率 定位系统 捕获 低信噪比 

分 类 号：TN967.1[电子电信—信号与信息处理]