摘要
针对微弱GPS信号的高灵敏度检测算法是当前遮蔽环境下GPS软件接收机捕获信号亟待解决的问题.作者提出了基于FFT块处理的1/4字节步进相干积分检测方法,较传统的1/2字节更替检测方法,增长了相干积分区间,更有效地利用了GPS信号,提高了微弱GPS信号的检测灵敏度,缩短了捕获时间.仿真结果表明,在信号长度不超过300 ms的情况下,该算法能成功捕获信号强度低至24 dB-Hz的微弱GPS信号.
In this paper, a new acquisition method of weak GPS signal based on FFT block process is studied. Compared with traditional alternate halfbit coherent integration method, new method is more effective and timesaving,while less amount of GPS data is needed. Simulation experiment result shows that,through at most 300 ms GPS data,new acquisition method can acquire weak GPS signal at the 24 dBHz level of CNO power.
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第3期494-498,共5页
Journal of Sichuan University(Natural Science Edition)
基金
国家自然科学基金(0020105401118)
关键词
微弱GPS信号检测
FFT块处理
相干积分
acquisition of weak GPS signal, FFT block process, coherent integration
