摘要
分析了影响GPS信号捕获灵敏度的因素,提出了减小相干损耗、降低噪声功率等实现高灵敏度信号捕获的技术途径;研究了相干损耗对灵敏度的影响,提出了高灵敏度捕获的搜索步长选择方案;研究了相干积分和非相干积分的信噪比增益,提出了相干积分+非相干积分的信噪比增加方案;进行了信号捕获仿真,仿真结果表明,所提出的技术途径可行,能够实现对30dB-Hz的低信噪比信号的捕获。
The factors which affect GPS signal acquisition sensitivity were analyzed. Some signal acquisition techniques with high sensitivity such as reducing wastage and noise power were proposed. In addition, the influence of wastage on sensitivity was studied; The selection scheme of search step in high sensitivity signal acquisition was also presented. Furthermore, the SNR gain of correlative and non-correlative integral was studied. An approach which combines correl- ative and non-correlative integral was provided to increase SNR. Finally, the simulation of signal acquisition was carried out. The results demonstrate that the techniques proposed in this paper are feasible; with these techniques such low SNR signal as 30dB-Hz can be acquired successfully.
出处
《弹箭与制导学报》
CSCD
北大核心
2009年第4期25-28,共4页
Journal of Projectiles,Rockets,Missiles and Guidance
关键词
高灵敏度
GPS
信号捕获
high sensitivity
GPS
signal acquisition
