摘要
针对卫星导航定位系统中大多普勒低信噪比下长PN码快速捕获的难点,提出一种时频二维联合搜索快速捕获的改进方法,采用了合理的捕获策略和频域循环移位的多通道软切换,简化了捕获处理,利用多相结构的码相位搜索,降低了运算复杂度。该方法在TI公司TMS320C6416为核心器件的硬件平台上实现,仿真和实验结果表明其具有很好的捕获性能。
According to the Long PN Code with large Doppler shift in Low SNR Environment, an improved method of carrier-frequency and code start-point planar search is proposed. Through cycle shift in frequency space, the transformation between several frequency channels is implemented. Using the code search based on multi-phase structure, the calculation complexity was reduced. The platform device is set up with TMS320C6416, and the simulation result demonstrates that this method has better acquisition performance.
出处
《计算机应用》
CSCD
北大核心
2007年第4期1017-1019,1022,共4页
journal of Computer Applications
关键词
扩频码
捕获
多普勒频移
FFT
spread-spectrum code
acquisition
Doppler shift
FFT
