摘要
讨论了大多普勒条件下时频二维搜索伪码捕获原理,并结合基于DSP的硬件实现平台,提出了一种基于FFT的频域串行一伪码并行捕获的改进方法,通过存储一个频点本地码匹配滤波器的傅立叶变换,采用频域循环移位的多通道软切换,简化捕获处理,缩短捕获时间,实验结果表明具有很好的捕获性能。
The principles of pseudorandom code acquisition on time-frequency 2D searching are discussed under the large Doppler shift conditions. And on the platform based on DSP, an improved method of frequency serial-code parallel acquisition based on FFT is proposed. By saving the FFT transform results of the local code matchfilter in one channel, the multi-channel soft hardoff is implemented with the cyclic shift in the frequency demain. Experimental results show that the method has good acquisition performance.
出处
《数据采集与处理》
CSCD
北大核心
2006年第B12期105-108,共4页
Journal of Data Acquisition and Processing
关键词
扩频码
捕获
多普勒频移
FFT
spread-spectrum code
acquisition
Doppler shift
FFT
