| 摘要: |
| 针对卫星导航P码直捕运算量大、消耗硬件资源大的问题，提出了一种基于TDMA
思想的P码直捕方法。该方法在匹配滤波器结合FFT方法的基础上，以串并结合、分时处理的
方式实现了码域的搜索，以全并行的方式实现了频域的搜索，且不需外挂SDRAM。详细介绍
了该方法的实现过程，并给出了仿真实验结果。分析表明，该方案能以较低的资源完成P码
的直接捕获。 |
| 关键词: 卫星导航 时分多址 直接序列扩频 快速傅里叶变换 分段匹
配滤波器 快速捕获 |
| DOI： |
|
| 基金项目: |
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| Realization of satellite navigation P code direct acquisition based on TDMA |
| NONG Xiao-dong,HUANG Zhi-gang,GENG Sheng-qun,YANG Zai-xiu |
| (School of Electronic and Information Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China) |
| Abstract: |
| To solve the problem of large resource consume of satellite navigation
P code direct acquisition, a method based on TDMA and partial matched filter ban
k with Fast Fourier Transform(FFT) is presented. The method combines parallel an
d serial search in code domain, and complete parallel search in frequency domain
. Besides, the method doesn′t need SDRAM. Theory of the method of partial match
ed filter bank with Fast Fourier Transform(FFT) is deduced, and the simulation i
s implemented. The analysis result indicates that the method can reduce the reso
urce consume to fulfill the direct P code acquisition. |
| Key words: satellite navigation TDMA DSSS FFT partial matched filter quick acquisition |
