一种长周期扩频码快速捕获算法  

Fast Acquisition of Long Cycle Pseudo-Random Code

作　　者：赵贤 张祎文 ZHAO Xian;ZHANG Yiwen(Southwest China Research Institute of Electronic Equipment,Chengdu 610036,China)

机构地区：[1]中国电子科技集团公司第二十九研究所,成都610036

出　　处：《电子信息对抗技术》2022年第3期51-56,共6页Electronic Information Warfare Technology

摘　　要：提出用于卫星导航接收机的长周期扩频码频域并行捕获算法,利用多个具有特定频率差和初始相位差的频率信号合成新的本振对接收信号进行载波剥离,实现更宽频带的并行搜索。在此基础上设计基于频率合成算法和FFT圆周卷积算法的时频二维联合并行捕获算法电路结构,给出该算法的工作流程,仿真表明该算法不仅进一步缩短首次定位时间,而且在低信噪比下能够保持较高的检测概率。A new frequency domain parallel search method of long cycle Pseudo-Random code is proposed and analyzed,which uses multiple frequency signals with given frequency and phase difference to generate a new local oscillator.By multiplying the received signal with this oscillator,a much wider range of frequency uncertainty is searched compared with traditional methods.A fast two-dimensional acquisition circuit is developed based on this method.Simulations show that this algorithm can shorten the TTFF(Time To First Fix)while maintaining high detection probability under low SNR conditions.

关 键 词：二维捕获 相干积分 相干损耗 检测概率 

分 类 号：TN967.1[电子电信—信号与信息处理]