非相干扩频信号捕获算法研究和实现
Research and implementation of incoherent spread spectrum signal acquisition algorithm
曾艳文 1胡一皓 2刘才瑞 2王晋阳 2梁显锋 2刘守印1
作者信息
- 1. 华中师范大学物理科学与技术学院,武汉 430079
- 2. 中国科学院国家空间科学中心,北京 100190
- 折叠
摘要
研究了一种非相干扩频信号的捕获算法,用于星载S波段非相干扩频应答机实现一路遥控信号和四路测距信号的快速捕获.捕获单元采用并行FFT技术和分块-双倍补零技术实现对1kHz相干测距信号和2kHz非相干遥控信号的相关积分运算,在保证捕获性能条件下抑制了数据跳变,对积分结果利用两级门限检测判决技术降低误捕概率,最后加入捕获验证算法抑制旁瓣干扰.仿真和测试结果表明,捕获单元能够抑制数据翻转,实现多通道相干和非相干扩频信号的快速捕获,且单通道捕获时间小于2s.
Abstract
An acquisition algorithm of incoherent spread spectrum signal is studied,which is used for the fast acquisition of one-channel remote control signal and four-channel ranging signal of satellite-borne S-band incoherent spread spectrum transponder.The acquisition unit uses parallel FFT technology and block-double zero-compensation technology to realize the correlation integration operation of 1 kHz coherent ranging signal and 2kHz non-coherent remote control signal,which suppresses the data jump under the condition of ensuring the acquisition performance,and uses two-stage threshold detection and judgment technology to re-duce the probability of false acquisition for the correlation integration results,and finally adds the acquisi-tion verification algorithm to suppress the side lobe interference.The simulation and test results show that the acquisition unit can suppress data overturn,achieve fast acquisition of multi-channel coherent and inco-herent spread spectrum signals,and the single-channel capture time is less than 2s.
关键词
非相干扩频/并行FFT/分块-双倍补零/数据翻转/多通道Key words
incoherent spread spectrum/parallel FFT/blocking-double zero filling/data flip/multiple channels引用本文复制引用
基金项目
国家重点研发计划(2021YFC2800203)
出版年
2024
NETL
NSTL
万方数据