High-accuracy parameter estimation algorithm for spread spectrum signal in LEO satellite communication

JIN Lei; ZENG Fuhua; GU Liyan; WANG Yuan

doi:10.11959/j.issn.1000-0801.2025105

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High-accuracy parameter estimation algorithm for spread spectrum signal in LEO satellite communication

Research and Development | 更新时间：2025-06-28

- High-accuracy parameter estimation algorithm for spread spectrum signal in LEO satellite communication
- Telecommunications Science Vol. 41, Issue 6, Pages: 70-80(2025)
- 作者机构：
  
  中国西南电子技术研究所，四川成都 610036
- 作者简介：
- 基金信息：
- DOI：10.11959/j.issn.1000-0801.2025105
  CLC： TN914.4
- Received：23 December 2024，
  
  Revised：2025-03-26，
  
  Published：20 June 2025
- 稿件说明：
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金磊,曾富华,古礼衍等.LEO卫星扩频信号的高精度参数估计方法[J].电信科学,2025,41(06):70-80.

JIN Lei,ZENG Fuhua,GU Liyan,et al.High-accuracy parameter estimation algorithm for spread spectrum signal in LEO satellite communication[J].Telecommunications Science,2025,41(06):70-80.
金磊,曾富华,古礼衍等.LEO卫星扩频信号的高精度参数估计方法[J].电信科学,2025,41(06):70-80. DOI： 10.11959/j.issn.1000-0801.2025105.

JIN Lei,ZENG Fuhua,GU Liyan,et al.High-accuracy parameter estimation algorithm for spread spectrum signal in LEO satellite communication[J].Telecommunications Science,2025,41(06):70-80. DOI： 10.11959/j.issn.1000-0801.2025105.

摘要

低地球轨道（low earth orbit，LEO）卫星具有发射成本低、传输时延低、链路损耗小、数据传输速率高等优势，但卫星高速运动形成的多普勒效应、随遇业务造成的测控时间短都会导致扩频信号在大多普勒频移范围内高精度参数估计难。对此，提出了一种插值校正伪码相位/载波频率的高精度参数估计方法，首先采用相关积分峰与自适应检测门限进行检测判决，得到相关积分峰/旁峰及其伪码相位/载波频率指数；其次采用伪码自相关三角几何关系插值校正伪码相位，并使用相关积分峰抛物线拟合法插值校正载波频率。实验与分析结果表明：所提方法在载波多普勒频移±25 kHz下伪码相位估计精度优于0.05 chip、载波频率估计精度优于50 Hz，显著提升了LEO卫星测控系统高动态扩频信号的伪码相位/载波频率估计精度。

Abstract

The low earth orbit (LEO) satellite has advantages of the low launch cost

the short transmission delay

the small link loss and the high data rate. But the Doppler effect caused by high-speed satellite and the short TT&C (telemetry

tracking and command) time caused by random service lead to the difficulty of the high-accuracy parameter estimation for spread spectrum signal with large Doppler frequency shift. A high-accuracy parameter estimation algorithm for spread spectrum signal based on interpolated correct pseudo-code phase and carrier frequency was proposed. Firstly

the comparative detection with correlation integral peak and adaptive detection threshold was employed to acquire correlation integral peak/side-peak and its pseudo-code phase/carrier frequency index. Then

the trigonometric geometry relationship of pseudo-code autocorrelation was applied to interpolate the correct pseudo-code phase

and the parabola fitting method of correlation integral peak was used to interpolate the correct carrier frequency. The experiments and analysis verify that the proposed algorithm can achieve the pseudo-code phase estimation accuracy better than 0.05 chip and the carrier frequency estimation accuracy better than 50 Hz with ±25 kHz carrier Doppler frequency shift

and significantly improve the pseudo-code phase and carrier frequency estimation accuracy of high dynamic spread spectrum signal in LEO satellite TT&C systems.

关键词

Keywords

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