Dual way reference signal-based detection of digital LIA weak signals

Yang Chaosan; Zhang Tianqi; Pan Yi; Deng Ling

doi:10.13756/j.gtxyj.2013.06.003

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Dual way reference signal-based detection of digital LIA weak signals

- Dual way reference signal-based detection of digital LIA weak signals
- Study on Optical communication Issue 6, Pages: 42-45(2013)
- 作者机构：
  
  重庆邮电大学信号与信息处理重庆市重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2013.06.003
  CLC： TN722
- Published：2013，
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[1]杨超三,张天骐,潘毅,邓灵.基于双路正交实现数字锁定放大器的方法[J].光通信研究,2013(06):42-45.

Yang Chaosan, Zhang Tianqi, Pan Yi, et al. Dual way reference signal-based detection of digital LIA weak signals. [J]. (6):42-45(2013)
[1]杨超三,张天骐,潘毅,邓灵.基于双路正交实现数字锁定放大器的方法[J].光通信研究,2013(06):42-45. DOI： 10.13756/j.gtxyj.2013.06.003.

Yang Chaosan, Zhang Tianqi, Pan Yi, et al. Dual way reference signal-based detection of digital LIA weak signals. [J]. (6):42-45(2013) DOI： 10.13756/j.gtxyj.2013.06.003.

摘要

采用IQ（正交）双路参考信号实现数字LIA（锁定放大器）的微弱正弦信号的检测

利用稀疏分解将原子库的原子对作为参考信号

利用MP（匹配追踪）算法来搜索过完备原子库的最优原子对

并通过该原子对判断最佳相位角

从而合成最优原子。由该最优原子可以估计得到输入有用信号

从而检测估计出输入信号中的有用正弦信号。与单路数字LIA相比

该方法计算效率更高

计算速度亦成倍提高

且继承了单路数字LIA的优点。

Abstract

This paper introduces the detection of the weak sinusoidal signals of Lock-in Amplifiers（LIA）by using In-phase Quadrature（IQ）dual-way reference signals.It first uses the atom pairs of the atomic reservoir as the reference signals by sparse decomposition and searches for the optimal atom pair by using the Matching Pursuit（MP）algorithm.Then

it decides the best phase angle from this atom pair and thus synthesizes the optimal atom.From this optimum atom it obtains estimated useful input signals and detects the sine signals in the input signals.Compared with the single way digital LIA

this approach is better in computational efficiency as the computation speed is doubled and inherits the advantages of the former.

关键词

微弱信号检测锁定放大器稀疏分解匹配追踪算法

Keywords

weak signal detectionLIAsparse decompositionMP algorithm

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