中国空间科学技术

中国空间科学技术

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卫星测控信号的调制类型自动识别算法

钟兴旺,陈豪,易克初   

  1. 西安空间无线电技术研究所,西安空间无线电技术研究所,西安电子科技大学 西安710000 ,西安710000 ,西安710000
  • 发布日期:2003-06-25

Automatic Modulation Recognition of TTC Signals of Satellite

Zhong Xingwang Chen Hao(Xi′an Institute of Space Radio Technology, Xi′an 710000 )Yi Kechu(Xidian University, Xi′an 710000)   

  • Online:2003-06-25

被引次数

5

摘要： 研究了应用于卫星测控信号的自动调制识别算法 ,提出了FM和PM测控信号识别的两种算法 ,分析并仿真验证了载频偏移对正确识别率的影响 ,研究了载频偏移估计算法对消除载频偏移影响的效果。计算机仿真实验表明 :在基于瞬时相位标准偏差σdp为关键特征的算法中 ,采用最小二乘原理估计频偏可以有效地消除载频偏移和部分噪声的影响 ;基于瞬时折叠相位偏差σlwp的算法在载频偏移为 1 0 0Hz,信噪比高于 - 6dB时 ,其识别率可达 1 0 0 %。

关键词: 信号识别, 调频, 调相, 算法

Abstract: This paper is about automatic modulation recognition of TTC(Tracking,Telemetry and Control)signals of satellites. The modulation schemes considered are FM and PM. Two algorithms are developed. The influence of carrier frequency offset on the probability of correct decision is considered and some carrier frequency excursion estimation algorithms are used to remove the influence. According to the computer simulation experiment, it is found that the least-squares algorithm is an effective method to remove the influence of carry frequency offset and part noise in the algorithm based on standard deviation of the direct value non-line component of instantaneous phase( σ dp ), and that the probability of correct decision is up to 100% in the algorithm based on standard deviation of the direct value of instantaneous warped phase( σ dwp ),when the signal-to-noise ratio is higher than negative 6dB at the presence of 100Hz carry frequency offset.