Frequency offset estimation in the intermediate frequency for satellite-based AIS signals

被引：0
|
作者：
孟鑫 [1 ,2 ]
马社祥 [3 ]
刘琛 [3 ]
滕建辅 [1 ]
机构：
[1] School of Electronic Information Engineering, Tianjin University
[2] Maritime College, Tianjin University of Technology
[3] School of Electrical and Electronic Engineering, Tianjin University of Technology
来源：
Optoelectronics Letters | 2018年 / 14卷 / 04期
基金：
中国国家自然科学基金;
关键词：
AIS; Frequency offset estimation in the intermediate frequency for satellite-based AIS signals;
D O I：
暂无
中图分类号：
U675.7 [船舶导航与通信]; V443 [电子设备];
学科分类号：
08 ; 081105 ; 0825 ;
摘要：
In this paper, an accurate frequency offset estimator is investigated in the intermediate frequency for the satellite-based automatic identification system(AIS) signals. Using Gaussian minimum shift keying(GMSK) modulation for transmission, the AIS signal is shown to be a plane wave with the modulated phase information and carrier frequency resulting from the Doppler effects. Hence, the phase information can be eliminated with a re-modulated signal, and the frequency offset can be estimated by the ratio of the maximum spectral amplitude and its neighbor spectral amplitude based on the fast Fourier transformation(FFT) interpolation. The estimator has low complexity, and it is easy to implement. Computer simulations are used to assess the performance of the estimator.
引用
收藏
页码：301 / 305
页数：5
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