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- Title
星载 AIS 信号的频偏估计.
- Authors
马社祥; 陈明; 孟鑫; 王俊峰
- Abstract
In a satellite-based automatic identification system(AIS), demodulation of signal is affected by serious Doppler frequency offset, while the traditional frequency estimation algorithm based on fast Fourier transform(FFT) can not satisfy the need. To solve the problem,an improved self-correlation-FFT algorithm is proposed. The sign of frequency offset is determined by auxiliary function. The improved algorithm is obtained on the basis of frequency offset estimation algorithm based on FFT and sign of frequency offset, and it enlarges the frequency offset estimation range and realizes the large Doppler frequency offset estimation. The simulation and experimental results show that the frequency offset estimation range of the improved algorithm is twice times of the original. The improved algorithm, with high estimation precision, is simple and easy to implement and its estimated performance is very close to the modified Cramer-Rao bound(CRB).
- Publication
Telecommunication Engineering, 2017, Vol 57, Issue 12, p1388
- ISSN
1001-893X
- Publication type
Article
- DOI
10.3969/j.issn.1001-893x.2017.12.007