Sliding discrete Fourier transform based frequency-locked loop for adaptive carrier tracking of bi-phase signals

被引：3

作者：

Joshi, Udaya ^{[1
]}

Parasuraman, Sumathi ^{[1
]}

机构：

[1] Indian Inst Technol Roorkee, Dept Elect Engn, Roorkee 247667, Uttar Pradesh, India

来源：

IET COMMUNICATIONS | 2016年 / 10卷 / 18期

关键词：

frequency locked loops; tracking; Doppler shift; discrete Fourier transforms; filtering theory; signal sampling; frequency control; adaptive control; input frequency variation estimation; frequency error computation; carrier frequency estimated; adaptive sampling frequency control; SDFT quadrature component; SDFT in-phase component; closed-loop SDFT filter; phase spectra; magnitude spectra; biphase signals; adaptive carrier tracking method; sliding discrete Fourier transform based frequency-locked loop; GNSS RECEIVERS; POWER;

D O I：

10.1049/iet-com.2016.0043

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

For bi-phase signals, an adaptive carrier tracking method based on sliding discrete Fourier transform (SDFT) frequency-locked loop (FLL) is proposed. Magnitude and phase spectra of closed-loop SDFT filter provide almost flat response around the centre frequency. However, the small magnitude and phase errors observed at the SDFT in-phase and quadrature components are corrected by adaptive sampling frequency control. The carrier frequency is estimated by computing the frequency error. Hence, the input frequency variation due to Doppler shift could be estimated for the bi-phase signal. Experimental investigations with digital implementation demonstrate the suitability of the FLL for bi-phase signals.

引用

页码：2649 / 2655

页数：7

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