Closed-loop autocorrelator and its application to frequency discrimination
作者:
H.Messer,
Y.Bar-Ness,
期刊:
IEE Proceedings F (Communications, Radar and Signal Processing)
(IET Available online 1986)
卷期:
Volume 133,
issue 1
页码: 25-33
年代: 1986
DOI:10.1049/ip-f-1.1986.0006
出版商: IEE
数据来源: IET
摘要:
A new closed-loop autocorrelation system is proposed in the paper. It is based on a conventional autocorrelator; however, the fixed delay is replaced by a variable delay line and the autocorrelator output is fed back to control the delay. The variable delay can be realised by a SAW voltage-controlled variable delay line (VCDL). Adetailed analysis of the loop is given. It is shown that for some special inputs, the loop performs as a frequency-measuring system, as an instantaneous frequency measurement (IFM) or as a wideband linear FM discriminator. It is further shown that, in the presence of noise, the loop behaves similarly to a frequency modulation feedback (FMFB) loop. Therefore, the output SNR can be improved (in comparison with conventional FM discriminators) by appropriately choosing the loop parameters. Experimental results of a system implemented using an SAW VCDL are presented and are shown to support the analysis.
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