Closed-loop autocorrelator and its application to fequency discrimination

H. Messer, H. Messer, Y. Bar-Ness, Y. Bar-Ness

פרסום מחקרי: פרסום בכתב עתמאמרביקורת עמיתים

תקציר

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). A detailed 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.

שפה מקוריתאנגלית
עמודים (מ-עד)25-33
מספר עמודים9
כתב עתIEE Proceedings, Part F: Communications, Radar and Signal Processing
כרך133
מספר גיליון1
מזהי עצם דיגיטלי (DOIs)
סטטוס פרסוםפורסם - 1986
פורסם באופן חיצוניכן

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