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Proceedings Paper

Frequency offset correction procedure using signals of opportunity for calibrating non-DF-quality receivers
Author(s): Peter F. Jones; Andy Tenne-Sens
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Paper Abstract

Conventional phased-array antenna schemes operate by combining the signals from individual antennas in an array. Normally, the signals are passed through receivers with common local oscillators to ensure phase coherence prior to signal weighting and combination. With an appropriate delay added to each signal path, the weights can be adjusted to emphasize the signal that one of attempting to receive while minimizing the contributions from intentional or unintentional jammers. By applying DSP techniques to the signals after downconversion in receivers that do not share local oscillators, it is possible to detect differences in local oscillator frequency and then `virtually' phase-lock the signal streams together. In order to detect the local- oscillator offsets between receivers, we have proposed and experimentally demonstrated a correlation method using received `signals of opportunity' available from the antenna array. Examples of `signals of opportunity' are time beacons, radio broadcasts and even external noise. By comparing the signals from both receivers, it is possible to determine the relative frequency offset between them. We present both the theory of operation of this technique as well as experimental results.

Paper Details

Date Published: 26 July 2000
PDF: 11 pages
Proc. SPIE 4045, Digital Wireless Communication II, (26 July 2000); doi: 10.1117/12.394088
Show Author Affiliations
Peter F. Jones, Neptec Communications (Canada)
Andy Tenne-Sens, Communications Research Ctr. (Canada)

Published in SPIE Proceedings Vol. 4045:
Digital Wireless Communication II
Raghuveer M. Rao; Soheil A. Dianat; Michael D. Zoltowski, Editor(s)

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