Frequency offset correction procedure using signals of opportunity for calibrating non-DF-quality receivers

Peter F. Jones; Andy Tenne-Sens

doi:10.1117/12.394088

26 July 2000 Frequency offset correction procedure using signals of opportunity for calibrating non-DF-quality receivers

Peter F. Jones, Andy Tenne-Sens

Author Affiliations +

Proceedings Volume 4045, Digital Wireless Communication II; (2000) https://doi.org/10.1117/12.394088
Event: AeroSense 2000, 2000, Orlando, FL, United States

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.

Citation Download Citation

Peter F. Jones and Andy Tenne-Sens "Frequency offset correction procedure using signals of opportunity for calibrating non-DF-quality receivers", Proc. SPIE 4045, Digital Wireless Communication II, (26 July 2000); https://doi.org/10.1117/12.394088

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