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- W2028328071 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.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only." @default.
- W2028328071 created "2016-06-24" @default.
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- W2028328071 date "2000-07-26" @default.
- W2028328071 modified "2023-09-26" @default.
- W2028328071 title "<title>Frequency offset correction procedure using signals of opportunity for calibrating non-DF-quality receivers</title>" @default.
- W2028328071 doi "https://doi.org/10.1117/12.394088" @default.
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