Digital frequency measurement receiver with bandwidth improvement through multiple sampling of complex signals
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United States of America Patent
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Mar 24, 1992
Grant Date -
N/A
app pub date -
Mar 6, 1991
filing date -
Mar 6, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This is a technique for extending the frequency range which employs in-phase and quadrature components of the signal coupled with non-uniform sampling to gain the advantages of a high sampling rate with only a small increase in the number of samples. By shifting the phase of the local oscillator by 90 degrees, a quadrature IF signal can be generated. Both in-phase and quadrature components are sampled and the samples are combined to form a complex signal. When this signal is transformed, only one alias is obtained per periodic repetition and the effective Nyquist frequency is doubled. Two sets of complex samples are then used with the slightly different sampling frequency. Each set is independently Fourier transformed and the frequency of the lowest aliases permits unambiguous determination of the signal frequency over a range far exceeding the Nyquist frequency.
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