Method for instantaneous frequency measurement
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United States of America Patent
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Aug 13, 2002
Grant Date -
N/A
app pub date -
Jul 25, 1995
filing date -
Jul 25, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention discloses a method of instantaneous frequency measurement. The frequency band of interest is divided into a number of virtual sub-bands. Each sub-band is folded into a common baseband by a band folding down converter. Frequency measurement is achieved in a two part process, part 1 determines the center frequency of the virtual sub-band, while part 2 determines the baseband frequency, the frequency within the virtual sub-band. Both components of the RF frequency are then combined to form the frequency measurement. The frequency determinations for both sub-band frequency and baseband frequency are made by digital processing of the baseband phase measurements. The baseband phase is measured by a multi bit phase sampler, an integral part of the invention.
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