Frequency normalization utilizing GPS pulse time and time interv

Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment

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455 121, H04B 7185

Patent

active

057377154

ABSTRACT:
A local oscillator frequency measurement system for measuring the frequency of a local oscillator of an ESM receiver. The frequency measurement system includes a global positioning system (GPS) receiver (20) for providing a GPS pulse time and time interval signal; a threshold detector (45) responsive to the GPS pulse time and time interval signal for detecting pulses in the GPS pulse time and time interval signal for providing an output indicative of the occurrences of the pulses; a counter (41) clocked by the output of the local oscillator for providing a counter output; a latch (43) for sampling the counter output pursuant to detection of the pulses to provide sampled counts, whereby the sampled counts represent the outputs of the counter at the time the pulses are detected; and a processor (50) for processing the sampled counts to determine the frequency of the local oscillator.

REFERENCES:
patent: 5101416 (1992-03-01), Fentou et al.
patent: 5347285 (1994-09-01), MacDorau et al.

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