Frequency normalization utilizing GPS pulse time and time interval signal
US5737715A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1996 |
| Grant date | Apr 7, 1998 |
| Priority date | — |
| Expiry date | Apr 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.