Low power GPS receiver
US5650785A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1994 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | Nov 1, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A low power GPS receiver, including an RF section to receive a GPS signal having information for determining a location fix and to issue an IF signal, a correlator system to correlate an internal replica signal to the IF signal and to issue a correlation signal including location and signal strength information, a microprocessor system to receive the correlation signal, to read the signal strength, and to provide a location fix, and an on/off modulator to receive a duty cycle factor from the microprocessor system and to on/off modulate the operating power to the RF section to provide a minimum signal strength for a valid location fix. The off time duration of the modulation is shorter than the time duration of the interval used to correlate the IF signal enabling the GPS receiver to continue to correlate the IF signal and to provide the location fixes while the RF section operating power is reduced by the duty cycle factor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.