Adjusting the timing and synchronization of a radio's oscillator with a signal from an SATPS satellite
US5970400A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1996 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Apr 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication system is provided for increasing communication range between at least two radio communication devices without increasing the output power of transmitted radio signals from the devices, and without increasing the antenna gain of the received signals. Each radio device includes an oscillator for generating a carrier reference signal, and an SATPS receiver which receives at least one standard timing reference signal from at least one SATPS satellite. The received standard timing reference signal is used to continuously adjust the timing and synchronization of the oscillator to improve the accuracy of the carrier frequency signal. The improved accuracy in the carrier frequency signal may then be used to reduce the bandwidth of the modulated carrier frequency signals generated by the radio device to thereby increase the effective communication range and sensitivity of the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.