Global positioning system receiver with improved radio frequency and digital processing
US4928106A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1988 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Jul 14, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/37
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A global positioning system (GPS) receiver having a common radio frequency section and a separate digital signal processing channel for each of a plurality of satellite signals which are simultaneously being received and processed by the receiver in order to calculate the position, velocity or other desired parameters of the receiver. The radio frequency section receives and processes both of the standard satellite signals on different frequency L1 and L2 carriers in order to provide the multi-channel digital section signals from which the relative phase of the carriers from each of the plurality of satellites may be determined. Particular mutually coherent local oscillator and digital clock frequencies are selected in order to minimize the complexity of the receiver without creating any undesired side effects. A high resolution relative phase measurement is made in each digital section by averaging the number of phase shifting pulses over a period of time that are generated by a phase locked loop that is locked onto an L-band carrier frequency, that average incremental phase being added to a base phase measurement obtained simultaneously in each of the digital processing channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.