GPS receiver
US4800577A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1987 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Jul 6, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0991
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A GPS receiver comprising a pseudonoise generator for simultaneously generating pseudonoise signals respectively corresponding to satellite electromagnetic waves transmitted from two or more satellites, an oscillator for simultaneously regenerating carrier waves of the plurality of satellite electromagnetic waves, and a plurality of demodulators responsive to the regenerated carrier waves and the pseudonoise signals to demodulate individual satellite electromagnetic waves independently, to thereby regenerate data transmitted from individual satellites, each demodulator being operative, during demodulation, to detect a set of phases of one pseudonoise signal and one regenerated carrier wave relative to one satellite electromagnetic wave on time division basis and including a first mixer for mixing of one pseudonoise signal, a second mixer for mixing of one regenerated carrier wave and a filter, whereby a set of phases of one pseudonoise signal and one regenerated carrier wave is changed to another set at timed relationship with transmission of data from individual satellites to measure a phase of one pseudonoise signal relative to one satellite electromagnetic wave, thereby tracking…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.