Digital spread spectrum GPS navigation receiver
US5943363A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1996 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Jul 17, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/37
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed are digital processing techniques for efficiently receiving, sampling and recovering multiple direct-sequence spread-spectrum signals by multiplexing key signal processing elements across many logical channels. Global Positioning System (GPS) receivers serve to illustrate the technique. They receive many signals, each with independent timing, phase, amplitude, and data modulation, which may arrive on multiple carrier frequencies and at multiple spreading rates. To employ digital processing techniques, the carrier or carriers are reduced to one or more digital sample streams. Digital processing (e.g., products, sums, decisions, etc.) is then used to estimate, or recover, the received signal and its characteristics. When these functions can be partitioned by processing rate, the usual case, the lower-rate functions can be efficiently shared with negligible efficiency loss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.