GPS receiver and mobile unit incorporating the same
US6590525B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2001 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Feb 22, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W76/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
GPS receiver (1) is disclosed together a mobile unit especially in the form of a mobile cellular telephone (30) incorporating the same. The GPS receiver (1) comprises a GPS signal antenna (10) for receiving externally transmitted GPS signals; an analogue-to-digital converter (11) coupled to the antenna for sampling the received GPS signals; a memory (12) for storing the GPS signal samples; and a digital GPS signal processor (13, 14) for retrieving pseudorange information from the GPS signal samples stored in the memory (12). The receiver (1) has a dormant mode of operation in which received GPS signals are sampled and stored in the memory (12) but the signal processor (13, 14) is not operative for retrieving pseudorange information, and an active mode of operation in which the signal processor (13, 14) is operative for retrieving pseudorange information. Also, the receiver (1) is arranged to change from the dormant mode to the active mode in response to a instruction received from external to the receiver (1) and made whilst the receiver (1) is operating in the dormant mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.