Signal detector and method employing a coherent accumulation system to correlate non-uniform and disjoint sample segments
US6850557B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 2000 |
| Grant date | Feb 1, 2005 |
| Priority date | — |
| Expiry date | Apr 18, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0034
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A signal detector employs a coherent accumulation system that coherently combines the correlation results derived from segments of samples of a received signal. The segments may have non-uniform lengths and may have been obtained over different and non-overlapping time periods. The segments are obtained during sampling windows of arbitrary length and at arbitrary times, and the results of processing the segments are successively combined in a coherent manner (separate magnitude and phase accumulation) until a threshold signal-to-noise ratio (SNR) has been achieved. Coherent integration is enabled by introducing a carrier phase offset as well as a code phase offset, so that different segments are aligned in carrier phase as well as code phase. Although not limited to this application, in one implementation example, the signal detector is used in connection with and as part of a global positioning system (GPS) receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.