Rapid acquisition and correlation of synchronization codes for mobile devices with limited memory and computational power
US7692587B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2004 |
| Grant date | Apr 6, 2010 |
| Priority date | — |
| Expiry date | Dec 5, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/658
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a method, system, and apparatus for rapidly acquiring and correlating synchronization codes for a mobile receiver used for position determination purposes. The receiver uses a processing unit to perform the correlation functions. The processing unit first computes, for each segment interval of the received signal, the phase offset of that interval. Each interval is appropriately adjusted to account for the computed phase offset. The processing unit then accumulates the phase-adjusted segment intervals, and may down-convert the accumulated signal to a baseband format from an intermediate frequency. The processing unit then correlates the accumulated signal with a reference signal to produce a correlation peak, from which the time delay of a synchronization code within the interval can be calculated. Ultimately, the receiver's position can be determined based on the calculated time delay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.