Signal acquisition with efficient doppler search
US7636383B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 2006 |
| Grant date | Dec 22, 2009 |
| Priority date | — |
| Expiry date | Dec 7, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7075
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A receiver for computationally efficient signal acquisition of spread-spectrum chips affected by Doppler shift in an advanced tactical data link. Received signals with a very low signal-to-noise ratio are parsed in a multi-stage signal acquisition circuit architecture, and compared to a known sequence to determine correlation over a subset of the known sequence. Chip-rate-coherent correlation is performed over an interval of time for which the effect of Doppler shift on the chip rate are negligible. A non-coherent block then integrates intermediate metrics to obtain final metrics for the entire known sequence. The parsing of the correlation into subsets and stages allows for a more computationally efficient solution to the Doppler shift chip rate error problem by reducing the number of intermediate metrics that must be computed at high speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.