Weak signal and anti-jamming Global Positioning System receiver and method using full correlation grid
US6724343B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2003 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Apr 24, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a system and method for increasing the weak signal recovery capability of a Global Positioning System (GPS) receiver correlating each of the plurality of digital signals by multiplying the I and Q phases by the carrier and code, adding a location offset, accumulating the results of the correlation, and latching the results until a predetermined time; coherent combining the accumulated results at the predetermined time; non-coherent combining the coherent combined results for a time period sufficient to raise a correlation peak to a predetermined point above a noise floor to produce a plurality of non-coherent bin observables; determining a maximum value of the plurality of bin observables and comparing the maximum value to predetermined threshold; determining grid locations of bin observables having maximum values greater than the predetermined threshold; determining a bi-quadratic surface using the grid locations; determining an argument maximum of the bi-quadratic surface; estimating epoch pseudorange and Doppler variables based on the argument maximum; estimating errors in at least one of position, velocity, orientation, user clock, frequency, and ionosphere states …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.