Method and apparatus for calculating pseudorange for use in ranging receivers
US6466164B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2001 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Sep 10, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system, apparatus, and corresponding method for measuring a pseudorange from a ranging receiver to a beacon (such as a GPS satellite). It determines the time of transmission of a target ranging signal fragment (for which the difference in time between transmission and reception is essentially the pseudorange) even in poor signal conditions when the navigation data of the ranging signal cannot be accurately decoded by the ranging receiver. It is based on making either an estimate of the start time for the particular information element of the ranging signal (usually a navigation data bit) beginning just before the target ranging signal fragment (if the quality of the ranging signal allows such an estimate to be made), or (in any case) based on making an estimate of the time corresponding to the start of the code epoch of the ranging signal that just precedes the target ranging signal fragment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.