Method and apparatus for autonomously measuring ionospheric delay and single-frequency, GPS time receiver incorporating same
US6407700B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Dec 5, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The ionospheric delay of a GPS signal transmitted by a first satellite having an obliquity is measured autonomously and substantially in real-time by receiving a code range, a carrier phase range and a satellite elevation angle for each of at least two satellites. For each of the at least two satellites, a code-phase divergence between the code range and the carrier phase range is calculated, an obliquity is calculated from the satellite elevation angle and time derivatives of the code-phase divergence and of the obliquity are calculated. A zenith delay is calculated from the obliquities, the time-derivatives of the obliquities and the time-derivatives of the code-phase divergences of the at least two satellites. The ionospheric delay is calculated by multiplying the obliquity of the first satellite and the zenith delay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.