Local-area augmentation system for satellite navigation precision-approach system
US5786773A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Oct 2, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G5/54
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An aircraft local-area augmentation system that employs a differential global positioning system (GPS) to assist aircraft (102) landing is disclosed. One or more GPS ground stations (120), each including at least two GPS receivers (122) and a datalink transmitter (126), calculate and transmit GPS correction data to an aircraft (102). An aircraft (102) employs a GPS receiver (106) for receiving ranging signals (112) from GPS satellites (108), and a datalink receiver (116) for receiving GPS correction data and other information from a GPS ground station (120). The aircraft (102) further includes a data processor (110) for determining a global position of the aircraft (102) as a function of the aircraft GPS pseudorange data and the GPS correction data. The system minimizes the introduction of non-common errors by the use of double-differencing calculations using multiple combinations of satellite (108) and GPS ground station receiver (122). The system further comprises a method of transmitting a digital signature (626) from a GPS ground station (120) to an aircraft (102), in order to authenticate transmitted messages, thereby detecting spoofing. Messages transmitted from a GPS ground …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.