Aircraft satellite navigation precision-approach system including CDMA datalink
US5995043A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1996 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Dec 6, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/46
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An aircraft local area augmented landing assistance 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 one GPS receiver (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 from a GPS ground station (120). The ground station datalink transmitter (126) employs code division multiple access spread spectrum techniques to transmit a datalink signal (128) that is QPSK modulated within the VHF navigation band. The datalink signal (128) is additionally used as a ranging signal by the aircraft, to augment the differential GPS.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.