Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1996-12-06
1999-11-30
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
34235704, 701215, H04B 7185, G01S 502
Patent
active
059950439
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.
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Blum Theodore M.
The Boeing Company
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