Multiplex communications – Wide area network – Packet switching
Patent
1988-09-27
1989-11-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
455 25, 342357, H04J 102, H04B 785
Patent
active
048797138
ABSTRACT:
A satellite-based vehicle communication/position determination system constituted by N (N.gtoreq.3) geostationary satellites, a plurality of vehicle stations for performing radio-wave exchange with the satellites using a low-directivity antenna, and a base station having high-directivity antennas for independently performing radio-wave exchange with the N geostationary satellites is disclosed. The base station has a communication FDM receiver, N chirp signal receivers for receiving and pulse compressing chirp signals from a vehicle station, which are obtained via the N geostationary satellites, and a circuit for determining the position of the vehicle station based on time differences of compressed pulses from the chirp signal receivers. Each vehicle station has a communication FDM receiver, a transmitter, a chirp signal generator, and a switching control circuit for controlling to selectively output a transmitting signal or the chirp signal.
REFERENCES:
patent: 4398286 (1983-08-01), Geesen et al.
patent: 4613864 (1986-09-01), Hofgen
patent: 4700374 (1987-10-01), Bini
patent: 4740792 (1988-04-01), Sagey et al.
patent: 4751512 (1988-06-01), Longaker
Jung Min
NEC Corporation
Olms Douglas W.
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