Satellite-based vehicle position determining system

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

343100ST, 343112TC, G01S 1378

Patent

active

043597335

ABSTRACT:
A system for determining the positions of a plurality of vehicles traveling on or above a defined sector of the earth's surface comprises a transponder carried by each vehicle for transmitting a uniquely coded beacon signal in response to a general interrogation signal, at least three repeater-carrying satellites at spaced orbital locations above the earth for receiving and retransmitting the beacon signals produced by the vehicles, and a ground station for periodically transmitting the general interrogation signal and for receiving and processing the beacon signals retransmitted by the three satellites in order to determine vehicle position. In order to avoid signal overlap and equipment saturation at the ground station, each vehicle transponder includes means responsive to the general interrogation signal for inhibiting the transmission of further beacon signals by the transponder for a predetermined time interval following the response of the transponder to the general interrogation signal. In a preferred embodiment of the invention, the inhibited interval of the vehicle transponders may be varied automatically in response to a command signal transmitted by the ground station.

REFERENCES:
patent: 2972742 (1961-02-01), Ross
patent: 3047861 (1962-07-01), Arnold et al.
patent: 3141167 (1964-07-01), Sandretto
patent: 3153237 (1964-10-01), Lakatos
patent: 3209357 (1965-09-01), Wyatt
patent: 3384891 (1968-05-01), Anderson
patent: 3430234 (1969-02-01), Wright
patent: 3495260 (1970-02-01), Laughlin et al.
patent: 3497807 (1970-02-01), Newton
patent: 3534367 (1970-10-01), Laughlin et al.
patent: 3544995 (1970-12-01), Bottenberg et al.
patent: 3560975 (1971-02-01), Manuali
patent: 3665464 (1972-05-01), Meilander
patent: 3668403 (1972-06-01), Meilander
patent: 3742498 (1973-06-01), Dunn
patent: 3789409 (1974-01-01), Easton
patent: 3836970 (1974-09-01), Reitzig
patent: 3852750 (1974-12-01), Klein
patent: 3852763 (1974-12-01), Kreutel, Jr. et al.
patent: 4114155 (1978-09-01), Raab
patent: 4161730 (1979-07-01), Anderson
R. E. Anderson, "A Navigation System Using Range Measurements from Satellites with Cooperating Ground Stations", Journal of the Institute of Navigation, vol. 11, No. 3, pp. 315-334 (Fall 1964).
J. W. O'Grady et al., "ATCRBS Trilateration: The Advanced Airport Surface Traffic Control Sensor", AGARD Conference Proceedings (No. 188) on Plans and Developments for Air Traffic Systems (Cambridge, Massachusetts, May 20-23, 1975).
G. David, "Digital Airborne Equipment for AEROSAT", Philips Telecommunication Review, vol. 32, No. 4, pp. 225-236.
H. Hoffman, Jr., "Space Vehicle Electromagnetic Communications and Tracking", Rome Air Development Center, Griffis Air Force Base, New York, pp. 227-239.
Excerpts from NASA Report describing proposals for communications and/or navigation systems involving satellites (citation unavailable).
"NAVSTAR Plan is Not so Bright in FAA's Eyes", North Atlantic Aviation, 1980 (specific volume and date citation unavailable).
G. K. O'Neill, "Making the Skies Really Safe", Washington Post, Mar. 5, 1979, p. A-21.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Satellite-based vehicle position determining system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Satellite-based vehicle position determining system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Satellite-based vehicle position determining system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1438097

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.