Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-05-22
1984-04-24
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343356, H04B 7185
Patent
active
044451180
ABSTRACT:
In a global positioning system (GPS), such as the NAVSTAR/GPS system, wherein the position coordinates of user terminals (14) are obtained by processing multiple signals transmitted by a constellation of orbiting satellites (16), an acquisition-aiding signal generated by an earth-based control station (12) is relayed to user terminals via a geostationary satellite (10) to simplify user equipment. The aiding signal is FSK modulated on a reference channel slightly offset from the standard GPS channel. The aiding signal identifies satellites in view having best geometry and includes Doppler prediction data as well as GPS satellite coordinates and identification data associated with user terminals within an area being served by the control station (12) and relay satellite (10). The aiding signal significantly reduces user equipment by simplifying spread spectrum signal demodulation and reducing data processing functions previously carried out at the user terminals (14).
REFERENCES:
patent: 3384891 (1968-05-01), Anderson
patent: 3430234 (1969-02-01), Wright
patent: 3471856 (1969-10-01), Laughlin
patent: 3544995 (1970-12-01), Bottenberg
patent: 3641433 (1972-02-01), Mifflin et al.
patent: 3763492 (1973-10-01), Easton
patent: 3789409 (1974-01-01), Easton
patent: 3852750 (1974-12-01), Klein
patent: 3906204 (1975-09-01), Rigdon
"Spread Spectrum Systems," R. C. Dixon, John Wiley & Sons, New York, 1976, pp. 186-188.
Sennott James W.
Taylor Ralph E.
Blum Theodore M.
Manning John R.
Sandler Ronald F.
The United States of America as represented by the Administrator
Tresansky John O.
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