Radio frequency sharing methods for satellite systems

Details Radio frequency sharing methods for satellite systems Radio frequency sharing methods for satellite systems

1996-08-26

1999-07-20

Le, Thanh Cong

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455430, 455454, 455 131, H04B 7185

Patent

active

059267585

ABSTRACT:
Methods and apparatus are disclosed which allow many satellites (A1-M, B1-N) in a plurality of Systems (A, B) to use the same radio frequencies (f1-n) so long as there is no interference between radio signals. The methods compute times (t) when satellite radio signals (32, 36) have overlapping reception areas or "footprints" (30, 35) on the Earth's surface (E) whereby a user's reception or transmission of a message would be interfered unless different frequencies (f1-n) are used for the "competing" signals. The methods use a timing algorithm that does not allow two satellites (Ai, Bi) which are "visible" at the same point on the Earth (E) to transmit on the same frequency (fi). In one preferred embodiment, a timing algorithm (48) produces a radio frequency use schedule (49) computed on the Earth from orbital data maintained in an ephemeris (46) of satellite communications systems (A, B) which communicate on frequencies (f1-n) giving rise to interfering radio signals. The radio frequency use schedule (49) is updated frequently, and is transmitted to and stored on board each satellite in System A (A1-M). System A satellites (A1-M) are then operated in accordance with the radio frequency use schedule (49).

REFERENCES:
patent: 5276908 (1994-01-01), Koohgoli et al.
patent: 5367304 (1994-11-01), Jan et al.
patent: 5566354 (1996-10-01), Sehloemer
patent: 5641134 (1997-06-01), Vatt
patent: 5669062 (1997-09-01), Olds et al.
"Sharing Between Main Beam Downlink LEO and UpLink GSO Satellites in the 1-3 Gttz Allocation" by Knudsen et al. Jan. 28, 1991.
"Traffic Modeling and Frequency Resource Management for Mobile Satellite Networks", by Mizuike et al., pp. 147-164, 7-9 Nove 95.
"Frequency Sharing Between Leo System", by M. Cohen et al., published in Alcatel-Espace, Apr. 18, 1993.

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