Multiple access communication system

Details Multiple access communication system Multiple access communication system

1989-01-18

1992-06-02

Kuntz, Curtis

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359164, 244158R, 342354, 455 121, H04B 1000, B64G 100

Patent

active

051192250

ABSTRACT:
A multiple access communications system comprises a node spacecraft GEO and several user spacecraft LEO.sub.1 to LEO.sub.n. Each user spacecraft LEO.sub.1 to LEO.sub.n includes a transmit/receive terminal head 18.sub.1 to 18.sub.n, and the node spacecraft GEO includes n transmit/terminals 22 to 22.sub.n and a single beacon unit 24. The beacon beam may be operated to initiate acquisition phases which allow two-way communication to be established between the transmit/receive terminals 22.sub.1 to 22.sub.n on the node spacecraft and the transmit/receive terminals 18.sub.1 to 18.sub.n on the corresponding user terminals. The acquisition phases include a period during which the beacon scans an uncertainty cone associated with the node spacecraft. This scanning period is reduced for second and subseqeunt acquisitions by using the first and subsequently acquired communication links to provide a more accurate estimate of the angular attitude of the node spacecraft, thus reducing the extent of the uncertainty cone.

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Auer, W., "Pointing, Acquisition and Tracking for Intersatellite Optical Data Links," May, 1984.
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Proceedings SPIE, Optical Systems for Space Applications, The Hague, 30th Mar.-1st Apr. 1987, pp. 239-244, SPIE-The International Society for Optical Engineering, Washington,, US; A. F. Popescu et al.: "Laboratory Model of A Bidirectional Diode Laser Data Link with Acquisition and Tracking Capability".

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