Spacecraft TDMA communications system with synchronization by sp

Details Spacecraft TDMA communications system with synchronization by sp Spacecraft TDMA communications system with synchronization by sp

Filed on

1996-05-29

Date issued

1999-03-02

Examiner

Hsu, Alpus H.

Patent Class

Multiplex communications

SubClass

Communication over free space

SubSubClass

Repeater

Other Related Categories

370324, 370350, 370515, 342357, 375365, 455 132, 455 676, 455430, 455431, H04B 7212, H04J 306

Type

Patent

Status

active

Patent number

058780343

Description

ABSTRACT:
In a time division multiple access spacecraft communication system, each ground station determines when to send its information packets to arrive at the spacecraft at the beginning of a time slot. The calculation is based upon knowledge of the locations of the spacecraft and the transmitting ground station. A master ground station determines the location of the spacecraft by the use of the propagation delays between the various ground stations (including itself) and the spacecraft, together with knowledge of the locations of the ground stations. The spacecraft location is then transmitted back to the various ground stations. The determination of propagation delay by each ground station is performed by repeatedly transmitting a ranging signal containing a multiple-bit unique word to the spacecraft, and counting spreading code chips until the next unique word is received from the spacecraft.

REFERENCES:
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patent: 4292683 (1981-09-01), Jueneman
patent: 4574379 (1986-03-01), Eng et al.
patent: 4617674 (1986-10-01), Mangulis et al.
patent: 4745599 (1988-05-01), Raychaudhuri
patent: 4800560 (1989-01-01), Aoki et al.
patent: 5017926 (1991-05-01), Ames et al.
patent: 5041833 (1991-08-01), Weinberg
patent: 5126748 (1992-06-01), Ames et al.
patent: 5619211 (1997-04-01), Horkin et al.
patent: 5680143 (1997-10-01), Hershey et al.

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