US3787634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for controlling the transmit time of stations which are in communication with one another via a satellite
Assignee: International Standard Electric Corp
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Filing: 1972-10-13
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Granted: 1974-01-22
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Expires: 1992-10-13
Abstract
Abstract This relates to timing control of message bursts in a TDMA communication satellite system. Each ground station stores information as to both its time slot of transmission and duration of transmission as determined by a master station. The timing control is derived by comparing the received timing information with the stored timing information. When a difference is detected, the transmit timing is altered as required to carry on communication and maintain complete frame fill even when certain stations of the system are not involved in communication.
Inventors
- 👤 H Haberle
- 👤 E Herter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:37
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/212; H04B7/2125; H04B7/2126
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
A system within each of a master station and a plurality of other stations in communication with each other via a satellite for controlling the transmission time of a message burst in a given time slot of a total frame time allocated to all of said stations comprising: first means to store information indicating the time slot for transmission from the associated one of said stations as determined by and received from said master station; second means to receive signals indicating the beginning of said total frame time; third means coupled to said second means responsive to said received signals indicating the beginning of said total frame time to determine information indicating said given time slot presently employed by the associated one of said stations; and fourth means coupled to said first and third means to compare, at the start of transmitting a new message burst, said stored information and said determined information to produce a timing control signal to control said transmission time of the next message burst when a difference between said stored and determined information is detected.
Claim 2
Independent Claim
180 words
A system within each of a master station and a plurality of other stations in communication with each other via a satellite for controlling the transmission time of a message burst in a given time slot of a total frame time allocated to all of said stations comprising: first means to store information indicating the time slot for transmission from the associated one of said stations as determined by and received from said master station; second means to receive signals indicating the beginning of said total frame time; third means coupled to said second means responsive to said received signals indicating the beginning of said total frame time to determine information indicating said given time slot presently employed by the associated one of said stations; and fourth means coupled to said first and third means to compare, at the start of transmitting a new message burst, said stored information and said determined information to produce a timing control signal to control said transmission time of the next message burst when a difference between said stored and determined information is detected.
Claim 3
Dependent Claim
25 words
A system according to claim 1, wherein said first means further includes a section therein to store said difference between said stored and determined information.
Claim 4
Dependent Claim
49 words
A system according to claim 2, further including fifth means coupled to said fourth means to prevent utilization of said timing control signal for a time equal to twice the travel time to said satellite when said difference between said stored and determined information is present during subsequent comparisons.
Claim 5
Dependent Claim
52 words
A system according to claim 3, further including sixth means to provide a fault indication coupled to said fourth means and said section, said sixth means being rendered inoperative when said difference between said stored and determined information of a subsequent comparison equals said stored difference between said stored and determined information.
Claim 6
Dependent Claim
52 words
A system according to claim 2, further including fifth means to provide a fault indication coupled to said fourth means and said section, said fifth means being rendered inoperative when said difference between said stored and determined information of a subsequent comparison equals said stored difference between said stored and determined information.
Claim 7
Dependent Claim
25 words
A system according to claim 1, wherein said determined information and said timing control signal are multiples of a channel clock signal of said system.
Claim 8
Dependent Claim
43 words
A system according to claim 1, wherein each of said other stations are in communication with said master station by means of a service channel, and said first means receives said information relating to said time slot for transmission on said service channel.
Claim 9
Dependent Claim
86 words
A system according to claim 1, wherein said signals of said total frame time includes a master station address and an address for each of said other stations; and said third means includes a clock responsive to said master station address to produce a receiver clocK signal, and a counter coupled to said clock to count said receiver clock signal, said counter being responsive to said address of the associated one of said other stations to read the count of said counter into said fourth means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |