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| Number | Title | Issue Date |
| 4630267 | Programmable timing and synchronization circuit for a TDMA communications controller The disclosed circuit employs a single programmable timer and address decoder which identifies a plurality of bursts received from other stations in a TDMA communications network by means by identifying their origin addresses, and then starts associated t... | 12/16/1986 |
| 4617674 | Synchronizing system for spread spectrum transmissions between small earth stations by satellite via an intermediate hop to a large earth station A communication system comprising a satellite, a master earth station (MES), and a plurality of small earth stations (SESs) provides signal transmissions addressed and transmittable to a selectable other SES via the satellite, the MES, and then the satell... | 10/14/1986 |
| 4602375 | Onboard clock correction by means of drift prediction In an on-board satellite clock correction system of the type wherein phase errors between the satellite clock and a ground-based clock are determined and a clock correction value sent to the satellite, the clock correction value is determined by curve-fit... | 07/22/1986 |
| 4592050 | Apparatus and method for providing a transparent interface across a satellite communications link A mechanism is disclosed for a time division multiple access communications network, to enable the synchronizing of traffic messages between a transmitting and a receiving node. A transmit clock mechanism at the transmitting node includes a slip counter f... | 05/27/1986 |
| 4577316 | Synchronization system for a regenerative subtransponder satellite communication system A satellite communications system has a number of earth stations sharing an uplink carrier in a time division multiple access mode. One of the earth stations is designated as the master station for the carrier. The uplink transmissions from each station a... | 03/18/1986 |
| 4574377 | Synchronization method and apparatus in redundant time-division-multiple-access communication equipment A synchronization method and apparatus in redundant time-division-multiple-access communication equipment, wherein the synchronization between an active circuit and a standby circuit is carried out using a frequency divided signal from the active transmis... | 03/04/1986 |
| 4574379 | Synchronization technique for non-colocated TV signals in a TDMA satellite communication system The present invention relates to a technique for the synchronization of multiplexed television signals within each burst signals received at a remote station or satellite in a TDMA communication system from non-colocated ground stations. The technique emp... | 03/04/1986 |
| 4561099 | Clock recovery system for TDMA satellite communication system A clock signal in a TDMA burst signal is recovered by using the frequency and phase information extracted by taking a moving average of plural bursts received previously from the same earth station. The system has memory storage for storing frequency and/... | 12/24/1985 |
| 4555782 | Base-band equipment for ground stations of satellite telecommunication system An SS/TDMA communication system comprises a multiplicity of ground stations, including one master station and a number of traffic stations without control function, exchanging digitized voice or other message signals via a relay station aboard a satellite... | 11/26/1985 |
| 4513416 | System for adjusting a time axis by using a control and an adjustment time slot in a satellite station of a TDMA network In a TDMA network wherein a central station sends signals towards satellite stations in downward frames (A), each comprising a control time slot (Td0) and speech time slots (Td1 to TdM), and receives signals from one to M satellite stations in upward fram... | 04/23/1985 |
| 4507779 | Medium speed multiples data Synchronization can be acquired between a transmitting node and a receiving node on a time division multiple access communication link without the necessity for additional data bits in the data stream, by correlating the number of errors detected in any i... | 03/26/1985 |
| 4488296 | Time division multiple access system for transmitting an analog signal by the use of bursts without substantial interruption In a time division multiple access system comprising a central station and a plurality of substations, a subsidiary analog signal is sampled at a sampling circuit of each substation M times during each frame period to produce a succession of sampled pulse... | 12/11/1984 |
| 4485383 | Global position system (GPS) multiplexed receiver A global position system (GPS) capable of multiple (two or more space vehicles) space vehicle (SV) multiplexing comprises an RF energy receiver for receiving high and low frequencies (L1 and L2) from a plurality of SVs on different c... | 11/27/1984 |
| 4470141 | Multi-direction time division multiplex communication system The inventive system includes a central station and a plurality of satellite stations which communicate on a time division multiplex basis. The central station generates frame synchronizing and clock signals, along with digital communication signals, whic... | 09/04/1984 |
| 4418409 | Byte data activity compression In a TDMA satellite communications system, the data ports at two different earth stations have their data rates synchronized. The origination port stores the last eight-bit byte of data in each 480-bit packet which is transmitted via the satellite. The la... | 11/29/1983 |
| 4397019 | TDMA Intertransponder communication Groups of stations operate in TDMA mode relative to associated frequency-separated transponder segments of a satellite repeater. Stations at radio signaling modes in all groups key to a common frame timing reference. The TDMA frame is partitioned repetiti... | 08/02/1983 |
| 4397018 | Baton passing method and apparatus for maintaining synchronization in a TDMA satellite communication system In a TDMA satellite communication system, one of the stations is elected the primary station which transmits a reference burst to all other stations to synchronize the local clocks in each station. Each subsidiary station in turn responds by transmitting ... | 08/02/1983 |
| 4355388 | Microprogrammable TDMA terminal controller A microprogrammable TDMA terminal controller is of modular construction. Frame reference and burst synchronization timing are resolved to the symbol level by a split frame counter, and a control RAM is reprogrammable "on-the-fly" to permit easy changes in... | 10/19/1982 |
| 4346470 | Initial acquisition of synchronization for a station in a TDMA satellite communication network A method and apparatus are disclosed for acquiring transmit synchronization at a secondary station with the periodic frame reference bursts from a reference station in a TDMA network in an improved manner to enable the use of full power initial acquisitio... | 08/24/1982 |
| 4320504 | Mechanism for synchronization of data ports in TDMA communication The transmission and reception pattern generators are synchronized for all data ports operating at the same data rate throughout an entire TDMA system. This eliminates the necessity for bit stuffing to accommodate non-integral multiple data rate data port... | 03/16/1982 |
| 4320503 | Synchronizing transmissions from two earth stations to satellite A method of synchronizing the transmissions of alternate video fields or frames from two earth stations over a common uplink channel to a satellite so that the fields or frames arrive in interleaved time periods. A synchronizing pulse is transmitted over ... | 03/16/1982 |
| 4309764 | Technique for increasing the rain margin of a satellite communication system The present invention relates to a technique for increasing the rain margin at ground stations of a satellite communication system. In the present technique, spare TDMA time slots in each frame sequence are shared among all ground stations as required by ... | 01/05/1982 |
| 4292683 | Guard band reduction in open loop TDMA communications An open loop TDMA communications system includes a transponder located on a spacecraft in quasi-synchronous earth orbit; a reference station periodically transmits a timing marker through said transponder to a plurality of geographically separated earth s... | 09/29/1981 |
| 4262356 | Method and system for synchronizing a TDMA communication network comprising a satellite equipped with several directional beam antennas transmitting signals at various frequencies A method and a system are disclosed for synchronizing within a recurrent time frame the starting points of the transmissions from the various stations in a TDMA network wherein N stations distributed among M separate zones covered by M different down-link... | 04/14/1981 |
| 4218654 | Space diversity system in TDMA communication system A space diversity system in a TDMA communication system employing a communication satellite, in which in order to equalize the path lengths of respective sending paths at the start of communication, a pre-burst is sent out to one of the paths making up th... | 08/19/1980 |
| 4215348 | Method of and system for synchronizing data reception and retransmission aboard communication satellite A receiver aboard a communication satellite, designed to detect digital signals arriving in intermittent bursts from a ground station with a bit cadence differing but slightly from a clock frequency fs generated by a time base on the satellite,... | 07/29/1980 |
| 4168398 | Initial acquisition signal detection system for TDMA satellite communication A low level initial acquisition signal consisting of a continuous wave signal portion followed by a phase-modulated signal portion is transmitted via a satellite to a receiving station. The received CW signal is converted by a voltage-controlled variable ... | 09/18/1979 |
| 4145573 | Digital satellite system and method for serving users of differing capacities In a multibeam digital time-division switched satellite communications system users of differing capacity needs are efficiently served by quantizing the capacity of each ground station and similarly the bit repetition rate of each ground station into inte... | 03/20/1979 |
| 4135059 | Multiple channel per burst TDMA multiple transponder network A time division multiple access (TDMA) communication system has a plurality of geographically separated stations including a first group of stations, each of which can communicate with any other station in the first group through a first transponder in a ... | 01/16/1979 |
| 4117267 | System for two-way communication between a master station and a plurality of substations via a satellite A system for communication between aircraft and a ground control center via a satellite. Information is transmitted in bursts from all the aircraft to the ground control center on a time division multiple access basis in a first radio frequency channel co... | 09/26/1978 |
| 4112498 | Digital correlation receiver A digital correlation receiver, particularly for satellite communications transmission, wherein the signal channels or bursts, from various ground stations, combined in a time division multiplex (t.d.m.) arrangement and provided with a preamble comprising... | 09/05/1978 |
| 4107608 | Method and apparatus for burst synchronization in a time division multiple access communication system A burst synchronization technique employed in a multiple access TDMA communication system in which all member stations communicate through a common repeater apparatus such as a stationary satellite. A member station may gain access by transmitting during its a... | 08/15/1978 |
| 4100499 | Carrier synchronization system for coherent phase demodulators This invention concerns a carrier synchronization system for a four-phase coherent PSK demodulator. The four-phase PSK signal is demodulated by an in-phase reference carrier and a quadrature reference carrier both of which are locally generated by a refer... | 07/11/1978 |
| 4068104 | Interface for in band SCPC supervisory and signalling system An in band single channel per carrier supervisory and signalling apparatus and method is disclosed for satellite communications. The apparatus includes a near supervisory interface located at a transmitting terminal, and a far supervisory interface locate... | 01/10/1978 |
| 4054753 | Double sync burst TDMA system A TDMA system in which each station times its respective data burst from a reference sync burst transmitted by a designated primary reference station over the satellite link. Another station transmits a secondary sync burst timed from the primary stations... | 10/18/1977 |
| 4052670 | Space diversity system in PCM-TDMA telecommunication system using stationary communication satellite A space diversity PCM-TDMA telecommunication system using a stationary communication satellite, in which fixed delay circuits are respectively inserted in the sending side and the receiving side of one route at a control equipment, while variable delay ci... | 10/04/1977 |
| 4017684 | System for determining burst sending timing in TDMA communication A system for determining burst sending timing in a time division multiple access communication system using a communication satellite, in which burst signals transmitted from a plurality of stations are arranged on the communication satellite in one frame... | 04/12/1977 |
| 4010420 | Satellite communications transmission apparatus and method A satellite communication system wherein transmissions from a plurality of ground stations are transmitted via a satellite in a time-multiplex manner and where each station is assigned a particular time slot wherein for synchronizing a ground station into... | 03/01/1977 |
| 4004225 | Method for synchronizing the pulse frames in time multiplex data transmission via communication satellites A data transmission system for the transmission of time multiplex data between a plurality of stations via the transponder of a communications satellite wherein each pulse frame includes a code sequence (SRUW) periodically transmitted by a reference stati... | 01/18/1977 |
| 4004098 | Satellite on-board switching system with satellite-to-satellite link A Space Division Multiple Access (SDMA) Communications satellite system which utilizes a pair of communications satellite relays having a communications link between them. Each satellite includes a plurality of receive spotbeam antennas which are selectiv... | 01/18/1977 |
