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31. 发明专利

DK116375B 未知
公开(公告)号：DK116375B
公开(公告)日：1970-01-05
申请号：DK500164
申请日：1964-10-09
申请人： ARENDT P , HUTCHINSON H
发明人： HUTCHINSON H , ARENDT P
IPC分类号： H04B7/20

32. 发明专利

CH431639A Vorrichtung zur Verstärkung eines Trägerfrequenz-Eingangssignals und Verschiebung der Trägerfrequenz 未知
公开(公告)号：CH431639A
公开(公告)日：1967-03-15
申请号：CH1620064
申请日：1964-12-15
申请人： NASA
发明人： WALTER KENDALL ALLEN
IPC分类号： H01J25/38 , H04B7/185 , H03F3/58 , H04B7/20

33. 发明专利

IL111340A Frequency hopping multiple access communication system 未知
公开(公告)号：IL111340A
公开(公告)日：1998-08-16
申请号：IL11134094
申请日：1994-10-19
申请人： POWERSPECTRUM TECHNOLOGY LTD
IPC分类号： H04B20060101 , H04B1/713 , H04B7/26 , H04W84/00 , H04Q7/20 , H04B7/20

34. 发明专利

GB2256776B Maintenance terminal unit loopback facility 未知
公开(公告)号：GB2256776B
公开(公告)日：1995-08-23
申请号：GB9110258
申请日：1991-05-11
申请人： MOTOROLA LTD
发明人： DUMBRILL MICHAEL , BENDLE IAN , YEONG MOI , GEORGE RICHARD
IPC分类号： H04B17/00 , H04W24/00 , H04B7/20 , H04B7/26

35. 发明专利

IN165055B A RADIO COMMUNICATION SYSTEM 未知
公开(公告)号：IN165055B
公开(公告)日：1989-08-12
申请号：IN625CA1985
申请日：1985-08-30
申请人： GEOSTAR CORP
发明人： O'NEILL GERARD KITCHEN , SNIVELY LESLIE ORIN
IPC分类号： G01S5/14 , G01S13/87 , G01S19/38 , G01S19/48 , H04B7/15 , H04B7/185 , H04B17/40 , H04B7/00 , H04B7/20
摘要： A radio position determination and message transfer system is implemented using a number of satellites in geostationary orbit for relaying interrogation and reply signals between a ground station and a user-carried transceiver. Message information can be exchanged between a given user transceiver and the ground station, as well as between different user transceivers. The user transceiver is provided with means for monitoring the quality of the radio communication link between the transceiver and one or more of the satelites, based on errors detected in the received interrogation signals. The transmission of a reply signal by the transceiver is enabled only when the link quality is found to be acceptable. The reply signal may contain message information or may constitute a request for a position fix. In the latter case, the transceiver may be configured to await favorable link quality to more than one satellite before the reply signal is transmitted.

36. 发明专利

AR204189A1 未知
公开(公告)号：AR204189A1
公开(公告)日：1975-11-28
申请号：AR25728975
申请日：1975-01-01
申请人： SIEMENS AG
IPC分类号： H04B7/212 , H04J3/02 , H04B7/20
摘要： 1488572 Satellite TDMA communication system SIEMENS AG 3 Jan 1975 [14 Jan 1974] 226/75 Heading H4M In a satellite communication system wherein transmitted bursts comprising TDM signal channels together with a preamble from different ground stations are combined in time staggered fashion to form a TDM block at a satellite and are retransmitted therefrom, the time required for phase correction of a burst before it is initially transmitted from a ground station is considerably reduced relative to that required in the prior art. For a particular ground station BSt2 to effect initial access it transmits an initial access signal (operation (a) (Fig. 3)) at a substantially lower level than effective signals to the satellite Sa, receives this initial access signal when retransmitted from the satellite and monitors the position of the signal as it appears in the TDM block (b). As a result of this the transmission phase at the ground station is adjusted to an intermediate phase, displaced from the desired proper phase at which burst transmission should occur by about half the possible tolerance in measuring the phase deviation between the initial access signal and the desired phase (c). The burst preamble adjusted to this intermediate phase is then transmitted (d) and is fine adjusted to the intermediate phase by a burst transmission phase control system making use of the ground stationsatellite loop (e). The burst preamble is next incrementally phase shifted by a programmed control arrangement not using the station-satellite loop to the desired phase (f). Thereafter the complete burst is transmitted (g) and held at the desired phase by the station-satellite phase control system.

37. 发明专利

CA970487A REFERENCE STATION AUTOMATIC REPLACEMENT SYSTEM FOR A TRANSMISSION SYSTEM THROUGH SATELLITE 未知
公开(公告)号：CA970487A
公开(公告)日：1975-07-01
申请号：CA121465
申请日：1971-08-26
申请人： SITS SOC IT TELECOM SIEMENS
发明人： BERNASCONI GABRIELE , PORETTI ISIDORO
IPC分类号： H04B7/212 , H04B7/20
摘要： A time-division-multiplex telecommunication system, with a multiplicity of ground stations communicating with one another via satellite, allocates to each ground station one or more subframes in a series of such subframes following one another in cyclic succession to constitute a sequence of signal frames. The first subframe of each frame, designated the reference subframe, serves for the transmission of frame-synchronizing signals from one of the stations of the system operating as a reference station, the latter sending out its address together with the frame-synchronizing code. In every other station, a counter triggered by an incoming frame-synchronizing code determines from that address the subframe allocated to the reference station and, in the one station using the next-following active subframe, generates an internal signal designating that station as a standby station to serve as a reference station if the actual reference station drops out. The standby condition is terminated upon reception of the next frame-synchronizing code but, in the absence of a predetermined number of such codes in successive frames, is converted into a reference condition whereby the affected station takes over the transmission of frame-synchronizing pulses.

38. 发明专利

GB1377818A RELAY STATIONS FOR USE IN A TELECOMMUNICATION TRANSMISSION SYSTEM 未知
公开(公告)号：GB1377818A
公开(公告)日：1974-12-18
申请号：GB2947672
申请日：1972-06-23
申请人： SIEMENS AG
IPC分类号： H04B7/15 , H04B7/185 , H04J1/06 , H04J1/10 , H04B7/20
摘要： 1377818 Relay systems SIEMENS AG 23 June 1972 [4 Aug 1971] 29476/72 Heading H4L In a satellite relay station where the I.F. band derived from the received R.F. signal 1 is split into separate adjacent sub-bands a to m, Fig. 1, for separate amplification 14, each amplified I.F. signal is separately combined 15 with a respective output t1s to t12s of a common carrier oscillator 30, 34, 35, and fed to a respective amplifier 16, the outputs of all of which are combined 23 and transmitted 25, 29. The I.F. and mixer channel 14, 15, 16 is duplicated 22 for reliability, and each I.F. sub-band channel 18, 19, 20, 21, 22 incorporates this redundancy. Channels a-f are odd channels, and g-m are even channels, and feed respective outputs 23, 25 and 27, 29. The duplicate mixers (15) also receive the same carrier frequency t1s 1 to t12s 1 , all these carriers t1s to t12s 1 being derived from a single oscillator 30 by means of frequency dividers 31 ( x 12) and 35 ( x 16), travelling wave amplifiers 39, 41, 49, 50, and hybrid junctions 40 42, 51, 52; redundancy 36, 45, 46 is again provided. The oscillator 30 also provides the receiver superhet carrier frequency t1e (t1e 1 , t2e, t2e 1 ) by means of divider 33 and couplers 37, 38, 47, 48. Receiver redundancy 7, 11 is also included. The transmitter carrier amplifiers 39, 41, 49, 50 may also be used to amplify the receiver carrier output of the oscillator (Fig. 2, not shown), filters (55, 56, 58, 59) being used to combine and separate the two carriers before and after the amplifier (57). Circuits (Figs. 3, 4, not shown), are disclosed for providing a beacon signal for satellite tracking at the transmitted carrier frequency and they include means for phase modulating the beacon signal with telemetry information (at 74, 76).

39. 发明专利

NL7408086A 未知
公开(公告)号：NL7408086A
公开(公告)日：1974-12-17
申请号：NL7408086
申请日：1974-06-17
IPC分类号： H04B1/54 , H03G3/20 , H04B7/20

40. 发明专利

SE370833B 未知
公开(公告)号：SE370833B
公开(公告)日：1974-10-28
申请号：SE1622071
申请日：1971-12-17
申请人： SITS SOC IT TELECOM SIEMENS
发明人： BERNASCONI , PORETTI
IPC分类号： H04B7/212 , H04B7/20
摘要： A time-division-multiplex telecommunication system, with a multiplicity of ground stations communicating with one another via satellite, allocates to each ground station one or more subframes in a series of such subframes following one another in cyclic succession to constitute a sequence of signal frames. The first subframe of each frame, designated the reference subframe, serves for the transmission of frame-synchronizing signals from one of the stations of the system operating as a reference station, the latter sending out its address together with the frame-synchronizing code. In every other station, a counter triggered by an incoming frame-synchronizing code determines from that address the subframe allocated to the reference station and, in the one station using the next-following active subframe, generates an internal signal designating that station as a standby station to serve as a reference station if the actual reference station drops out. The standby condition is terminated upon reception of the next frame-synchronizing code but, in the absence of a predetermined number of such codes in successive frames, is converted into a reference condition whereby the affected station takes over the transmission of frame-synchronizing pulses.

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