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81. 发明授权

US3942115A Dual pilot redundant AFC system for satellite communications system 失效
标题翻译：用于卫星通信系统的双导频冗余AFC系统
公开(公告)号：US3942115A
公开(公告)日：1976-03-02
申请号：US411541
申请日：1973-10-31
申请人： Chester Joseph Wolejsza, Jr.
发明人： Chester Joseph Wolejsza, Jr.
IPC分类号： H04J1/12 , H04B7/15 , H04B7/208 , H04B17/00 , H04J1/16 , H04B7/20
CPC分类号： H04B7/208
摘要： A pilot signal for implementing automatic frequency control in a satellite communications system is continuously transmitted by a designated ground station. Its frequency lies in the middle of the communications band so that it will undergo the same frequency shifts or distortions as the overall communications signal. A second ground station monitors the presence of the pilot signal, and if it is lost for a predetermined time, this second station then transmits the pilot signal to ensure the continuation of the AFC function throughout the system. If the pilot signal is lost at the second station, however, an uncertainty might exist as to whether the failure is in the designated ground station or the second ground station. To resolve this uncertainty a secondary pilot signal, having a frequency different from but in the same band as the primary pilot signal, is transmitted by a third ground station. If the second station then looses the primary pilot signal while still receiving the secondary pilot signal, it knows that the failure is in the designated ground station and therefore begins to transmit the pilot signal. A fourth ground station may monitor both the primary and secondary pilot signals, and transmit the secondary pilot signal if the latter is lost while the primary pilot signal is still being received, thus providing a back-up capability for the secondary pilot signal.
摘要翻译：用于在卫星通信系统中实现自动频率控制的导频信号由指定的地面站连续发送。其频率位于通信频带的中间，使其将经历与总体通信信号相同的频移或失真。第二地面站监视导频信号的存在，并且如果它在预定时间内丢失，则该第二站然后发送导频信号，以确保在整个系统中延续AFC功能。然而，如果导频信号在第二站丢失，则可能存在故障是否在指定的地面站或第二地面站中的不确定性。为了解决该不确定性，具有与主导频信号不同但在相同频带中的频率的次导频信号由第三地面站发送。如果第二站然后在仍然接收到次导频信号的同时失去主导频信号，则它知道故障在指定的地面站中，因此开始发送导频信号。第四地面站可以监视主导频信号和次导频信号，并且如果后导频信号在主导频信号仍然被接收时丢失，则发送次导频信号，从而为辅导频信号提供备用能力。

82. 发明授权

US3836969A Geo-synchronous satellites in quasi-equatorial orbits 失效
标题翻译：地质同步卫星在均匀轨道中
公开(公告)号：US3836969A
公开(公告)日：1974-09-17
申请号：US19208371
申请日：1971-10-26
申请人： RCA CORP
发明人： BOND D , HOLMAN J
IPC分类号： H04B7/15 , B64G1/10 , B64G1/24 , H04B7/19 , H04B7/20
CPC分类号： H04B7/19 , B64G1/1007 , B64G1/1085 , B64G1/242
摘要： The method of the selection of launch conditions for a satellite at substantially synchronous altitude above the earth in a slightly inclined orbit relative to the equatorial plane of the earth to limit the inclination that may be induced by perturbations for significantly long periods of time without the need of orbit adjusting means (north-south station keeping means) aboard the satellite. One or more such satellites are arranged in a communication system in cooperation with at least one ground station. In a two-satellite system a communication channel is continuously operated between at least one satellite and the ground station notwithstanding solar outages.

D R A W I N G
摘要翻译： {PG，1

83. 发明授权

US3683279A Phase locked loop 失效
标题翻译：相位锁定环
公开(公告)号：US3683279A
公开(公告)日：1972-08-08
申请号：US3683279D
申请日：1969-12-17
申请人： ITT
发明人： WEINBERG MURRAY , KRAUSE IRVING A
IPC分类号： H03L7/06 , H04B1/59 , H04B7/20
CPC分类号： H03L7/06
摘要： An oscillator in a spacecraft transponder or repeater is frequency stabilized by a phase locked loop with reference signal therefor having a frequency (N/M) F being received in the repeater from a ground station. The reference signal is processed in the repeater and returned to the ground station where it is monitored to detect when the pull-in range of the loop is exceeded. When this condition is detected, the frequency of the reference signal is swept in the ground station until the frequency of the reference signal and frequency of the signal of the oscillator in the repeater is within said pull-in range. The oscillator frequency F is divided by M and the phase comparator includes a first tuned input circuit to respond to a frequency (N/M) F, a second turned input circuit to respond to the nth harmonic of the frequency F/M and a phase error detecting circuit to produce a control signal used to stabilize the frequency of the oscillator.
摘要翻译：航天器应答器或中继器中的振荡器由锁相环频率稳定，其参考信号具有从地面站在中继器中接收的频率（N / M）F。参考信号在中继器中处理，并返回到地面站，在那里进行监控，以检测何时超过环路的拉入范围。当检测到该条件时，参考信号的频率在地面站中扫描，直到参考信号的频率和中继器中的振荡器的信号的频率在所述拉入范围内。振荡器频率F除以M，相位比较器包括第一调谐输入电路，以响应频率（N / M）F，第二转换输入电路以响应频率F / M的第n次谐波，相位误差检测电路产生用于稳定振荡器频率的控制信号。

84. 发明授权

US3639838A Synchronized variable delay time division communication system 失效
标题翻译：同步可变延迟时间段通信系统
公开(公告)号：US3639838A
公开(公告)日：1972-02-01
申请号：US3639838D
申请日：1968-01-30
申请人： HUGHES AIRCRAFT CO , ROSS CORLESS WINTERBOTTOM
发明人： KUHN HENRY G
IPC分类号： H04B7/212 , H04B7/20
CPC分类号： H04B7/2126
摘要： A locally-generated reference sync signal and the master sync signal received from the repeater are compared in time of occurrence to develop an error signal which varies the frequency of a controllable oscillator to synchronize the reference sync signal to the master sync signal. A counter and timing matrix in the master sync loop controls the generation of own-sync reference signals during the station''s time slot. The own-sync reference signals are compared in time of occurrence with the own-sync signals as received via the repeater to develop an error signal which varies the phase of a continuously variable phase shifter to synchronize the own-sync generator to the own-sync reference signals. In another embodiment, the range to the repeater obtained by means of a ranging signal is compared with the time difference between the output of the counter and timing matrix in the master sync loop, and the output of the transmit counter and timing matrix. The resultant error signal varies the phase of the continuously variable phase shifter to correct the timing of the transmit control circuits.
摘要翻译：在发生时间内比较本地生成的参考同步信号和从中继器接收的主同步信号，以产生改变可控振荡器的频率以使参考同步信号与主同步信号同步的误差信号。主同步环路中的计数器和定时矩阵控制在站时隙期间产生自身同步参考信号。自身同步参考信号在发生时与通过中继器接收的自身同步信号进行比较，以产生一个误差信号，该误差信号改变连续可变移相器的相位，以将自身同步发生器同步到自身同步信号参考信号。在另一个实施例中，将通过测距信号获得的中继器的范围与主同步环中的计数器和定时矩阵的输出之间的时间差以及发送计数器和定时矩阵的输出进行比较。所得到的误差信号改变连续可变移相器的相位，以校正发射控制电路的定时。

85. 发明授权

US3626298A Transition tracking bit synchronization system 失效
标题翻译： TRANSITION跟踪位同步系统
公开(公告)号：US3626298A
公开(公告)日：1971-12-07
申请号：US3626298D
申请日：1969-07-08
申请人： NASA
发明人： ANDERSON TAGE O , HURD WILLIAM J , LINDSEY WILLIAM C
IPC分类号： H04L7/033 , H04B7/18 , H04B7/20 , H04L7/02
CPC分类号： H04L7/0332
摘要： A bit synchronization system, incorporating a digital data transition tracking phase-locked loop. The system, to which an input signal in the form of a noise-distorted constant amplitude bipolar stream of data bits, is assumed to be supplied, includes two integration channels. In one channel integrations are performed over assumed bit times, each bit time being equal to a bit period, while in the other channel integrations are performed over integration windows, each window being less than a bit period. The outputs of the two channels are combined to provide a pair of binary signals which are supplied to a digital filter, comprising a variable length counter and a variable gain register. The contents of two registers are combined to provide an error signal indicative of the direction of the phase difference between periods of bits in said stream and the assumed bit times.

86. 发明授权

US3626295A Time division multiplex communication system 失效
公开(公告)号：US3626295A
公开(公告)日：1971-12-07
申请号：US3626295D
申请日：1969-12-09
申请人： NIPPON ELECTRIC CO
发明人： SABRUI AKIO
IPC分类号： H04J3/00 , H04B7/15 , H04B7/212 , H04B7/20
CPC分类号： H04B7/2126
摘要： A time division multiple access communication system including earth stations and a satellite station wherein each earth station includes a paired transmitter and receiver for acquisition and burst synchronization; the transmitter sending first pattern signals, each identifying the start of one signaling frame including a plurality of frequency slots divided on a time basis to identify each earth station, to the satellite for reception and retransmission to the earth stations; the receiver deriving a reference time point from each received first pattern signal, for generating second pattern signals; detecting a time difference between time periods of the first and second pattern signals including a polarity indication of such difference; algebraically adding signals representing such time difference and polarity, a preassigned time interval during which the signal burst is to be transmitted, and the one signal frame and time position therein at which the signal burst is to be transmitted.

87. 发明授权

US3579240A Selective radio receiver system 失效
标题翻译：选择性无线接收机系统
公开(公告)号：US3579240A
公开(公告)日：1971-05-18
申请号：US3579240D
申请日：1968-04-30
申请人： ALLIANCE MFG CO
发明人： DEMING ANDREW F
IPC分类号： G08C19/12 , H04B1/00 , H04B1/06 , H04B7/20
CPC分类号： G08C19/12
摘要： The disclosure shows a remotely controlled radio receiver circuit which may be used to control a garage door operator, for example, from a low-power remote transmitter. The signal emitted by the transmitter includes a carrier as modulated by a lower frequency, for example an audiofrequency, which signal is amplified in the receiver, detected and supplied to an audiofrequency resonant load and to a resistance load. These two loads are connected in opposition so that if the received signal is of the proper carrier frequency to be amplified and passed through the first stages of the receiver and if the audiofrequency is of the proper preselected frequency to be resonated by the audiofrequency resonant circuit, a resonant voltage signal is passed. A first time delay capacitor is connected in a circuit to give only time delay of turn turn-on of a load relay, and a second time delay capacitor is connected in circuit to give only time delay of dropout of the relay, and in this manner telemetering or other relatively rapid pulsed signals, even of the proper carrier and audiofrequencies, do not actuate the relay. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

88. 发明授权

US3564416A Cordless,self-contained microphone transmitter 失效
标题翻译：无绳，自包含麦克风发射器
公开(公告)号：US3564416A
公开(公告)日：1971-02-16
申请号：US3564416D
申请日：1968-03-29
申请人： EDWARD G PRICE
发明人： PRICE EDWARD G
IPC分类号： H04B5/06 , H04B7/20
CPC分类号： H04B5/06
摘要： A CORDLESS, SELF-CONTAINED, FREQUENCY MODULATED MICROPHONE TRANSMITTER INCLUDING A HOUSING ADAPTED TO BE HAND-HELD, A MICROPHONE PICKUP ELEMENT, AND A CIRCUIT COMPRISING A BATTERY, AN INPUT IMPEDANCE MATCHING AND EQUALIZATION NETWORK, A TRIPLEX COLPITTS RADIO FREQUENCY OSCILLATOR-MODULATOR, AN ANTENNA THAT INCLUDES COMPONENTS OF THE MICROPHONE PICKUP ELEMENT, AND AN ISOLATING BUFFER AMPLIFIER TO COUPLE FREQUENCY MODULATED ENERGY TO THE ANTENNA.

89. 发明授权

US3534266A System for automatic transmission and reception of repetitive programs 失效
标题翻译：自动传输和接收重复方案的系统
公开(公告)号：US3534266A
公开(公告)日：1970-10-13
申请号：US3534266D
申请日：1967-09-28
申请人： NEWSRAD INC
发明人： HALSTEAD WILLIAM S
IPC分类号： G08G1/09 , H04B5/00 , H04B14/00 , H04H20/34 , H04H60/13 , H04B1/70 , H04B7/20
CPC分类号： H04H20/16 , G08G1/094 , H04B14/002 , H04H20/34 , H04H60/13

90. 发明授权

US3517312A Telephone and telegraph switching system utilizing a stationary satellite 失效
标题翻译：电话和电视切换系统使用静态卫星
公开(公告)号：US3517312A
公开(公告)日：1970-06-23
申请号：US3517312D
申请日：1967-02-23
申请人： NIPPON ELECTRIC CO
发明人： YAMATO SHIGEKI , WATANABE TATSUKI , SHIMASAKI NOBUHIKO , TASHIRO SHUNJI
IPC分类号： H04B7/185 , H04Q11/04 , H04B7/20
CPC分类号： H04Q11/04 , H04B7/18528

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