公开(公告)号：US4019184A

公开(公告)日：1977-04-19

申请号：US550481

申请日：1975-02-18

申请人： Jacques A. Dorey

发明人： Jacques A. Dorey

IPC分类号： G01S13/74 ,  G01S1/02 ,  G01S1/30 ,  G01S1/38 ,  G01S1/40 ,  G01S3/52 ,  G06E3/00 ,  G08G5/00 ,  G08G5/02 ,  H01Q3/04 ,  H01Q3/12 ,  H04L27/227 ,  G01S5/02

CPC分类号： H04L27/2275 ,  G01S1/02 ,  G01S1/38 ,  G01S1/40 ,  G01S3/52 ,  G06E3/001 ,  G08G5/0026 ,  G08G5/0082 ,  G08G5/025 ,  H01Q3/04 ,  H01Q3/12 ,  G08G5/02

摘要： High-frequency waves transmitted by a rotating antenna array at a ground tion are intercepted by an airborne receiver for photoelectric evaluation by one or more discs whose light transmissivity, by translumination or reflection, varies periodically according to a sinusoidal law in one diametral direction while being constant in another diametral direction orthogonal thereto. The disc or discs are rotated at a speed corresponding to that of the transmitting antenna array, under the control of periodic synchronizing pulses, and are illuminated by a flux modulated by an electrical signal derived from the incoming wave, this signal containing a phase component dependent on two spatial coordinates such as elevational and azimuthal angles determining the relative position of the ground transmitter and the airborne receiver. The flux optically filtered by any such disc has a peak at a point determined by the spatial coordinates whereby the relative position can be visualized by a display device such as a vidicon camera and an associated oscilloscope screen. Parasitic components due to reflections from moving objects can be suppressed by integration of the optically filtered flux over a limited period.

摘要翻译： 由地面站上的旋转天线阵列传输的高频波被一个机载接收机所拦截，用于光盘评估的一个或多个光盘，其光透射率通过平面照明或反射根据一个直径方向上的正弦定律周期性地变化，同时 在与其正交的另一直径方向上恒定。 在周期性同步脉冲的控制下，盘或盘以与发射天线阵列相对应的速度旋转，并且被由从入射波导出的电信号调制的磁通照射，该信号包含相位分量依赖 在诸如仰角和方位角之间的两个空间坐标上确定地面发射机和机载接收机的相对位置。 由任何这样的光盘光学过滤的光通量在由空间坐标确定的点处具有峰值，由此相对位置可以由显示设备如视频摄像机和相关联的示波器屏幕来显现。 可以通过在有限的时间段内整合光学滤波的通量来抑制来自移动物体的反射的寄生成分。

公开(公告)号：US3984634A

公开(公告)日：1976-10-05

申请号：US561764

申请日：1975-03-25

申请人： John H. Painter

发明人： John H. Painter

IPC分类号： H04L27/227 ,  H04L15/24 ,  G06F15/36 ,  H04B1/10

CPC分类号： H04L27/2275

摘要： The invention is a detector for radio signals which have been transmitted through a multipath medium. The device operates in conjunction with the radio frequency portion of a receiver to detect digital signals which have been transmitted in known modulation formats. The transmitted signal is constructed by assigning known and distinct modulation waveforms to a sequence of message symbols, or digits. The basic digital message, which the detector is to reconstruct consists of a sequence of digits, each lasting for a fixed time, say T seconds, and each picked from an alphabet of arbitrary, but fixed, size. For example, in a binary message, the alphabet consists of the digits 0 and 1. In a quarternary message, the alphabet consists of the digits 0, 1, 2 and 3.

摘要翻译： 本发明是已经通过多路径介质传输的无线电信号的检测器。 该装置与接收机的射频部分一起工作以检测以已知调制格式发送的数字信号。 通过将已知和不同的调制波形分配给消息符号或数字的序列来构建所发送的信号。 检测器要重建的基本数字信息由数字序列组成，每个数字信号持续一段固定的时间，如T秒，每个数字信号从任意一个固定大小的字母表中挑选出来。 例如，在二进制消息中，字母由数字0和1组成。在季后消息中，字母表由数字0,1,2和3组成。

公开(公告)号：US3931472A

公开(公告)日：1976-01-06

申请号：US467656

申请日：1974-05-07

申请人： Walter J. Gill ,  James A. Mellenger

发明人： Walter J. Gill ,  James A. Mellenger

IPC分类号： H04L5/12 ,  H04L25/03 ,  H04L27/20 ,  H04L27/227 ,  H04J3/06

CPC分类号： H04L27/2067 ,  H04L25/03866 ,  H04L27/2275 ,  H04L5/12 ,  Y10S370/914

摘要： A communications system and method for transmitting and receiving two independently timed (asynchronous) binary data signals on a quadriphase carrier. The four phase ambiguity ordinarily resulting from quadriphase transmission and reception is overcome by uniquely identifying one input channel, for example, by slightly increasing the clock rate of the channel. In reception each channel is demodulated and the data rate of each channel is examined to identify the increased clock rate channel. That channel is then returned to its original clock rate.

摘要翻译： 一种用于在四相载波上发送和接收两个独立定时（异步）二进制数据信号的通信系统和方法。 通常通过唯一地识别一个输入通道来克服通常由四相传输和接收产生的四相歧义，例如通过稍微增加信道的时钟速率。 在接收中，解调每个信道，并检查每个信道的数据速率以识别增加的时钟速率信道。 然后，该通道返回到其原始时钟速率。

公开(公告)号：US3826990A

公开(公告)日：1974-07-30

申请号：US32711273

申请日：1973-01-26

申请人： ORG EUROP DE RECH SPATIALES

发明人： PERA L

IPC分类号： H04L1/02 ,  H04L27/22 ,  H04L27/227 ,  H03D3/18

CPC分类号： H04L27/2275

摘要： A circuit arrangement to eliminate the phase ambiguity at a receive terminal in phase-shift keying binary transmission systems. The received PSK binary signal is simultaneously applied to a conventional synchronous demodulator and a so-called nonambiguous demodulator which may be in analog or digital form. The outputs from both demodulators are compared to provide a signal having a first state when both demodulator outputs are in phase and having a second state when said demodulator outputs are in phase opposition. Logic means are provided to detect the state of the comparison signal in order to control inverter means adapted to reverse the demodulated original message from the synchronous demodulator when said comparison signal is in its second state.

摘要翻译： 一种用于消除相移键控二进制传输系统中的接收终端处的相位模糊度的电路装置。 所接收的PSK二进制信号同时被应用于常规的同步解调器和可以是模拟或数字形式的所谓的非模糊解调器。 将两个解调器的输出进行比较，以提供当两个解调器输出同相并具有第二状态时具有第一状态的信号，当所述解调器输出相位相反时。 提供逻辑装置以检测比较信号的状态，以便当所述比较信号处于其第二状态时控制适于从同步解调器反转解调的原始消息的逆变器装置。

公开(公告)号：US3804985A

公开(公告)日：1974-04-16

申请号：US15458371

申请日：1971-06-18

申请人： NIKKON ELECTRIC CO LTD

发明人： MATSUO Y

IPC分类号： H04J3/06 ,  H04L5/12 ,  H04L27/20 ,  H04L27/227

CPC分类号： H04L27/2275 ,  H04L5/12 ,  H04L27/2075

摘要： A frame synchronization technique for a phase-difference modulation communication system. A carrier wave is phasedifference modulated in accordance with information signals emanating from a plurality of information channels and subsequently time-division multiplexed into a series of time frames. The time-division multiplexed signal is then stepwise phase difference modulated to provide a stepwise shift at a rate corresponding to the length of a time frame. This stepwise phase shift defines each time frame. In this manner frame synchronization can be accomplished without the use of additional frame synchronization pulses.

摘要翻译： 一种用于相位差调制通信系统的帧同步技术。 载波根据从多个信息信道发出的信息信号进行相位差调制，随后被时分复用为一系列时间帧。 然后对时分复用信号进行逐步相位差调制，以对应于时间长度的速率提供逐步移位。 该逐步相移定义每个时间帧。 以这种方式，可以在不使用附加帧同步脉冲的情况下实现帧同步。

公开(公告)号：US3798561A

公开(公告)日：1974-03-19

申请号：US3798561D

申请日：1971-09-24

申请人： BOCKER P

发明人： BOCKER P

IPC分类号： H04L27/18 ,  H04L27/227 ,  H03D3/18

CPC分类号： H04L27/2275

摘要： A method and apparatus are described for demodulating phase difference modulated signals wherein a carrier is modulated by specific, different valued phase shifts corresponding to the various levels of the data signal. Mean value-coherent demodulation is used wherein the transmitted predetermined interval and the phase resulting from the phases received up to that time as the mean value for the preceding predetermined interval. A reference frequency is generated which includes all the possible phase values for the data. A pulse is triggered by a crossover of the carrier signal during the predetermined interval. At the time of the latter crossover, the phase of the received signal is compared with the mean value of phase values received during preceding predetermined intervals. A decoder is provided which, according to the coding used, forms the transmitted data signal from the aforementioned difference information.

摘要翻译： 描述了一种用于解调相位差调制信号的方法和装置，其中通过对应于数据信号的各种级别的特定不同值移相调制载波。 使用平均值相干解调，其中发送的预定间隔和从相位接收到的相位作为前一预定间隔的平均值。 产生包括数据的所有可能相位值的参考频率。 在预定间隔期间由载波信号的交叉触发脉冲。 在后一个交叉时，将接收信号的相位与在先前预定间隔期间接收的相位值的平均值进行比较。 提供一种解码器，根据所使用的编码，根据上述差分信息形成发送的数据信号。

公开(公告)号：US3739289A

公开(公告)日：1973-06-12

申请号：US3739289D

申请日：1971-08-30

申请人： SIEMENS AG

发明人： BOCHMANN K

IPC分类号： H04L27/18 ,  H04L27/227 ,  H04L27/22

CPC分类号： H04L27/2275

摘要： A circuit is described for demodulating phase difference modulated carrier signals. In particular for demodulating binary coded data, which are transmitted over a carrier frequency through certain phase shifts assigned, respectively, to the various data levels. A reference oscillator is provided in the demodulator for emitting a reference frequency signal having as many phases as there are phase states which have been established for message transmission. A timing generator is adjusted to produce a scanning pulse between two phase shifts, which scanning pulse has a minimum duration equal to the period of the carrier frequency. A first store is activated for the time duration of the scanning pulse. A gating pulse is generated from a crossover of the received carrier signal during the duration of the scanning pulse, and this facilitates the input of the reference phase from the reference oscillator agreeing with the carrier phase, in binary form, into the first store. Before the next scanning pulse occurs, the binary value in the first store is transferred to a second store. A decoder is provided for forming a difference value from the values in the two stores.

摘要翻译： 描述了用于解调相位差调制载波信号的电路。 特别地，用于解调通过载波频率通过分配的某些相移分别发送到各种数据级的二进制编码数据。 在解调器中提供参考振荡器，用于发射具有已经建立用于消息传输的相位状态的具有多个相位的参考频率信号。 调整定时发生器以产生两个相移之间的扫描脉冲，扫描脉冲具有等于载波频率周期的最小持续时间。 在扫描脉冲的持续时间内，第一个存储被激活。 在扫描脉冲的持续时间期间，从接收到的载波信号的交叉产生选通脉冲，这有助于将基准振荡器的二进制形式的载波相位的参考振荡器输入到第一存储器中。 在发生下一个扫描脉冲之前，第一个存储中的二进制值被传送到第二个存储。 提供了一个解码器，用于形成与两个商店中的值的差值。

公开(公告)号：US3456193A

公开(公告)日：1969-07-15

申请号：US3456193D

申请日：1966-08-19

申请人： NASA

发明人： MUNOZ ROBERT M

IPC分类号： H04L27/20 ,  H04L27/227 ,  H04J3/04

CPC分类号： H04L27/2275 ,  H04L27/206

公开(公告)号：US3312901A

公开(公告)日：1967-04-04

申请号：US32115663

申请日：1963-11-04

申请人： BELL TELEPHONE LABOR INC

发明人： BECKER FLOYD K ,  SALTZBERG BURTON R

IPC分类号： H03D1/22 ,  H03D1/24 ,  H04L27/06 ,  H04L27/227

CPC分类号： H03D1/24 ,  H03D1/22 ,  H04L27/066 ,  H04L27/2275

公开(公告)号：US3242262A

公开(公告)日：1966-03-22

申请号：US13977261

申请日：1961-09-21

申请人： IBM

发明人： MICHAEL MELAS CONSTANTIN ,  EMIL HOPNER

IPC分类号： H04L27/20 ,  H04L27/227

CPC分类号： H04L27/2071 ,  H04L27/2275