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公开(公告)号：US4776012A
公开(公告)日：1988-10-04
申请号：US39340
申请日：1987-04-17
IPC分类号： H04B1/7075 , H04L9/04
CPC分类号： H04B1/70756
摘要： The present invention is concerned with an apparatus and a method of jumping a composite PN code from a current phase position to a desired predetermined phase position so as to enhance acquisition of a composite PN code. The apparatus includes a plurality of individual PN code generators which are connected to a code combiner to produce a composite PN code. Each of the individual PN code generators is driven by its own timing gate for supplying synchronized clock pulses to its own PN code generator. A master clock is connected to a timing gate before being connected to the individual PN code generators. An inhibit input at each of the individual timing gates is provided so that the individual PN generators may be inhibited a predetermined number of clock pulses which causes the PN code generated to be inhibited and has the effect of jumping the PN code a desired number of phase positions.
摘要翻译： 本发明涉及将复合PN码从当前相位位置跳转到期望的预定相位位置的装置和方法，以便增强复合PN码的采集。 该装置包括多个单独的PN码发生器，其连接到码组合器以产生复合PN码。 每个PN码发生器由其自己的定时门驱动，用于向其自身的PN码发生器提供同步的时钟脉冲。 在连接到各个PN码发生器之前，主时钟连接到定时门。 提供每个各个定时门处的禁止输入，使得各个PN发生器可以被禁止预定数量的时钟脉冲，这导致产生的PN码被禁止并且具有跳转PN码所需数量的相位的效果 职位
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公开(公告)号：US4817113A
公开(公告)日：1989-03-28
申请号：US44632
申请日：1987-05-01
CPC分类号： H04B1/7075 , G01S11/02
摘要： A method of rapidly reacquiring a pseudonoise spread spectrum coded signal after short outages includes calculating the new positions of the moving stations relative to the old positions of the moving stations and for determining the accurate displacement and the accurate direction the platforms have moved in their new direction after a short time outage. The method includes calculating a triangle which includes the displacement between the moving stations' old position and the moving stations new position and the included angle between the direction of movement and the line of sight between said moving platforms at the time of outage. A range displacement adjustment is calculated on the basis of the triangle for each moving station and the range factor resulting from this calculation is applied to the PN generators of the receiver and transmitter in each of the moving stations to independently adjust for each station's movement. The directional antennas of the moving stations are pointed in new directions toward the area in which the other moving station will be found. The directional antennas are moved simultaneously toward each other and a sweep or reacquisition adjustment of the PN generators of each moving station is made employing a small window of uncertainty which results in reacquisition of the PN coded signal being transmitted from the other station.
摘要翻译： 在短暂停机后快速重新获取伪噪声扩频编码信号的方法包括计算移动站相对于移动站的旧位置的新位置，并确定平台在新方向上移动的精确位移和准确方向 经过短暂的中断。 该方法包括计算三角形，该三角形包括移动台的旧位置与移动台之间的新位置之间的位移以及在停机时所述移动平台之间的运动方向与视线之间的夹角。 基于每个移动站的三角形来计算范围位移调整，并且由该计算得到的范围因子被应用于每个移动站中的接收机和发射机的PN发生器，以独立地调整每个站的运动。 移动台的定向天线指向另一个移动站将被发现的区域的新方向。 定向天线同时朝向彼此移动，并且使用小的不确定窗口来进行每个移动站的PN发生器的扫描或重新捕获调整，这导致从另一个站发送的PN编码信号的重新获取。
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公开(公告)号：US4441194A
公开(公告)日：1984-04-03
申请号：US379597
申请日：1982-05-19
IPC分类号： H04B1/7093 , H04L25/06 , H04L27/233 , H03D3/06
CPC分类号： H04B1/7093 , H04L25/067 , H04L27/2334
摘要： A non-coherent receiving system is provided with a novel triple-bit matched filter detector system which provides two outputs indicative of the data stream being detected. A preliminary or soft decision is made concerning the state of the bits in the data stream. One of the outputs provides a best estimate of state of the data bit being detected and the other output provides the second best estimate of the state of the data bits being detected. The incoming data stream is processed and modified as it is shifted through a plurality of shift registers in real time employing the data bits subsequently detected. A controller is provided to make a plurality of predetermined evaluations of the state of the bits in the data stream and to provide a final or hard decision of the correct state of the data bits previously detected.
摘要翻译： 非相干接收系统具有新颖的三比特匹配滤波器检测器系统，其提供指示被检测的数据流的两个输出。 对数据流中的位的状态进行初步或软判决。 其中一个输出提供了被检测的数据位的状态的最佳估计，而另一个输出提供了正被检测的数据位的状态的第二最佳估计。 当采用随后检测到的数据位实时地移入多个移位寄存器时，对输入数据流进行处理和修改。 提供控制器以对数据流中的位的状态进行多个预定评估，并提供对先前检测到的数据位的正确状态的最终或硬判决。
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公开(公告)号：US4397034A
公开(公告)日：1983-08-02
申请号：US247686
申请日：1981-03-26
IPC分类号： H04K1/00
CPC分类号： H04K1/00
摘要： A system for transmitting desired information is provided which has a very low probability of being intercepted. The system combines a well known narrow bandwidth directional antenna for limiting the interception of the main beam information signal with a novel random noise generated signal which guarantees that the sidelobe signals which also contain the desired information cannot be distinguished as information signals.
摘要翻译： 提供了一种用于发送所需信息的系统，其具有非常低的拦截概率。 该系统组合了众所周知的窄带宽定向天线，用于限制主波束信息信号的截取与新颖的随机噪声产生信号，这保证了还包含所需信息的旁瓣信号不能被区分为信息信号。
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公开(公告)号：US5257282A
公开(公告)日：1993-10-26
申请号：US625497
申请日：1984-06-28
CPC分类号： H04L9/0662 , H04L2209/125
摘要： A novel low speed code sequence generator having a set of parallel flip-flops is provided and comprises a vector generator in series between the outputs and the inputs of the set of parallel flip-flops in the generator. The outputs from the low speed code sequence generator may be multiplexed together to provide an individual high speed code sequence. The selective outputs from a plurality of low speed code sequence generators may be algebraically combined and then multiplexed together to provide a composite code sequence.
摘要翻译： 提供了一种具有一组并行触发器的新颖的低速码序列发生器，其包括串联在输出端和发生器中并联触发器组的输入端之间的矢量发生器。 来自低速码序列发生器的输出可以被复用在一起以提供单独的高速码序列。 来自多个低速码序列发生器的选择性输出可以被代数组合，然后被多路复用在一起以提供复合码序列。
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公开(公告)号：US4817001A
公开(公告)日：1989-03-28
申请号：US39339
申请日：1987-04-17
CPC分类号： G01S13/785 , G01S13/87 , G01S7/295
摘要： In a two way ranging system of the type employing pseudonoise spread spectrum codes there is provided a method for correcting the navigational system of one of two moving stations in space to compensate for relative drift. The point positions of the two stations are calculated by the on-board navigation systems of the individual stations at a first and subsequently at a second position after relative movement. The range from station 1 to station 2 is calculated employing the highly accurate pseudonoise communications ranging systems. The range uncertainty of the range calculation and the trigonmetric relation of the two calculated ranges and the include angle between the line of sight of the range directions is employed to calculate a range of uncertainty parallelogram more accurate that the navigation systems. When a station's point position is indicated by its navigation system to be outside the parallelogram, the navigation system is corrected to compensate for relative drift.
摘要翻译： 在采用伪噪声扩频码的类型的双向测距系统中，提供了一种用于校正空间中的两个移动站之一的导航系统以补偿相对漂移的方法。 两个站的点位置在相对运动之后的第一个位置和随后的第二个位置处由各个车站的车载导航系统计算。 使用高度准确的伪噪声通信测距系统计算从站1到站2的范围。 使用范围计算的范围不确定度和两个计算范围的三角关系以及范围方向的视线之间的包括角度来计算导航系统更准确的不确定性平行四边形范围。 当其导航系统指示站点的位置在平行四边形之外时，校正导航系统以补偿相对漂移。
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公开(公告)号：US4513285A
公开(公告)日：1985-04-23
申请号：US289688
申请日：1981-08-03
CPC分类号： G01S13/79
摘要： An accurate radio frequency ranging system is provided for measuring the time required for a signal to be transmitted from a ground station to a remote station and to be returned to the ground station. The ground station is provided with a master reference clock that is employed to drive a first pseudonoise generator. The ranging system in the ground station is started by a unique and predetermined start epoch signal produced by the first pseudonoise generator. The first pseudonoise generated signals are transmitted to the remote station where they are tracked and sensed. When the original start epoch signal is sensed at the remote station, it is employed as a trigger or read signal to initiate the generation of a stop epoch signal. The stop epoch signal is retransmitted to the ground station and stored in a register where it is compared with pseudonoise generated signals being retransmitted from the remote station to the ground station. When the correlation between the two signals occurs, a new epoch stop signal is produced which stops the timing of the ranging system in the ground station. Since the pseudonoise generated signals transmitted from the remote station to stop the ranging system in the ground station are not locked on to the pseudonoise signals being transmitted from the ground station to the remote station, there is no requirement for turn-around coherency.
摘要翻译： 提供了一种精确的射频测距系统，用于测量从地面站到远程站发送信号所需的时间并返回到地面站。 地面站设置有用于驱动第一伪噪声发生器的主参考时钟。 地面站中的测距系统由第一伪噪声发生器产生的唯一且预定的起始时刻信号启动。 第一个伪噪声产生的信号被发送到远程站，在那里它们被跟踪和感测。 当在远程站处感测到原始开始纪元信号时，它被用作触发或读取信号来启动停止时期信号的产生。 停止时标信号被重新发送到地面站并存储在寄存器中，在该寄存器中，与从远程站重发的伪噪声产生的信号与地面站进行比较。 当发生两个信号之间的相关时，产生一个新的停止信号，停止地面站中测距系统的定时。 由于从远程站发送的伪噪声信号停止地面站中的测距系统并未锁定在从地面站向远程站发送的伪噪声信号，所以不需要转向一致性。
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公开(公告)号：US4394642A
公开(公告)日：1983-07-19
申请号：US304434
申请日：1981-09-21
CPC分类号： G06F7/76 , H03M13/271 , H03M13/2785
摘要： A novel interleaver-de-interleaver is provided which is adapted to store bits of a data stream after being error encoded. The data bits are stored in a random access memory in addresses identifiable by an array of columns and rows. The interleaver comprises address pointer means and logic for reading the data bits out of the memory addresses in a predetermined reordered sequence to provide a quasi-random pattern sequence of data bits which when transmitted are substantially immune to periodic bursts of radio frequency interference signals.
摘要翻译： 提供了一种新颖的交错器去交错器，其适于在错误编码之后存储数据流的位。 数据位存储在随机访问存储器中，地址可由列和行数组标识。 交织器包括地址指针装置和用于以预定的重排序列从存储器地址中读出数据位的逻辑，以提供数据比特的准随机模式序列，当被发送时基本上不受周期性的射频干扰信号的突发的影响。
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公开(公告)号：US4225935A
公开(公告)日：1980-09-30
申请号：US830274
申请日：1977-08-30
CPC分类号： H04K1/00 , H04L9/0668
摘要： A coding system produces a code with enhanced acquisition security by generating a plurality of linear component codes, C.sub.1, C.sub.2, . . . C.sub.n, combining the component codes in accordance with a modulo-2 addition rule to form a linear first composite code, nonlinearizing the first composite code to form a nonlinear second composite code, time delaying the component codes, C.sub.1, C.sub.2, . . . C.sub.n-1, and combining the time delayed codes with the nonlinear second composite code in accordance with a Boolean majority voting rule to form a nonlinear acquisition composite code. Acquisition of the nonlinear acquisition composite code is achieved by generating a plurality of linear reference component codes, R.sub.1, R.sub.2, . . . R.sub.n, that correlate respectively with the linear acquisition component codes, C.sub.1, C.sub.2, . . . C.sub.n, combining the reference component codes in accordance with the modulo-2 addition rule to form a linear third composite code, nonlinearizing the third composite code to form a nonlinear fourth composite code, time delaying the reference component codes, R.sub.1, R.sub.2 , . . . R.sub.n-1, correlating the time delayed codes with the nonlinear acquisition composite code by shifting the phases of the time delayed codes, and correlating the fourth composite code with the acquisition composite code by shifting the phase of the reference component code, R.sub.n.
摘要翻译： 编码系统通过产生多个线性分量代码C1，C2，产生具有增强的采集安全性的代码。 。 。 Cn，根据模2加法规则组合分量代码以形成线性第一复合码，使第一复合码非线性化以形成非线性第二复合码，时间延迟分量码C1，C2。 。 。 Cn-1，并且根据布尔多数投票规则将时间延迟码与非线性第二复合码组合以形成非线性采集复合码。 通过生成多个线性参考分量代码R1，R2来获得非线性采集复合码的获取。 。 。 Rn分别与线性采集分量代码C1，C2相关。 。 。 Cn，根据模2加法规则组合参考分量代码以形成线性第三复合码，使第三复合码非线性化以形成非线性第四复合码，延时参考分量码R1，R2。 。 。 Rn-1，通过移位时间延迟码的相位将时间延迟码与非线性采集复合码相关联，并通过移位参考分量码Rn的相位将第四复合码与采集合成码进行相关。
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公开(公告)号：US4890297A
公开(公告)日：1989-12-26
申请号：US259660
申请日：1988-10-19
摘要： The present invention provides a novel burst erasing automatic gain control circuit which includes the basic elements of an automatic gain control circuit and further includes in the loop control circuit, slow response wideband filter means, and a hard limiter which limits the AGC'ed output from the amplifier so that the signal reaching the slow response wideband filter means never exceeds a predetermined value which would cause distortion in the feedback loop. The output of the novel automatic gain control circuit is coupled to a despreading circuit which removes substantially all of the remaining burst jamming signals.
摘要翻译： 本发明提供了一种新颖的脉冲串擦除自动增益控制电路，其包括自动增益控制电路的基本元件，并且还包括在环路控制电路，慢响应宽带滤波器装置和限制AGC的输出的硬限幅器 使得到达慢响应宽带滤波器的信号意味着从不超过将导致反馈回路中的失真的预定值。 新颖的自动增益控制电路的输出耦合到解扩电路，其去除了基本上所有剩余的突发干扰信号。
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