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公开(公告)号：US5504787A
公开(公告)日：1996-04-02
申请号：US216744
申请日：1994-03-23
IPC分类号： H04B1/7075 , H04L7/00
CPC分类号： H04B1/7075
摘要： Apparatus and a method for increasing the speed of acquisition of PN coded signals includes a novel PN code clock extraction circuit which is coupled in parallel to a code tracking loop and acquisition loop of a PN receiver of the type having a replica PN code generator which is slip controlled to synchronize with the received PN coded signals. The novel PN code clock extraction circuit detects the clock transition of the received PN coded signals and synchronized the replica PN code generator clock transition signals so that there is no misalignment during acquisition. A switch control in the acquisition loop circuit senses the synchronization of the replica PN code generator transition and the received PN code transition and disconnects the PN code clock extraction circuit after synchronization of clock transition and before acquisition of the PN code so that the acquisition loop detects the PN code synchronization with a full strength signal.
摘要翻译： 用于提高PN编码信号的采集速度的装置和方法包括一个新颖的PN码时钟提取电路，其并行耦合到具有复制PN码发生器的类型的PN接收机的码跟踪环路和采集环路， 滑动控制与所接收的PN编码信号同步。 新颖的PN码时钟提取电路检测接收的PN编码信号的时钟转换，并同步复制PN码发生器时钟转换信号，使得在采集期间不存在未对准。 采集环路电路中的开关控制检测复制PN码发生器转换和接收到的PN码转换的同步，并且在PN时钟转换同步之后和PN码的获取之前断开PN码时钟提取电路，使得采集环路检测到 PN码与全强度信号同步。
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公开(公告)号：US5222100A
公开(公告)日：1993-06-22
申请号：US903407
申请日：1992-06-24
IPC分类号： H04B1/7075 , H04B1/7077 , H04B1/708 , H04B1/709
CPC分类号： H04B1/70775 , H04B1/70758 , H04B1/709 , H04B1/70755 , H04B1/708
摘要： A novel range based acquisition system includes a receiver for receiving PN encoded signals coupled to a novel range based variable dwell correlator which detects and acquires uniquely timed received transmitter PN encoded signals employing different search dwell times for each of the estimated ranges from which the receiver transmitted PN encoded signals are being propagated so as to enhance the speed of acquisition of said PN encoded signals.
摘要翻译： 一种新颖的基于范围的采集系统包括一个接收器，用于接收耦合到新的基于范围的可变驻留相关器的PN编码信号，该相关器检测并获取对于接收器发射的估计范围中的每一个采用不同搜索驻留时间的唯一定时接收的发射机PN编码信号 正在传播PN编码的信号以增强所述PN编码信号的采集速度。
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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：US5414730A
公开(公告)日：1995-05-09
申请号：US170604
申请日：1993-12-21
IPC分类号： H04B1/7073 , H04B1/7075 , H04B1/708 , H04B1/709 , H04K1/00
CPC分类号： H04B1/70752 , H04B1/708 , H04B1/70735 , H04B1/709
摘要： A novel PN code acquisition and demodulation circuit comprise an analog receiver coupled to an analog to digital converter. The digital output of the converter is passed through an N chip width parallel correlator. The parallel outputs are coherently accumulated to provide N soft decision data values one of which is indicative of the proper replica code for locking onto the data. All of the soft decision data values are stored in a high speed memory in real time. Subsequently non-coherent accumulated soft decision data is employed to detect the proper PN replica code. Logic selection means accesses the soft decision data stored in the high speed memory in non real time and selects the best estimate for the soft decision data and applies the soft decision data to a demodulator in non-real time to recover the hard data encoded in the received PN coded data.
摘要翻译： 一种新颖的PN码采集和解调电路包括耦合到模数转换器的模拟接收器。 转换器的数字输出通过N个芯片宽度的并行相关器。 并行输出被相干地累积以提供N个软判决数据值，其中一个指示用于锁定到数据上的适当副本代码。 所有软判决数据值实时存储在高速存储器中。 随后采用非相干累加软判决数据来检测正确的PN复制码。 逻辑选择装置以非实时的方式存取高速存储器中的软决策数据，并选择软判决数据的最佳估计，并以非实时的方式将软决策数据应用于解调器，以恢复编码在 接收到PN编码数据。
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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：US5559788A
公开(公告)日：1996-09-24
申请号：US366198
申请日：1994-12-29
CPC分类号： H04J13/00 , H04J13/0022 , H04J13/10
摘要： A transmitter is provided which simultaneously transmits waveforms such as with different data rates. These transmissions are modulated (e.g. phase modulated) onto quadrature channels of a common carrier, and are then combined. The resulting composite modulated waveform is upconverted to RF, power amplified, split and routed to separate ports for transmission. The transmitted signals are then received, downconverted and demodulated to produce the original signals.
摘要翻译： 提供了一种发送器，它同时发送不同数据速率的波形。 这些传输被调制（例如，相位调制）到公共载波的正交信道上，然后被组合。 所得到的复合调制波形上变频到RF，功率放大，分离和路由到分离端口进行传输。 然后发送的信号被接收，下变频和解调以产生原始信号。
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公开(公告)号：US5299229A
公开(公告)日：1994-03-29
申请号：US10723
申请日：1993-01-29
IPC分类号： H04K1/02 , H04B1/7085 , H04L27/30
CPC分类号： H04B1/7085
摘要： A high PN code rate receiving system is provided for receiving, recovering and tracking a high rate PN composite code comprising a low rate PN code combined with a high rate PN code and wherein the receiving system comprises a broad band receiver for receiving the high rate PN composite code and further includes a data recovery channel and a tracking loop channel. The data recovery channel comprises a high rate mixer and a low rate mixer for removing the high data rate component code and the low data rate component code to provide a low data rate data stream. The tracking loop channel comprises a high rate early-late tracking system for producing a high rate error signal and further comprises a low rate portion of the tracking loop for producing a low rate error signal which is combined with the data output to provide a clock error signal. The clock error signal is applied to a voltage controlled oscillator to produce a low data rate clock and a high data rate clock which are coupled to a low data rate code generator and a high data rate code generator which synchronize the tracking loop and said data channel.
摘要翻译： 提供高PN码率接收系统用于接收，恢复和跟踪包括与高速率PN码组合的低速率PN码的高速率PN复合码，并且其中接收系统包括用于接收高速率PN 并且还包括数据恢复通道和跟踪循环通道。 数据恢复通道包括用于去除高数据速率分量代码和低数据速率分量代码以提供低数据速率数据流的高速率混频器和低速率混频器。 跟踪环通道包括用于产生高速率误差信号的高速率早期跟踪系统，并且还包括用于产生低速率误差信号的跟踪环路的低速率部分，该低速率误差信号与数据输出相结合以提供时钟误差 信号。 时钟误差信号被施加到压控振荡器以产生低数据速率时钟和高数据速率时钟，该数据速率时钟和高数据速率时钟耦合到低数据速率代码发生器和高数据速率代码发生器，其使跟踪环路和所述数据通道同步 。
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公开(公告)号：US4827269A
公开(公告)日：1989-05-02
申请号：US882838
申请日：1986-07-07
CPC分类号： H01Q1/18 , H01Q21/245
摘要： An apparatus for maintaining an arbitrary orientation of the polarization of an antenna, such as an airborne microwave antenna, by using antenna pointing information and platform (aircraft) attitude information to position the input/feed signal.
摘要翻译： 一种用于通过使用天线指向信息和平台（飞机）姿态信息来维持诸如机载微波天线的天线的极化的任意取向的设备，以定位输入/馈送信号。
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公开(公告)号：US4809295A
公开(公告)日：1989-02-28
申请号：US40526
申请日：1987-04-20
CPC分类号： H04J13/105 , H04L9/0662 , H04L2209/805
摘要： Apparatus and a method of generating very very long pseudonoise (PN) spread spectrum codes is provided where the code is so long that it need never repeat itself during actual use. The transmitter is adapted to start to transmit one set of a plurality of component codes as a composite code having correlation properties with the component codes. When the first set of component codes are acquired at the receiver the composite code is then transmitted as a component of a different composite code which contains the previous composite code and a second new set of component codes which have correlation properties with the new set of component codes. When the second set of component codes are acquired by the receiver the composite code is then transmitted as a third new and different composite code which contains a third new set of component codes which have correlation properties with third new set of component codes. When the third new set of component set of codes is required the transmitter is already transmitting a very very long composite code but may lengthen the composite code by employing further set of component codes or may continue to transmit the very very long composite code without having any correlation properties with any of the component codes being transmitted.
摘要翻译： 提供了一种生成非常长的伪噪声（PN）扩频码的装置和方法，其中代码很长，以致在实际使用期间它不需要重复。 发射机适于开始发送一组多个分量码，作为具有与分量码相关性的组合码。 当在接收机处获取第一组分量代码时，复合代码然后作为包含先前复合代码的不同复合代码的分量被发送，并且第二组新的组件代码与新的组件集合具有相关属性 代码。 当接收机获取第二组分量代码时，复合代码随后作为第三新的和不同的复合代码被发送，该复合代码包含具有与第三组新组件代码相关性的第三组新组件代码。 当需要第三组新的组件组件时，发送器已经在发送非常长的组合代码，但可以通过采用另外的组件代码集合来延长组合代码，或者可以继续发送非常长的组合代码，而不需要任何 与要发送的任何组件代码的相关性。
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10.发明授权
公开(公告)号：US5598154A
公开(公告)日：1997-01-28
申请号：US348669
申请日：1994-12-02
CPC分类号： H04B1/707 , H04J13/0022 , H04J13/10
摘要： A set of independent pseudonoise (PN) component codes greater than two are combined in a manner which produces one or more I and Q uncorrelated orthogonal pairs of resulting combined PN sequences. At least two of the component codes in a resulting combined PN sequence are combined in a manner which produces an overall imbalance of ones and zeros in the binary expression of the resulting combined PN sequence so that the resulting composite code has a partial correlation with a predetermined one of the PN component codes. In the preferred embodiment, three component codes are combined to produce uncorrelated orthogonal pairs of composite codes wherein at least one of the pairs of composite codes is produced to have a partial correlation with one or more of the component codes.
摘要翻译： 大于2的独立伪噪声（PN）分量码的集合以产生所得到的组合PN序列的一个或多个I和Q不相关的正交对的方式组合。 所得到的组合PN序列中的至少两个分量代码以产生组合PN序列的二进制表达式中产生1和0的整体不平衡的方式组合，使得所得到的合成代码与预定的 一个PN组件代码。 在优选实施例中，组合三个分量代码以产生不相关的复合码正交对，其中产生所述复合码对中的至少一个与部分码中的一个或多个部分相关。
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