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公开(公告)号：US5029235A
公开(公告)日：1991-07-02
申请号：US286188
申请日：1988-12-19
IPC分类号： H01P9/00
CPC分类号： H01P9/00
摘要： An electromagnetic dispersive delay line (10) includes a dielectric strip (28) as well as a coupler (24, 34, 36, and 38) for launching surface electromagnetic waves into the dielectric strip. The upper surface of the dielectric strip (28) is left exposed to the air in order to provide an interface with a lower-permittivity medium of propagation. This permits a surface-electromagnetic-wave propagation mode. The thickness of the dielectric strip (28) is varied along its length so as to result in a linear relationship of delay to frequency throughout a predetermined frequency range. Preferably, a conductive strip (26) spaced from the dielectric strip extends along the surface-wave propagation path in the region occupied by the evanescent field external to the dielectric strip (28). This conductive strip (26) modifies the phase relationships between the electric and magnetic fields in the evanescent-field region so as to cause some of the power transmission to occur outside of the dielectric strip. This modifies the dispersion curve so as to extend the bandwidth of significant dispersion.
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公开(公告)号：US4808950A
公开(公告)日：1989-02-28
申请号：US916072
申请日：1986-10-06
IPC分类号： H01P9/00
CPC分类号： H01P9/00
摘要： An electromagnetic dispersive delay line (10) includes a dielectric strip (28) as well as a coupler (24, 34, 36, and 38) for launching surface electromagnetic waves into the dielectric strip. The upper surface of the dielectric strip (28) is left exposed to the air in order to provide an interface with a lower-permittivity medium of propagation. This permits a surface-electromagnetic-wave propagation mode. The thickness of the dielectric strip (28) is varied along its length so as to result in a linear relationship of delay to frequency throughout a predetermined frequency range. Preferably, a conductive strip (26) spaced from the dielectric strip extends along the surface-wave propagation path in the region occupied by the evanescent field external to the dielectric strip (28). This conductive strip (26) modifies the phase relationships between the electric and magnetic fields in the evanescent-field region so as to cause some of the power transmission to occur outside of the dielectric strip. This modifies the dispersion curve so as to extend the bandwidth of significant dispersion.
摘要翻译： 电磁色散延迟线（10）包括介质条（28）以及用于将表面电磁波发射到介质条中的耦合器（24,34,36和38）。 介质条（28）的上表面暴露于空气中，以提供与介电常数较低的介质的界面。 这允许表面电磁波传播模式。 介质条（28）的厚度沿其长度变化，以便在整个预定频率范围内导致延迟与频率的线性关系。 优选地，与电介质条隔开的导电条（26）沿着由介电条（28）外部的消逝场所占据的区域中的表面波传播路径延伸。 该导电条（26）修改了消逝场区域中的电场和磁场之间的相位关系，从而使一些电力传输发生在介质条的外部。 这样可以改变色散曲线，以扩大色散带宽。
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公开(公告)号：US06366627B1
公开(公告)日：2002-04-02
申请号：US06536592
申请日：1983-09-28
IPC分类号： H04B169
CPC分类号： H04B1/1638 , H04B1/62
摘要： A compressive receiver including a dispersive delay line (10) and a frequency translator (16, 18) is preceded by signal compressors (22a-d) that record the incoming signals at one speed and play them back at a higher speed. This increases the frequency spread and provides greater frequency resolution at the output of the receiver.
摘要翻译： 包括色散延迟线（10）和频率转换器（16,18）的压缩接收器的前面是信号压缩器（22a-d），其以一个速度记录输入信号并以更高的速度播放它们。 这增加了频率扩展，并在接收机的输出端提供了更高的频率分辨率。
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公开(公告)号：US4633257A
公开(公告)日：1986-12-30
申请号：US551664
申请日：1983-11-14
CPC分类号： G01S3/16
摘要： A system for indicating the direction of a source of radio waves received by a circular antenna array (12) includes a Butler matrix (18) that receives the array outputs and feeds the resultant matrix outputs to correction circuits (22) whose transfer functions are the inverses of the direction-independent factors of antenna patterns generated by antenna elements driven at relative phases that advance around the array at rates that complete an integral number of cycles in one circuit of the array. The resultant corrected signals are fed to a compressive receiver (26), which accordingly generates an output on an output port whose position indicates the direction of the source of the signal.
摘要翻译： 用于指示由圆形天线阵列（12）接收的无线电波源的方向的系统包括接收阵列输出并将所得到的矩阵输出馈送到校正电路（22）的巴特勒矩阵（18），校正电路（22）的传递函数为 由在阵列的一个电路中完成整数个周期的速率的相对相位驱动的天线元件产生的天线方向的方向独立因子的反转。 所得到的校正信号被馈送到压缩接收器（26），其相应地在其位置指示信号源的方向的输出端口上产生输出。
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公开(公告)号：US4733237A
公开(公告)日：1988-03-22
申请号：US689524
申请日：1985-01-07
摘要： A device for determining the frequency range and chirp rate of chirp radars or other sources of frequency-modulated signals includes a compressive receiver (16, 22, 24) for time-compressing single-frequency signals and a discriminator (26) for generating an output that represents the instantaneous frequency of the compressive-receiver output. For narrow-band signals, the frequency-modulated components in the output of the compressive receiver do not last long enough to cause a response from the discriminator (26). When the input of the compressive receiver is a chirp signal, on the other hand, the resultant compressive-receiver output lasts long enough to cause a discriminator response, and its time of occurrence and rate of frequency change are indications of the frequency range and chirp rate of the compressive-receiver input. The discriminator (26) accordingly generates an output whose slope is an indication of the chirp rate of the compressive-receiver input.
摘要翻译： 用于确定啁啾雷达或其他频率调制信号源的频率范围和啁啾率的装置包括用于时间压缩单频信号的压缩接收机（16,22,24）和用于产生输出的鉴频器（26） 表示压缩接收机输出的瞬时频率。 对于窄带信号，压缩接收机的输出中的调频分量不会持续足够长的时间来引起鉴别器（26）的响应。 另一方面，当压缩接收机的输入是线性调频信号时，所得到的压缩接收机输出持续足够长的时间以产生鉴别器响应，并且其发生时间和频率变化率是频率范围和啁啾指示 压缩接收机输入的速率。 鉴别器（26）相应地产生其斜率是压缩接收器输入的啁啾率的指示的输出。
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公开(公告)号：US4656642A
公开(公告)日：1987-04-07
申请号：US601453
申请日：1984-04-18
CPC分类号： H04B1/69 , H04L27/103
摘要： In a spread-spectrum direction-finding system, the outputs of the several antenna elements (10a-d) are progressively translated in frequency by a chirped local oscillator (14) and mixers (12a-d) and applied to a two-dimensional dispersive filter (18), which time compresses the results of single-frequency components in the antenna-element outputs to narrow pulses. Limiters (24a-d) remove any strong narrow-band components that are compressed by the dispersive delay line (18) so that further processing to detect a spread-spectrum signal is not degraded by the presence of narrow-band signals. The use of a common two-dimensional delay line (18) to provide the time compression avoids the need to maintain phase tracking among a plurality of separate parallel one-dimensional dispersive delay lines.
摘要翻译： 在扩频方向调查系统中，几个天线元件（10a-d）的输出通过啁啾的本地振荡器（14）和混频器（12a-d）逐渐地转换并施加到二维色散 滤波器（18），其将天线元件输出中的单个频率分量的结果压缩成窄脉冲。 限制器（24a-d）去除由色散延迟线（18）压缩的任何强窄带分量，使得检测扩频信号的进一步处理不会由于存在窄带信号而降级。 使用公共二维延迟线（18）来提供时间压缩避免了在多个分离的并行一维色散延迟线之间维持相位跟踪的需要。
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公开(公告)号：US4305159A
公开(公告)日：1981-12-08
申请号：US871297
申请日：1978-01-23
IPC分类号： G01R23/165 , H03J7/32 , H04B1/16 , H04B17/00
CPC分类号： G01R23/165 , H03J7/32
摘要： The envelope detector of a compressive receiver is replaced with either a Fourier Transform device or a demodulator such that the output of the dispersive delay line utilized in the receiver is processed to yield the spectrum of the incoming signals and/or the modulation impressed on the incoming signals, thus to permit rapid identification of a signal and its source. In order to permit spectral analysis and/or demodulation of many signals over wide bandwidths, an especially wide bandwidth dispersive delay line is utilized along with a sweep-to-sweep phase coherent variable frequency oscillator.
摘要翻译： 压缩接收机的包络检测器被替换为傅立叶变换装置或解调器，使得在接收机中使用的色散延迟线的输出被处理以产生输入信号的频谱和/或施加在输入端的调制 信号，从而允许快速识别信号及其信号源。 为了允许在宽带宽上进行许多信号的频谱分析和/或解调，使用特别宽的带宽色散延迟线以及扫掠相位相干可变频率振荡器。
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公开(公告)号：US4247939A
公开(公告)日：1981-01-27
申请号：US959397
申请日：1978-11-09
CPC分类号： H04B1/71 , H04B1/707 , H04B1/7087
摘要： A spread spectrum detector utilizes compressive receiver techniques and squaring of the incoming signal to detect the presence of a spread spectrum signal and to obtain its center frequency, with the squaring cancelling the pseudo-random code. Once having determined the center frequency, the gated output of the compressive receiver's dispersive delay line may be directly demodulated without resort to code correlation, by applying the output of the dispersive delay line to a narrowband filter set to the detected center frequency. Narrowband interfering signals are rejected by a continuous comb filter, hard limiters for the filter outputs and a summing device. The same narrowband signal rejection can be accomplished by hard limiting the output of the compressive receiver delay line and then returning to the time domain with an additional dispersive delay line having a dispersive characteristic inverse to that of the compressive receiver delay line. Pseudo-random quadrature phase shifts may be cancelled out by raising the incoming signal to the fourth power.
摘要翻译： 扩频检测器利用压缩接收机技术和输入信号的平方来检测扩频信号的存在并获得其中心频率，其中平方消除伪随机码。 一旦确定了中心频率，压缩接收机的色散延迟线的门控输出可以通过将色散延迟线的输出施加到设置到检测到的中心频率的窄带滤波器而无需依赖于码相关。 窄带干扰信号由连续梳状滤波器，滤波器输出的硬限幅器和求和装置拒绝。 相同的窄带信号抑制可以通过硬限制压缩接收机延迟线的输出，然后用具有与压缩接收机延迟线的分散特性相反的色散特性的附加色散延迟线返回到时域来实现。 可以通过将输入信号提高到第四功率来抵消伪随机正交相移。
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公开(公告)号：US5343207A
公开(公告)日：1994-08-30
申请号：US913436
申请日：1986-09-30
IPC分类号： G01S7/02 , H04B1/12 , G01S7/40 , G01R23/175
摘要： The input ports (18) of an imaging compressive receiver (20) receive from a tapped delay line (16) progressively delayed versions of a received signal s(t). Because of the delays, a signal component in the received signal appears at least at one of the input ports (18) of the compressive receiver (20) at a time when the compressive receiver (20) will detect it, even if the undelayed version occurs during a time at which the compressive receiver (20) would ordinarily be insensitive to it. Since the compressive receiver (20) is an imaging device, it provides relatively isolated channels between its input terminals (18) and its output terminals (38). The phase relationships between the delays in these channels remain constant despite changes in environmental factors, however, because the various channels are embodied in a common two-dimensional delay line.
摘要翻译： 成像压缩接收器（20）的输入端口（18）从抽头延迟线（16）接收逐渐延迟的接收信号s（t）的版本。 由于延迟，接收信号中的信号分量至少在压缩接收器（20）的输入端口（18）中的一个出现时，即使压缩接收器（20）将检测到该信号分量，即使未延迟版本 在压缩接收器（20）通常对其不敏感的时间期间发生。 由于压缩接收器（20）是成像装置，所以它在其输入端子（18）和其输出端子（38）之间提供相对隔离的通道。 尽管环境因素发生变化，但这些信道的延迟之间的相位关系保持不变，但是由于各种信道被体现在通用的二维延迟线中。
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公开(公告)号：US4654667A
公开(公告)日：1987-03-31
申请号：US685175
申请日：1984-12-21
CPC分类号： G01S3/16
摘要： A signal-acquisition system (10) for a circular antenna array (12) includes a two-dimensional compressive receiver (18) that performs a two-dimensional Fourier transformation in time and position on the outputs of the array. Each of the outputs of the compressive receiver (18) is fed to input ports of several processing units (24), which multiply them by an appropriate time-dependent function. The resultant modified signals are then processed by Butler matrices (30) that together have a matrix of output ports (32). Each output port is associated with a different combination of azimuth and elevation angles. A signal source at given azimuth and elevation angles with respect to the array (12) causes its greatest response in the output port (32) associated with those angles.
摘要翻译： 一种用于圆形天线阵列（12）的信号采集系统（10）包括二维压缩接收器（18），其在阵列的输出上在时间和位置上执行二维傅里叶变换。 压缩接收器（18）的每个输出被馈送到若干处理单元（24）的输入端口，该处理单元将它们乘以适当的时间相关函数。 所得到的经修改的信号然后由Butler矩阵（30）处理，它们一起具有输出端口（32）的矩阵。 每个输出端口与方位角和仰角的不同组合相关联。 在相对于阵列（12）的给定方位和仰角处的信号源在与这些角度相关联的输出端口（32）中产生最大的响应。
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