公开(公告)号：US4672638A

公开(公告)日：1987-06-09

申请号：US663710

申请日：1984-10-22

申请人： Tetsu Taguchi ,  Tatsukichi Koshio

发明人： Tetsu Taguchi ,  Tatsukichi Koshio

IPC分类号： G01S7/292 ,  G01S7/32 ,  G01S13/78 ,  H04B1/10

CPC分类号： G01S7/32 ,  G01S13/787 ,  G01S7/292

摘要： For use in cancelling a distortion caused by multipath transmission to an original radio frequency pulse of an original pulse shape, a multipath canceller comprises a priliminary circuit for producing a distortionless pulse of the original pulse shape and a distortion cancelling circuit responsive to the distortionless pulse and each distorted pulse having the distortion for producing a distortion cancelled pulse at a correct pulse position which the original pulse would have if received through a direct path alone. The preliminary circuit may comprise a memory for the distortionless pulse. The distortion cancelling circuit may comprise an envelope detector for envelope detecting the distorted pulse to produce a detected pulse, a composer for composing the distortionless pulse with different amplitudes and pulse positions repeatedly into a composite pulse approximating the detected pulse, and a generator for generating the distortion cancelled pulse by using the distortionless pulse and a pulse position of one of the composite pulses that has an earliest occurrence. Alternatively, the preliminary circuit may comprise DFT and IDFT circuits for processing the distorted pulse into the distortionless pulse. The distortion cancelling circuit may comprise a cross-correlator for the distorted and the distortionless pulses and an autocorrelator for the distortionless pulse.

摘要翻译： 为了用于消除由原始脉冲形状的原始射频脉冲引起的失真，多路径消除器包括用于产生原始脉冲形状的无失真脉冲的辅助电路和响应于无失真脉冲的失真消除电路，以及 每个失真脉冲具有用于在正确的脉冲位置产生失真抵消脉冲的失真，原始脉冲将通过单独的直接路径接收。 初步电路可以包括用于无失真脉冲的存储器。 失真消除电路可以包括用于包络检测失真脉冲以产生检测到的脉冲的包络检测器，用于将具有不同幅度和脉冲位置的无失真脉冲重复组合成接近检测到的脉冲的复合脉冲的作曲者，以及用于产生检测到的脉冲的发生器 通过使用无失真脉冲和具有最早发生的复合脉冲之一的脉冲位置的失真消除脉冲。 或者，初步电路可以包括用于将失真脉冲处理成无失真脉冲的DFT和IDFT电路。 失真消除电路可以包括用于失真和无失真脉冲的互相关器，以及用于无失真脉冲的自相关器。

公开(公告)号：US4455556A

公开(公告)日：1984-06-19

申请号：US262860

申请日：1981-05-12

申请人： Tatsukichi Koshio ,  Osamu Okamoto

发明人： Tatsukichi Koshio ,  Osamu Okamoto

IPC分类号： G01S13/78 ,  G01S13/76 ,  G01S7/28

CPC分类号： G01S13/788

摘要： In a distance measuring equipment for measuring the distance between an interrogator and a transponder with high precision by detecting the time from transmission of an interrogation pulse from the interrogator to reception of a reply pulse transmitted from the transponder on the basis of timing positions of said respective pulses; as leading edges of the interrogation pulse and reply pulse, a waveform represented by the formula of: ##EQU1## where E and F represent finite positive values and T represents time, is used, or else as a leading edge of the interrogation pulse, a waveform which can be approximated by the above formula is used, while as a leading edge of the reply pulse, a waveform obtained by passing a waveform approximately expressed by the formula of: ##EQU2## through a low-pass filter having a predetermined cut-off frequency, is used.

摘要翻译： 在距离测量设备中，通过检测从询问器传送询问脉冲到接收从应答器发送的应答脉冲的时间，基于所述相应的定时位置来测量询问器和应答器之间的距离， 脉冲 作为询问脉冲和应答脉冲的前沿，由以下公式表示的波形：其中E和F表示有限正值，T表示时间，或者作为前导边 使用询问脉冲，可以使用上述公式近似的波形，而作为应答脉冲的前沿，通过将由以下公式近似表示的波形传递得到的波形： + TR 通过 使用具有预定截止频率的低通滤波器。