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1. 发明授权

US5323162A Synthetic aperture radar system 失效
标题翻译：合成孔径雷达系统
公开(公告)号：US5323162A
公开(公告)日：1994-06-21
申请号：US125589
申请日：1993-09-23
申请人： Takahiko Fujisaka , Yoshimasa Oh-Hashi , Michimasa Kondo
发明人： Takahiko Fujisaka , Yoshimasa Oh-Hashi , Michimasa Kondo
IPC分类号： G01S13/28 , G01S13/50 , G01S13/90
CPC分类号： G01S13/9029 , G01S13/28
摘要： A synthetic aperture radar system is mounted in a moving platform. The synthetic aperture radar system includes a multi-beam antenna having a plurality of reception beams different in direction from one another, the multi-beam antenna being adapted to receive radar echoes from objects. The width of each of the reception beams is selected such that the band width of a Doppler shift contained in the radar echo of a moving object is broader than that of a Doppler shift contained in the radar echo of a stationary object. The radar echo is pulse compressed to improve the range resolution before the frequency thereof is shifted such that the center frequency of the Doppler shift due to the velocity of the moving platform becomes zero. After the frequency shifting, the radar echo is filtered to separate the radar echoes of the moving and stationary objects from each other. The radar echoes of the moving and stationary objects are respectively subjected to Fourier transform with respect to the distance between the moving platform and the objects. The spectrum of the radar echo from the moving object is further shifted such that the center frequency of the Doppler shift due to the velocity of the object becomes zero. These reception, pulse compression, frequency shift and Fourier transform are executed for each reception beam. The spectrums in the radar echoes of the moving and stationary objects are respectively synthesized for all the reception beams. After the synthesization, the spectrums are respectively multiplied by a reference spectrum in the complex manner. The results of the multiplication are respectively inverse transformed from the spectrums.
摘要翻译：合成孔径雷达系统安装在移动平台上。合成孔径雷达系统包括具有彼此不同的多个接收波束的多波束天线，多波束天线适于从物体接收雷达回波。选择每个接收光束的宽度，使得包含在移动物体的雷达回波中的多普勒频移的带宽比包含在静止物体的雷达回波中的多普勒频移宽。雷达回波被脉冲压缩，以在频率偏移之前提高范围分辨率，使得由于移动平台的速度而导致的多普勒频移的中心频率变为零。频移后，对雷达回波进行滤波，将运动和静止物体的雷达回波相互分离。运动和静止物体的雷达回波分别相对于移动平台和物体之间的距离进行傅里叶变换。来自运动物体的雷达回波的频谱被进一步移位，使得由于对象的速度引起的多普勒频移的中心频率变为零。对每个接收波束执行这些接收，脉冲压缩，频移和傅里叶变换。移动和静止物体的雷达回波中的频谱分别为所有接收波束合成。在合成之后，将光谱分别以复杂的方式乘以参考光谱。乘法的结果分别从频谱中逆变换。

2. 发明授权

US5097269A Multistatic radar systems 失效
标题翻译：多重雷达系统
公开(公告)号：US5097269A
公开(公告)日：1992-03-17
申请号：US647167
申请日：1991-01-24
申请人： Naohisa Takayama , Takahiko Fujisaka , Yoshimasa Ohashi
发明人： Naohisa Takayama , Takahiko Fujisaka , Yoshimasa Ohashi
IPC分类号： G01S13/46 , G01S13/00
CPC分类号： G01S13/003
摘要： A multistatic radar system is provided in which a transmitter radiating high-frequency radio waves is mounted on a flying object adapted to be launched into the sky, whereby the range of the radar system is improved.
摘要翻译：提供了一种多基地雷达系统，其中将辐射高频无线电波的发射器安装在适于发射到天空中的飞行物体上，从而提高了雷达系统的范围。

3. 发明授权

US06611225B2 Radar signal processing apparatus, and method of measuring distance and speed 失效
公开(公告)号：US06611225B2
公开(公告)日：2003-08-26
申请号：US10137280
申请日：2002-05-03
申请人： Masashi Mitsumoto , Takahiko Fujisaka , Koichi Kai
发明人： Masashi Mitsumoto , Takahiko Fujisaka , Koichi Kai
IPC分类号： G01S1393
CPC分类号： G01S13/345 , G01S7/354 , G01S13/931 , G01S2007/356
摘要： A radar signal processing apparatus has a range gate for extracting range gate data sequences from a memory, a first frequency extraction section which extracts a beat frequency corresponding to a target by performing frequency analysis by FFT at a low computation load and with low frequency measurement accuracy on all range gate data sequences extracted by the range gate, a second frequency extraction section which extracts a beat frequency corresponding to the target by performing frequency analysis by FFT at a high computation load and with high frequency measurement accuracy only on the range gate data sequence from which a beat frequency has been extracted by the first frequency extraction section, and a distance and speed derivation section which obtains the relative distance and the relative speed of the target on the basis of the beat frequency extracted by the second frequency extraction section.

4. 发明授权

US06335701B1 Radar system and coherent integrating method thereof 失效
标题翻译：雷达系统及其相干积分法
公开(公告)号：US06335701B1
公开(公告)日：2002-01-01
申请号：US09649842
申请日：2000-08-28
申请人： Takahiko Fujisaka , Kimio Asaka , Yoshihito Hirano , Shusou Wadaka
发明人： Takahiko Fujisaka , Kimio Asaka , Yoshihito Hirano , Shusou Wadaka
IPC分类号： G01S1353
CPC分类号： G01S7/288 , G01S13/532
摘要： Disclosed is a radar system capable of obviating a problem that a sufficient improvement of an S/N ratio could not be obtained in the prior art, and comprising a transmitter/receiver for detecting a phase of a receiving signal reflected from an observation target, an A/D converter for converting the receiving signal into a digital signal, a range gate for extracting the receiving signal having a time corresponding to the predetermined pulse width, a data dividing unit for dividing the receiving signals in to two groups of data, an FFT unit for fast-Fourier-transforming one group of data of the two groups of data, an FFT unit for fast-Fourier-transforming the other group of data, a complex conjugating unit for taking a complex conjugate of an output of the FFT unit, a complex multiplying unit for performing a complex multiplication for the every same Doppler frequency component with respect to an output of the former FFT unit and an output of the complex conjugating unit, and a complex adder for executing a coherent addition of a result of the complex multiplication the same number of times as the repetitions with respect to the same Doppler frequency component. The receiving signals can be coherently integrated both in the pulse and between the pulses, and the S/N ratio can be improved.
摘要翻译：公开了一种能够消除在现有技术中无法获得S / N比的充分改善的问题的雷达系统，并且包括用于检测从观测目标反射的接收信号的相位的发射机/接收机，用于将接收信号转换为数字信号的A / D转换器，用于提取具有与预定脉冲宽度相对应的时间的接收信号的量程门，用于将接收信号分成两组数据的数据分割单元，FFT 用于对两组数据的一组数据进行快速傅立叶变换的单元，用于对另一组数据进行快速傅立叶变换的FFT单元，用于获取FFT单元的输出的复共轭的复共轭单元，复数乘法单元，用于相对于前一FFT单元的输出和复共轭单元的输出执行针对每个相同的多普勒频率分量的复乘法，以及复共轭加法器，用于执行复数乘法结果的相干相加相同于相同多普勒频率分量的重复次数。接收信号可以在脉冲和脉冲之间相干地集成，并且可以提高S / N比。

5. 发明授权

US5287430A Signal discrimination device using neural network 失效
标题翻译：信号辨识装置使用神经网络
公开(公告)号：US5287430A
公开(公告)日：1994-02-15
申请号：US868460
申请日：1992-04-14
申请人： Masafumi Iwamoto , Takamitsu Okada , Takahiko Fujisaka , Michimasa Kondoh
发明人： Masafumi Iwamoto , Takamitsu Okada , Takahiko Fujisaka , Michimasa Kondoh
IPC分类号： G06F15/18 , G01S7/32 , G01S7/41 , G01S13/04 , G06G7/60 , G06K9/66 , G06N3/00 , G06N99/00 , H03M1/00
CPC分类号： G01S7/417 , G06K9/66
摘要： A signal discrimination device using a neural network for discriminating input signals such as radar reception signals includes an adaptive code generator means for generating codes for representing the discrimination categories. The distances between the codes for closely related categories are smaller than the distances between the codes for remotely related categories. During the learning stage, the neural network is trained to output the codes for respective inputs. The discrimination result judgment means determines the categories by comparing the outputs of the neural network and the codes for the respective categories.
摘要翻译：使用用于识别诸如雷达接收信号之类的输入信号的神经网络的信号识别装置包括用于生成用于表示鉴别类别的代码的自适应码发生器装置。密切相关类别的代码之间的距离小于远程相关类别的代码之间的距离。在学习阶段，训练神经网络输出各个输入的代码。鉴别结果判断装置通过比较神经网络的输出和各个类别的代码来确定类别。

6. 发明授权

US5132688A Pulsed doppler radar system having an improved detection probability 失效
标题翻译：具有改进的检测概率的脉冲多普勒雷达系统
公开(公告)号：US5132688A
公开(公告)日：1992-07-21
申请号：US661656
申请日：1991-02-27
申请人： Akihiro Shima , Takahiko Fujisaka , Yoshimasa Ohashi
发明人： Akihiro Shima , Takahiko Fujisaka , Yoshimasa Ohashi
IPC分类号： G01S7/292 , G01S13/532
CPC分类号： G01S13/532
摘要： A pulsed doppler radar system having an improved detection probability, comprising an antenna unit, a transmitter for transmitting a signal through the antenna unit, a receiver for receiving a signal reflected by a target through the antenna unit to provide a reception signal. A processing unit which receives the reception signal from the receiver determines, in accordance with a range of the target and a signal-to-noise ratio and bandwidth of the reception signal, an optimum integration number which maximizes the detection probability and performs coherent integration on the reception signal by the number of times equal to the determined optimum integration number thereby outputting a signal having a predetermined level. Such a signal is fed to a display and an image of the target is displayed on a display.
摘要翻译：具有改进的检测概率的脉冲多普勒雷达系统，包括天线单元，用于通过天线单元发送信号的发射机，用于通过天线单元接收由目标反射的信号以提供接收信号的接收机。从接收器接收接收信号的处理单元根据目标的范围和接收信号的信噪比和带宽来确定使检测概率最大化并执行相干积分的最佳积分数接收信号的次数等于所确定的最佳积分数，从而输出具有预定电平的信号。这样的信号被馈送到显示器，并且目标的图像被显示在显示器上。

7. 发明授权

US5457462A Radar signal processor and pulse doppler radar system therewith 失效
标题翻译：雷达信号处理器和脉冲多普勒雷达系统
公开(公告)号：US5457462A
公开(公告)日：1995-10-10
申请号：US279941
申请日：1994-07-25
申请人： Masashi Mitsumoto , Takahiko Sugimoto , Takahiko Fujisaka , Michimasa Kondo
发明人： Masashi Mitsumoto , Takahiko Sugimoto , Takahiko Fujisaka , Michimasa Kondo
IPC分类号： G01S7/292 , G01S7/32 , G01S13/524 , G01S7/288
CPC分类号： G01S13/5246 , G01S7/2926
摘要： A radar signal processor for use in a pulse radar system. Reception signals are given from a range divide and output circuit to a plurality of integration point variable coherent integrators, each of which is allocated to a different range domain. The range domain is given to an integration point setting section provided corresponding to each integration point variable coherent integrator. The integration point setting section determines the number of coherent integration points based on the given range domain and sets it in the corresponding integration point variable coherent integrator. The signal resulting from coherent integration by the integration point variable coherent integrator is discriminated to frequencies, then supplied to any square detector for square detection for each frequency component. Square detection output is fed into a CFAR detector, which then makes its false alarm rate constant for a supply to a display, etc.
摘要翻译：用于脉冲雷达系统的雷达信号处理器。接收信号从范围分频和输出电路被给予多个积分点可变相干积分器，每个积分点被分配给不同的范围域。范围域被赋予与每个积分点可变相干积分器对应的集成点设置部分。积分点设置部分基于给定的范围域确定相干积分点的数量，并将其设置在相应的积分点可变相干积分器中。由积分点可变相干积分器的相干积分产生的信号被鉴别为频率，然后提供给任何平方检波器，用于每个频率分量的平方检测。方波检测输出送入CFAR检测器，然后使其误报率保持恒定，供给显示器等。

8. 发明授权

US5191347A Pulsed Doppler radar system 失效
标题翻译：脉冲多普勒雷达系统
公开(公告)号：US5191347A
公开(公告)日：1993-03-02
申请号：US751126
申请日：1991-08-28
申请人： Sachiko Ishikawa , Takahiko Fujisaka , Yoshimasa Oh-hashi
发明人： Sachiko Ishikawa , Takahiko Fujisaka , Yoshimasa Oh-hashi
IPC分类号： G01S13/28 , G01S13/58
CPC分类号： G01S13/582 , G01S13/282
摘要： A pulsed Doppler radar system comprises a transmitter for generating and transmitting a pulse signal having expanded frequency bandwidth, an antenna apparatus for sending the output of the transmitter to a target and for receiving a signal which was sent by the transmitter and reflected by the target, a receiver for processing the received signal to obtain a complex video signal, a pulse compressing circuit including a pulse Doppler processor responsive to the complex video signal for detecting a relative speed of the target and a storage device for storing a reference signal which includes a compensation factor by which an influence of the Doppler effect is compensated in accordance with the speed of the target. The pulse compressing circuit is operative to correlate the output of the pulse Doppler processor with the reference signal so as to convert the complex video signal to a signal having a narrow pulse width, a detector for performing envelope detection on the narrow pulse width signal, and a display responsive to the output of the detector for displaying a detected target thereon.
摘要翻译：脉冲多普勒雷达系统包括用于产生和发送具有扩展的频率带宽的脉冲信号的发射机，用于将发射机的输出发送到目标并用于接收由发射机发送并由目标反射的信号的天线装置，用于处理接收信号以获得复视频信号的接收机，包括响应于用于检测目标的相对速度的复视频信号的脉冲多普勒处理器的脉冲压缩电路和用于存储参考信号的存储装置，该参考信号包括补偿根据目标的速度来补偿多普勒效应的影响的因素。脉冲压缩电路用于使脉冲多普勒处理器的输出与参考信号相关，以将复视频信号转换成具有窄脉冲宽度的信号，用于对窄脉冲宽度信号进行包络检测的检测器，以及响应于检测器的输出显示其上检测到的目标的显示器。

9. 发明授权

US5059966A Synthetic aperture radar system 失效
标题翻译：合成孔径雷达系统
公开(公告)号：US5059966A
公开(公告)日：1991-10-22
申请号：US477346
申请日：1990-02-08
申请人： Takahiko Fujisaka , Yoshimasa Oh-Hashi
发明人： Takahiko Fujisaka , Yoshimasa Oh-Hashi
IPC分类号： G01S7/02 , G01S13/87 , G01S13/90
CPC分类号： G01S13/87 , G01S13/90
摘要： A synthetic aperture radar system wherein a plurality of beams is formed for receiving echo signals and the spectra of the received signals are synthesized in an azimuth compression unit to improve the cross-range resolution.
摘要翻译：一种合成孔径雷达系统，其中形成多个波束用于接收回波信号，并且接收信号的频谱在方位压缩单元中合成以提高交叉范围分辨率。

10. 发明授权

US4947176A Multiple-beam antenna system 失效
标题翻译：多波束天线系统
公开(公告)号：US4947176A
公开(公告)日：1990-08-07
申请号：US363490
申请日：1989-06-08
申请人： Shigeho Inatsune , Yoshimasa Ohashi , Takahiko Fujisaka , Michimasa Kondo
发明人： Shigeho Inatsune , Yoshimasa Ohashi , Takahiko Fujisaka , Michimasa Kondo
IPC分类号： G01S3/74 , G01S13/48 , H01Q21/00 , H01Q25/00
CPC分类号： G01S3/74 , G01S13/48 , H01Q21/0025 , H01Q25/00
摘要： A multiple-beam antenna system capable of forming a plurality of beams at one time in different directions. The antenna system has a plurality of element antennas arranged in a predetermined configuration. A signal received by each element antenna is converted to a digital signal which in turn is subjected to a Fourier transform. The Fourier-transformed receiving signal is multiplied with a Fourier-transformed weighting function. The resultant product is subjected to an inverse Fourier transform to be used for calculating an antenna radiation pattern. A holographic multiple-beam antenna is also disclosed.
摘要翻译：能够在不同方向一次形成多个光束的多光束天线系统。天线系统具有以预定配置布置的多个元件天线。由每个元件天线接收的信号被转换成数字信号，数字信号又进行傅立叶变换。傅立叶变换接收信号与傅里叶变换加权函数相乘。对所得产物进行逆傅里叶变换，以用于计算天线辐射图。还公开了全息多波束天线。

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