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    • 2. 发明授权
    • Radar system
    • 雷达系统
    • US4656479A
    • 1987-04-07
    • US690938
    • 1985-01-14
    • Tetsuo KirimotoMichimasa KondoTakahiko Fujisaka
    • Tetsuo KirimotoMichimasa KondoTakahiko Fujisaka
    • G01S7/292G01S13/42G01S13/53G01S13/76
    • G01S13/42G01S13/76
    • A radar system for finding the location of a second flying object from a first flying object, comprises a nondirectional antenna for radiating a first radio wave from the first flying object, a second nondirectional antenna provided on the second flying object to receive the first radio wave and to radiate a second radio wave generated by modulating the received first radio wave and an array antenna provided on the first flying object to receive the second radio wave. The respective amplitudes of the signals given by the antenna elements of the array antenna are compared individually with a specified level and an operation for determining the direction of arrival of the second radio wave is executed using the signals given by all the antenna elements when either of the amplitudes of the signals given by the antenna elements is greater than the specified level.
    • 用于从第一飞行物体找到第二飞行物体的位置的雷达系统包括用于辐射来自第一飞行物体的第一无线电波的非定向天线,设置在第二飞行物体上的第二无方位天线,以接收第一无线电波 并辐射通过调制所接收的第一无线电波产生的第二无线电波和设置在第一飞行物体上的阵列天线以接收第二无线电波。 由阵列天线的天线元件给出的信号的相应幅度被单独地与指定电平进行比较,并且使用由所有天线元件给出的信号来执行用于确定第二无线电波的到达方向的操作, 由天线元件给出的信号的振幅大于指定的电平。
    • 4. 发明授权
    • Synthetic aperture radar system
    • 合成孔径雷达系统
    • US5323162A
    • 1994-06-21
    • US125589
    • 1993-09-23
    • Takahiko FujisakaYoshimasa Oh-HashiMichimasa Kondo
    • Takahiko FujisakaYoshimasa Oh-HashiMichimasa Kondo
    • G01S13/28G01S13/50G01S13/90
    • G01S13/9029G01S13/28
    • 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.
    • 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。
    • 5. 发明授权
    • Tracking radar system
    • 跟踪雷达系统
    • US4472718A
    • 1984-09-18
    • US308171
    • 1981-10-02
    • Yoshimasa OhashiTetsuo KirimotoMichimasa Kondo
    • Yoshimasa OhashiTetsuo KirimotoMichimasa Kondo
    • G01S13/42G01S7/44
    • G01S13/42
    • A tracking radar system which includes a variable frequency oscillator for supplying to a vertical antenna array an oscillation frequency which is changed for each of a number of pulses transmitted from the antenna array. The antenna array transmits an electric wave toward a target at a low altitude and receives an echo from the target. An electronic computer estimates an elevation angle of the target from the echo received by the antenna array according to array aperture sampling technique for each pulse. An averaging circuit averages those estimated elevation angles of the target to provide its elevation angle. Alternatively, the oscillation frequency may change for each of finite time intervals.
    • 一种跟踪雷达系统,其包括可变频率振荡器,用于向垂直天线阵列提供对从天线阵列发送的多个脉冲中的每一个发生改变的振荡频率。 天线阵列向低空的目标发射电波并从目标接收回波。 电子计算机根据每个脉冲的阵列孔径采样技术估计由天线阵列接收的回波的目标的仰角。 平均电路平均目标的估计仰角以提供其仰角。 或者,振荡频率可以针对每个有限时间间隔而改变。
    • 7. 发明授权
    • Radar signal processor and pulse doppler radar system therewith
    • 雷达信号处理器和脉冲多普勒雷达系统
    • US5457462A
    • 1995-10-10
    • US279941
    • 1994-07-25
    • Masashi MitsumotoTakahiko SugimotoTakahiko FujisakaMichimasa Kondo
    • Masashi MitsumotoTakahiko SugimotoTakahiko FujisakaMichimasa Kondo
    • G01S7/292G01S7/32G01S13/524G01S7/288
    • G01S13/5246G01S7/2926
    • 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.
    • 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。
    • 9. 发明授权
    • Stabilizing method of synthetic aperture radar and position determining
method thereof
    • 合成孔径雷达的稳定方法及其位置确定方法
    • US5495248A
    • 1996-02-27
    • US153675
    • 1993-11-16
    • Masatoshi KawaseSeiichi MaedaTakahiko FujisakaYoshimasa Oh-HashiMichimasa KondoNatsuki Kondo
    • Masatoshi KawaseSeiichi MaedaTakahiko FujisakaYoshimasa Oh-HashiMichimasa KondoNatsuki Kondo
    • G01S13/74G01S13/87G01S13/90
    • G01S13/876G01S13/90G01S13/74G01S13/9035
    • A stabilizing method of a synthetic aperture radar and a position determining method by the radar. At least three repeaters are arranged in mutually different positions on the ground or the sea and a radio frequency signal having a predetermined frequency is transmitted from the radar mounted on a radar platform such as an aircraft to the repeaters. Each repeater frequency-modulates and amplifies the received signal to return the signal to the radar. The radar receives the signal returned from each repeater. The radar calculates a distance between the radar platform and each repeater on the basis of a time required for the transmitting and the receiving and phase information of the received signal. When the position of each repeater is known, by using the positions of the repeaters and the calculated distances, the position of the radar platform can be calculated. On the basis of the obtained position of the radar platform, a reference signal for phase compensation is generated. The radar eliminates a phase variation of a reflected wave received from an object to be acquired by multiplying the reflected wave by the reference signal for phase compensation.
    • 一种合成孔径雷达的稳定方法和雷达的位置确定方法。 至少三个中继器布置在地面或大海上相互不同的位置,并且具有预定频率的射频信号从安装在诸如飞行器的雷达平台上的雷达发射到中继器。 每个中继器对接收的信号进行频率调制和放大,以将信号返回到雷达。 雷达接收从每个中继器返回的信号。 雷达根据接收信号的发送和接收所需的时间和相位信息,计算雷达平台与每个中继器之间的距离。 当每个中继器的位置已知时,通过使用中继器的位置和计算的距离,可以计算雷达平台的位置。 在获得的雷达平台位置的基础上,生成相位补偿的参考信号。 雷达通过将反射波乘以基准信号进行相位补偿,消除了从要获取的物体接收的反射波的相位变化。
    • 10. 发明授权
    • Radar system
    • 雷达系统
    • US5087917A
    • 1992-02-11
    • US584157
    • 1990-09-18
    • Takahiko FujisakaTetsuo KirimotoYoshimasa Oh-hashiMichimasa Kondo
    • Takahiko FujisakaTetsuo KirimotoYoshimasa Oh-hashiMichimasa Kondo
    • G01S13/48H01Q3/26H01Q3/38
    • G01S13/48H01Q3/26H01Q3/385
    • A radar system having a phased array antenna for transmission and a digital beam forming antenna for reception for observing a plurality of targets by transmitting transmission pulses to the respective targets comprises a subtraction control circuit, a transmission timing control circuit and a transmission beam direction control circuit. The substraction control circuit calculates a required number of transmission pulses (beams) to be transmitted for each of transmission cycles in accordance with detected Doppler frequencies of the targets, so as not to cause ambiguity on the detected Doppler frequencies, and determines a beam direction for each of transmission beams. The timing control circuit and beam direction control circuit control transmission timing and direction of the beams.
    • 具有用于传输的相控阵天线的雷达系统和用于通过向各个目标发送传输脉冲来观察多个目标的用于接收的数字波束形成天线包括减法控制电路,发送定时控制电路和发送波束方向控制电路 。 减法控制电路根据检测到的目标多普勒频率,计算要发送的每个发送周期的发送脉冲(波束)的数量,以便不会对检测到的多普勒频率造成歧义,并且确定波束方向 每个传输光束。 定时控制电路和光束方向控制电路控制光束的传输定时和方向。