-
公开(公告)号：US5087917A
公开(公告)日：1992-02-11
申请号：US584157
申请日：1990-09-18
摘要： 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.
摘要翻译： 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。
-
公开(公告)号：US5323162A
公开(公告)日：1994-06-21
申请号：US125589
申请日：1993-09-23
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。
-
3.发明授权Stabilizing method of synthetic aperture radar and position determining method thereof 失效合成孔径雷达的稳定方法及其位置确定方法
公开(公告)号：US5495248A
公开(公告)日：1996-02-27
申请号：US153675
申请日：1993-11-16
申请人： Masatoshi Kawase , Seiichi Maeda , Takahiko Fujisaka , Yoshimasa Oh-Hashi , Michimasa Kondo , Natsuki Kondo
发明人： Masatoshi Kawase , Seiichi Maeda , Takahiko Fujisaka , Yoshimasa Oh-Hashi , Michimasa Kondo , Natsuki Kondo
CPC分类号： G01S13/876 , G01S13/90 , G01S13/74 , G01S13/9035
摘要： 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.
摘要翻译： 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。
-
公开(公告)号：US4656479A
公开(公告)日：1987-04-07
申请号：US690938
申请日：1985-01-14
摘要： 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.
摘要翻译： 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。
-
公开(公告)号：US4989008A
公开(公告)日：1991-01-29
申请号：US472342
申请日：1990-01-30
CPC分类号： G01S13/9035 , G01S2013/9052
摘要： The receiving apparatus of a spotlight mapping radar system is provided with a digital beamforming antenna capable of converting the echo signals received by a plurality of antenna elements into corresponding digital signals and processing them by DFT and forming a plurality of reception beams oriented in different directions at the same time to enhance the cross-range resolution without reducing the distance measurement capability and the measurable range. Pulse compressors, azimuth compressors, display buffers and reference signal generators are provided respectively for each of the outputs of the digital beamforming antenna for outputting the plurality of reception beams. An output picture synthesizing apparatus synthesizes signals representing the picture information from the respective display buffers and outputs the synthesized signals to a display to display thereon the synthesized picture of an object to be observed.
摘要翻译： 聚光灯映射雷达系统的接收装置设置有数字波束形成天线，能够将由多个天线元件接收的回波信号转换成相应的数字信号，并通过DFT进行处理，并形成多个不同方向的接收波束 同时在不减少距离测量能力和可测量范围的情况下增强跨距分辨率。 分别为数字波束形成天线的每个输出提供脉冲压缩机，方位压缩机，显示缓冲器和参考信号发生器，用于输出多个接收波束。 输出图像合成装置从各个显示缓冲器合成表示图像信息的信号，并将合成信号输出到显示器，以在其上显示待观察对象的合成图像。
-
公开(公告)号：US5191347A
公开(公告)日：1993-03-02
申请号：US751126
申请日：1991-08-28
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。
-
公开(公告)号：US5059966A
公开(公告)日：1991-10-22
申请号：US477346
申请日：1990-02-08
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。
-
公开(公告)号：US4996532A
公开(公告)日：1991-02-26
申请号：US450290
申请日：1989-12-13
摘要： A radar system having improved interference resistance. A transmitting section includes an oscillator capable of switching the oscillation frequency, and a transmitting antenna connected to said oscillator and capable of transmitting electric waves having specified transmitting frequencies transmitted in different directions in a specified order to enable a desired range to be scanned. The oscillator and the transmitting antenna are designed to operate so that every time one scanning is completed or every time the transmitting direction is changed during each scanning period, the transmitting frequency may be changed. The receiver can simultaneously form a plurality of beams in the scanning range, convert the received signals to digital signals, and output signals indicating the frequencies and arrival directions of the received signals. The operating mode of the transmitting section may be altered in accordance with the frequency and arrival direction of the received waves.
摘要翻译： 具有改善的抗干扰性的雷达系统。 发送部分包括能够切换振荡频率的振荡器和连接到所述振荡器的发送天线，并且能够以指定的顺序发送具有以不同方向发送的指定发送频率的电波，以使能够扫描期望的范围。 振荡器和发射天线被设计成使得每次扫描完成或每次扫描周期期间每次发射方向改变时，可以改变发射频率。 接收机可以同时在扫描范围内形成多个光束，将接收的信号转换为数字信号，并输出指示接收信号的频率和到达方向的信号。 可以根据接收到的波的频率和到达方向改变发送部分的操作模式。
-
公开(公告)号：US5457462A
公开(公告)日：1995-10-10
申请号：US279941
申请日：1994-07-25
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。
-
公开(公告)号：US4947176A
公开(公告)日：1990-08-07
申请号：US363490
申请日：1989-06-08
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。
-
-
-
-
-
-
-
-
-
搜索结果
20 条记录 (耗时 0.02 秒)
