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66 条记录 (耗时 0.017 秒)

    Data quality and ambiguity resolution in a doppler radar system
    1.
    发明授权
    Data quality and ambiguity resolution in a doppler radar system 失效
    多普勒雷达系统中的数据质量和模糊度分辨率

    公开(公告)号：US5247303A

    公开(公告)日：1993-09-21

    申请号：US916941

    申请日：1992-07-20

    申请人： Richard H. Cornelius ,  Richard W. Gagnon ,  Jules F. Pratte

    发明人： Richard H. Cornelius ,  Richard W. Gagnon ,  Jules F. Pratte

    IPC分类号： G01S13/20 ,  G01S13/528 ,  G01S13/95

    CPC分类号： G01S13/951 ,  G01S13/20 ,  G01S13/528 ,  Y10S706/902

    摘要： The pulsed Doppler weather radar system reduces ambiguities in measured parameters by staggering at least one pulse of each frame of n pulses transmitted by the radar system. The staggered pulse creates an isolated pulse doublet pair to provide three or more independent and auxiliary Doppler parameter estimates. The parameter estimates are combined optimally in a neuromorphic processor matched to the phenomena of interest, particularly capitalizing on multiparameter volumetric correlations to improve data quality.

    摘要翻译： 脉冲多普勒天气雷达系统通过交错雷达系统传输的n个脉冲的每帧的至少一个脉冲来减少测量参数中的歧义。 交错脉冲产生一个隔离的脉冲双对，以提供三个或更多的独立和辅助多普勒参数估计。 参数估计结合最佳的神经形态处理器与感兴趣的现象相匹配，特别是利用多参数体积相关性来提高数据质量。

    Second time around clutter cancellation system
    2.
    发明授权
    Second time around clutter cancellation system 失效
    第二次杂乱取消系统

    公开(公告)号：US4890113A

    公开(公告)日：1989-12-26

    申请号：US130706

    申请日：1987-12-09

    申请人： Omar J. Jacomini

    发明人： Omar J. Jacomini

    IPC分类号： G01S13/528 ,  G01S13/532

    CPC分类号： G01S13/528 ,  G01S13/532

    摘要： The present invention provides a system that cancels second time around clutter in a multiple pulse repetition frequency radar system which uses three groups of differently spaced pulses. The system processes returns from a clutter cancellation group of eight pulses from three different concatenated pulse repetition frequency groups, using two pulses from one group, all pulses from a central group and two pulses from a third group. The pulse returns are each multiplied by a different weight and the eight weighted returns are added together and output as the filtered return signal. As the weights of the outer pairs of pulses increase, as compared to the weights of the inner four pulses, the second time around clutter cancellation effects increase and the first time around clutter cancellation effects decrease.

    摘要翻译： 本发明提供一种在多脉冲重复频率雷达系统中第二次消除杂波的系统，其使用三组不同间隔的脉冲。 系统通过使用一组中的两个脉冲，来自中心组的所有脉冲和来自第三组的两个脉冲从三个不同级联脉冲重复频率组的八个脉冲的杂波消除组返回。 脉冲返回每个乘以不同的权重，八个加权返回相加在一起，并作为滤波返回信号输出。 随着外部脉冲对的权重增加，与内部四个脉冲的权重相比，杂波消除效应的第二次增加，而杂波消除效应的第一次减小。

    MTI radar system and method
    3.
    发明授权
    MTI radar system and method 失效
    MTI雷达系统及方法

    公开(公告)号：US4153899A

    公开(公告)日：1979-05-08

    申请号：US665643

    申请日：1976-03-10

    申请人： John W. Taylor, Jr.

    发明人： John W. Taylor, Jr.

    IPC分类号： G01S13/528 ,  G01S9/42

    CPC分类号： G01S13/528

    摘要： An MTI radar system having a four pulse canceller where the interpulse periods vary preferably according to a double or triple sawtooth pattern is disclosed. The four pulse canceller is comprised of a two pulse canceller cascaded with a three pulse canceller. The three pulse canceller is arranged to accomplish summations of three weighted pulses in two operations, one involving fixed binomial weights (1, -2, 1) and the other variable components (a', b', c'). The interpulse period choices and sequence of use permit the variable weights to be defined by polarity and binary fractions implemented by the use of controllable scalers and polarity reversers.

    摘要翻译： 公开了具有四脉冲消除器的MTI雷达系统，其中脉冲周期优选地根据双重或三重锯齿形式变化。 四个脉冲消除器由两个脉冲消除器组成，三个脉冲消除器级联。 三个脉冲消除器被布置成在两个操作中完成三个加权脉冲的求和，一个涉及固定二项式权重（1，-2,1）和其他可变分量（a'，b'，c'）。 脉冲间期间选择和使用顺序允许通过使用可控定标器和极性反转器实现的极性和二进制分数来定义可变权重。

    Target detection system in a medium PRF pulse doppler search/track radar receiver
    4.
    发明授权
    Target detection system in a medium PRF pulse doppler search/track radar receiver 失效
    目标检测系统在中等PRF脉冲多普勒搜索/轨道雷达接收机

    公开(公告)号：US4079376A

    公开(公告)日：1978-03-14

    申请号：US665348

    申请日：1976-03-09

    申请人： John C. Kirk, Jr.

    发明人： John C. Kirk, Jr.

    IPC分类号： G01S7/28 ,  G01S13/20 ,  G01S13/524 ,  G01S13/528 ,  G01S13/58 ,  G01S13/66 ,  G01S13/70 ,  G01S9/02 ,  G01S9/06 ,  G01S9/42

    CPC分类号： G01S13/70 ,  G01S13/20 ,  G01S13/5242 ,  G01S13/5244 ,  G01S13/528 ,  G01S13/586 ,  G01S13/66 ,  G01S7/2813

    摘要： In a medium PRF pulse doppler type radar receiver, target detection is achieved in both search and track modes. In the search mode, the video signal from the receiver section is notch filtered to cancel the main beam clutter. The remainder of the signal is threshold detected, followed by ranging each of the thresholded signals to resolve the range ambiguity of the signals. The unambiguous signals are gated through a range sensitive threshold which operates along a power curve of R.sup.4, resulting in true target returns being thresholded by the range sensitive threshold circuit and blocking out discrete sidelobe returns. In the track mode, the video signal from the receiver is clutter cancelled to remove main beam clutter, as in the search mode, and the remaining signals pass through a velocity track filter with a narrow band window. The true target return signal ranged during the search mode, is passed by the velocity track filter which is adjusted to match the true target return doppler shift during the correct range gate. The velocity track filter is controlled to track the true target return signal and is narrow enough to reject discrete sidelobe signals which occur in the same range cell. The signals passed by the velocity track filter are subsequently monitored, and guard gates are established in both adjoining range cells to insure that lock on the tracked target will not be lost due to interfering signals such as returns from moving ground targets. When the interfering signals are detected in the guard gates, the system goes on memory until the interfering signal passes.

    摘要翻译： 在PRF脉冲多普勒型雷达接收机中，在搜索和跟踪模式下实现目标检测。 在搜索模式中，来自接收器部分的视频信号被陷波滤波以取消主波束杂波。 信号的其余部分是阈值检测的，然后测量每个阈值信号以解决信号的范围模糊度。 通过沿着R4的功率曲线操作的范围敏感阈值选通无歧义信号，导致由范围敏感阈值电路阈值化的真实目标返回并阻止离散的旁瓣返回。 在轨道模式中，如在搜索模式中，来自接收机的视频信号被杂波消除以去除主波束杂波，并且剩余的信号通过具有窄带窗口的速度轨迹滤波器。 在搜索模式期间，真正的目标返回信号范围是通过速度轨道滤波器传递的，该滤波器被调整以匹配正确范围门内的真实目标返回多普勒频移。 速度轨道滤波器被控制以跟踪真实的目标返回信号，并且足够窄以抵消出现在相同范围单元中的离散旁瓣信号。 随后监测由速度轨道滤波器通过的信号，并且在相邻的距离单元中建立保护门，以确保由于诸如来自移动的地面目标的返回的干扰信号而在跟踪的目标上的锁定不会丢失。 当在保护门中检测到干扰信号时，系统进入存储器直到干扰信号通过。

    Method and means for operating an airborne switched array radar system
    5.
    发明授权
    Method and means for operating an airborne switched array radar system 失效
    运行空中开关阵列雷达系统的方法和手段

    公开(公告)号：US3858206A

    公开(公告)日：1974-12-31

    申请号：US32976573

    申请日：1973-02-05

    申请人： HUGHES AIRCRAFT CO

    发明人： SCHEIDLER S ,  KING D ,  GEBHARDT R ,  GOLDBERG G ,  SIDLO R

    IPC分类号： G01S13/10 ,  G01S13/12 ,  G01S13/524 ,  G01S13/528 ,  G01S13/66 ,  G01S13/70 ,  G01S13/87 ,  H01Q1/28 ,  H01Q25/00 ,  G01S9/02

    CPC分类号： H01Q1/28 ,  G01S13/106 ,  G01S13/12 ,  G01S13/524 ,  G01S13/528 ,  G01S13/66 ,  G01S13/70 ,  G01S13/87 ,  G01S13/872 ,  H01Q25/00

    摘要： An airborne radar system is disclosed utilizing multiple fixed antenna arrays mounted within the periphery of the aircraft to avoid aerodynamic modifications and optimumly placed to achieve 360* surveillance coverage. The arrays preferably include a fore mounted array, an aft mounted array, a port mounted array and a starboard mounted array for respectively firing beams in different azimuth sectors relative to the aircraft. Each array is comprised of dipole elements having phase shifters coupled thereto for steering a beam within the corresponding sector. The primary radar antennas time share an exciter, transmitter, receiver and signal processor through switching devices. Time allocation between antennas and between operational modes such as ''''search'''' or ''''track'''' is based on various factors such as mission objectives, current target characteristics and radar purpose. Time allocation is preferably determined by an ''''on line'''' stored program digital computer which generates a radar control command to define the parameters for each beam to be fired. This procedure involves calculating the priority value of each track and search beam to be fired in accordance with predetermined criteria contained in the stored program. The priority value of each track beam to be fired involves determining the update rate for that target which is calculated based on the characteristics of the target. Priority values are then determined based on a comparison between the elapsed time since the last update and the calculated update rate.

    摘要翻译： 公开了一种机载雷达系统，其利用安装在飞行器周边内的多个固定天线阵列，以避免空气动力学修改，并且最佳地放置以实现360度监视覆盖。 阵列优选地包括前安装阵列，后安装阵列，端口安装阵列和用于分别在相对于飞行器的不同方位角扇区中发射梁的右舷安装阵列。 每个阵列由具有耦合到其上的相移器的偶极元件组成，用于控制相应扇区内的光束。 主雷达天线通过交换设备共享激励器，发射器，接收器和信号处理器。 天线之间和操作模式（如“搜索”或“轨道”）之间的时间分配基于各种因素，如任务目标，当前目标特征和雷达目的。 时间分配最好由一个“在线”存储的程序数字计算机确定，该程序数字计算机产生一个雷达控制命令，以定义每个射击射束的参数。 该过程涉及根据存储的程序中包含的预定标准来计算要被触发的每个轨道和搜索波束的优先级值。 要触发的每个轨道光束的优先级值包括确定基于目标的特征计算出的该目标的更新速率。 然后基于自上次更新以来的经过时间与计算的更新率之间的比较来确定优先级值。