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。