公开(公告)号：US5461392A

公开(公告)日：1995-10-24

申请号：US232918

申请日：1994-04-25

申请人： Charles J. Mott ,  Clifton Quan

发明人： Charles J. Mott ,  Clifton Quan

IPC分类号： H01Q5/00 ,  H01Q5/42 ,  H01Q13/08 ,  H01Q17/00 ,  H01Q21/06 ,  H01Q21/00 ,  H01Q21/24 ,  H01Q13/10

CPC分类号： H01Q21/064 ,  H01Q13/085 ,  H01Q17/001 ,  H01Q5/42

摘要： Low frequency radiating elements are embedded in a flared notch array. The flared notch array forms a series of parallel troughs in which absorptive loads are placed to reduce the antenna radar cross section. The low frequency radiating elements are embedded in the array transverse to the troughs at or below the level of the absorptive loads, and excite several troughs. The absorptive load material is absorptive in the operating band of the flared notch array, but appears as a relatively low loss dielectric at the lower frequencies of operation of the low frequency radiating elements. The low frequency radiating elements can perform Identify Friend or Foe functions in the UHF and L-band regions of the spectrum, while the flared notch array operates at X-band.

摘要翻译： 低频辐射元件嵌入在扩口凹口阵列中。 扩口凹口阵列形成一系列平行槽，其中放置吸收载荷以减少天线雷达横截面。 低频辐射元件以等于或低于吸收载荷的水平的方式嵌入在横向于槽的阵列中，并激发几个槽。 吸收负载材料在扩口凹口阵列的工作带中是吸收的，但在低频辐射元件的较低工作频率下表现为相对较低的损耗介质。 低频辐射元件可以在频谱的UHF和L波段区域中执行Identify Friend或Foe功能，而扩口陷波阵列在X波段下工作。

公开(公告)号：US06664920B1

公开(公告)日：2003-12-16

申请号：US08154051

申请日：1993-11-18

申请人： Charles J. Mott ,  Trung T. Nguyen ,  Edmond E. Griffin, II

发明人： Charles J. Mott ,  Trung T. Nguyen ,  Edmond E. Griffin, II

IPC分类号： G01S1338

CPC分类号： G01S7/4056 ,  G01S7/038 ,  G01S13/343 ,  G01S13/931

摘要： A cancellation technique embodied in a system and a radar signal processing method that is employed to detect near-range targets. The present invention uses a frequency-modulation continuous-wave (FMCW) or stepped frequency waveform and is capable of detecting near-range targets that would normally be obscured by transmitter leakage and internal reflections. This cancellation technique works by transmitting one or more reference ramp signals and then subtracting the coherent average of the transmitted reference ramp signals from a group of succeeding transmitted and received ramp return -signals. The resulting group of FM ramp return signals is noncoherently integrated to achieve more stable target detection statistics. More particularly, the present technique implements the following processing steps. Generating a predetermined number of reference ramp signals. Coherently averaging target return signals corresponding to transmitted reference ramp signals to produce a reference average signal. Transmitting additional ramp signals. Subtracting the reference average signal from each ramp return signal to produce a cancelled ramp signal. Fourier transforming each cancelled ramp signal. Magnitude detecting the Fourier transform signal. Noncoherently integrating the magnitude detected signal. Thresholding the integrated signal. Centroiding the thresholded signal, wherein centroid position is indicative of the range to the nearest target. Displaying target data for a target-whose position is less than a predetermined cutoff range.

摘要翻译： 体现在系统中的消除技术和用于检测近距离目标的雷达信号处理方法。 本发明使用频率调制连续波（FMCW）或阶梯频率波形，并且能够检测通常被发射机泄漏和内部反射遮蔽的近距离目标。 该消除技术通过发送一个或多个参考斜坡信号，然后从一组随后发送和接收的斜坡返回信号中减去所发送的参考斜坡信号的相干平均值来工作。 所得到的一组FM斜坡返回信号是非相干集成的，以实现更稳定的目标检测统计。 更具体地，本技术实现了以下处理步骤。 产生预定数量的参考斜坡信号。 对应于发送的参考斜坡信号的目标返回信号相干平均以产生参考平均信号。 发送额外的斜坡信号。 从每个斜坡返回信号中减去参考平均信号，以产生取消的斜坡信号。 傅里叶变换每个取消的斜坡信号。 检测傅里叶变换信号的幅度。 非均匀积分幅度检测信号。 阈值整合信号。 调整阈值信号，其中质心位置指示到最近目标的范围。 显示目标的目标数据，该目标数据的位置小于预定的截止范围。