公开(公告)号：US5686922A

公开(公告)日：1997-11-11

申请号：US692573

申请日：1996-08-06

申请人： Herbert C. Stankwitz ,  Michael R. Kosek

发明人： Herbert C. Stankwitz ,  Michael R. Kosek

IPC分类号： G01S13/90 ,  G01S13/00

CPC分类号： G01S13/9035

摘要： In systems wherein signal compression is performed using matched filters or transforms, as in the case of radar, multiple extrapolations are used to resolve beyond the limits of defraction. In one example, development of the method begins with a complex, uniformly weighted SAR or inverse SAR signal represented by a rectangle function. After performing an FFT, adaptive sidelobe reduction is carried out followed by an inverse weighting and truncation, after which the original signal is used to replace the center portion of the extrapolated signal. The signal is again transformed and sidelobe reduced, and inverse weighting and truncation are again performed, followed by the original data replacement step. The extrapolation procedure may be repeated end times, extrapolating each time by a factor K for a total extrapolation factor of K=k.sup.n.

摘要翻译： 在使用匹配的滤波器或变换进行信号压缩的系统中，如在雷达的情况下，使用多个外插来超越衰减极限。 在一个示例中，该方法的开发以由矩形函数表示的复杂均匀加权的SAR或反SAR信号开始。 在执行FFT之后，执行自适应旁瓣减少，随后进行逆加权和截断，之后使用原始信号来代替外推信号的中心部分。 该信号被再次变换并且旁瓣减小，并且再次执行反加权和截断，随后是原始数据替换步骤。 外推程序可以是重复的结束时间，对于总外推因子K = kn，每次外推K因子K。

公开(公告)号：US5854602A

公开(公告)日：1998-12-29

申请号：US842094

申请日：1997-04-28

申请人： Herbert C. Stankwitz ,  Ken W. Burgener

发明人： Herbert C. Stankwitz ,  Ken W. Burgener

IPC分类号： G01S13/90

CPC分类号： G01S13/9035

摘要： A high-order synthetic aperture radar (SAR) autofocusing method decomposes phase error into basis function components, one order at a time. Image patches are partitioned into a plurality of subapertures in accordance with positive- and negative-going slope of the basis function at each order. A positive mask is applied to each subaperture within which the basis function is increasing in slope, whereas a negative mask is applied to each subaperture within which the basis function is decreasing in slope. The results are then correlated to obtain a focused image, with the principle of map-drift preferably being used to compute phase-amplitude weights. The method may be uniformly applied, enabling the steps to be performed at a plurality of increasingly higher orders without performance degradation.

摘要翻译： 高阶合成孔径雷达（SAR）自动对焦方法将相位误差分解为基函数分量，一次一次。 图像补丁根据每个顺序的基函数的正和负斜率被分割成多个子孔径。 将正面掩模应用于其中基础函数在斜率上增加的每个子孔径，而对每个子孔径施加负面掩模，其中基函数的斜率下降。 然后将结果相关以获得聚焦图像，优选地使用地图漂移的原理来计算相位幅度权重。 可以均匀地应用该方法，使得能够以多个越来越高的顺序执行步骤而不降低性能。

公开(公告)号：US5349359A

公开(公告)日：1994-09-20

申请号：US58174

申请日：1993-05-10

申请人： Rodney J. Dallaire ,  Herbert C. Stankwitz

发明人： Rodney J. Dallaire ,  Herbert C. Stankwitz

IPC分类号： G01S13/90 ,  H01Q21/22 ,  G01S13/89

CPC分类号： G01S13/90 ,  H01Q21/22

摘要： Spatially variant apodization is a digital image processing technique for eliminating sidelobes produced by Fourier transform of finite data sequences without compromising mainlobe width. This process allows each sample or pixel in an image to receive its own frequency domain aperture amplitude weighting function from an infinite number of possible weighting functions. In its simplest form the weight is a function of the negative of the current sample divided by the sum of the neighboring samples, and the function is limited to a predetermined range such as the range between zero and one half.

摘要翻译： 空间变异变迹是一种数字图像处理技术，用于消除有限数据序列的傅里叶变换产生的旁瓣，而不会影响主瓣宽度。 该过程允许图像中的每个样本或像素从无限数量的可能加权函数接收其自己的频域孔径幅度加权函数。 在其最简单的形式中，权重是当前样本的负值除以相邻样本的总和的函数，并且该函数被限制在诸如零和一半之间的范围的预定范围。

公开(公告)号：US07348917B2

公开(公告)日：2008-03-25

申请号：US11339532

申请日：2006-01-26

申请人： Herbert C. Stankwitz ,  Stephen P. Taylor

发明人： Herbert C. Stankwitz ,  Stephen P. Taylor

IPC分类号： G01S13/90

CPC分类号： G01S13/9035 ,  G01S7/282 ,  G01S13/22

摘要： Systems and methods of improving synthetic aperture radar (SAR) system are disclosed. In particular, an example system includes a radar signal radiator configured to transmit radar signal pulses that have a partial bandwidth at a regular interval. The partial bandwidth is a portion of a full bandwidth that said radar signal radiator is designed to generate. The example system also includes a receiver configured to receive radar signals returned in response to said transmitted radar signal pulses, and a processor configured to extrapolate said received signals to said full bandwidth, to thereby create high resolution SAR images.

摘要翻译： 公开了改进合成孔径雷达（SAR）系统的系统和方法。 特别地，示例系统包括被配置为以规则的间隔传输具有部分带宽的雷达信号脉冲的雷达信号辐射器。 部分带宽是所述雷达信号辐射器被设计为产生的全带宽的一部分。 示例系统还包括被配置为接收响应于所述发送的雷达信号脉冲而返回的雷达信号的接收器，以及被配置为将所述接收信号外推到所述全带宽的处理器，从而产生高分辨率SAR图像。