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1. 依法登记的发明

USH2222H1 Normalized matched filter—a low rank approach 有权
公开(公告)号：USH2222H1
公开(公告)日：2008-08-05
申请号：US11251007
申请日：2005-10-13
申请人： Muralidhar Rangaswamy , Freeman Lin
发明人： Muralidhar Rangaswamy , Freeman Lin
IPC分类号： H03D1/00 , G01S13/534
摘要： This invention addresses the problem of radar target detection in severely heterogeneous clutter environments. Specifically, we present the performance of the normalized matched filter test in a background of disturbance consisting of clutter having a covariance matrix with known structure and unknown scaling plus background white Gaussian noise. It is shown that when the clutter covariance matrix is low rank, the (LRNMF) test retains invariance with respect to the unknown scaling as well as the background noise level and has an approximately constant false alarm rate (CFAR). Therefore, a technique known as self-censoring reiterative fast maximum likelihood/adaptive power residue (SCRFML/APR) is developed to treat this problem and its performance is discussed. The SCRFML/AP method is used to estimate the unknown covariance matrix in the presence of outliers. This covariance matrix estimate can then be used in the LRNAMF or any other eigen-based adaptive processing technique.

2. 发明授权

US5640429A Multichannel non-gaussian receiver and method 失效
标题翻译：多通道非高斯接收机和方法
公开(公告)号：US5640429A
公开(公告)日：1997-06-17
申请号：US376959
申请日：1995-01-20
申请人： James H. Michels , Muralidhar Rangaswamy
发明人： James H. Michels , Muralidhar Rangaswamy
IPC分类号： G01S7/292 , H03D1/00
CPC分类号： G01S7/292
摘要： A process and system for improving the detection of signals in additive correlated non-Gaussian noise using multichannel data. This improves detection performance of receivers through the signal processing architecture when the observation data X(n) is first split into an upper and lower path. In the upper path, the known signal is first subtracted from the data and then passed directly to the prediction error filter. The output of the prediction error filters are then input to the zero-mean non-linear processor and their associated estimated variances are used to determine H.sub.0 and H.sub.1 where H.sub.0 denotes the condition where no signal is present in the data and H.sub.1 denotes the signal present case.
摘要翻译：一种使用多通道数据改进加性相关非高斯噪声信号检测的过程和系统。当观测数据X（n）首先被分割成上下路径时，这通过信号处理架构提高了接收机的检测性能。在上部路径中，首先从数据中减去已知信号，然后直接传递给预测误差滤波器。然后将预测误差滤波器的输出输入到零均值非线性处理器，并且使用它们相关联的估计方差来确定H0和H1，其中H0表示数据中不存在信号的条件，而H1表示存在信号案件。

3. 发明授权

US06226321B1 Multichannel parametric adaptive matched filter receiver 失效
标题翻译：多通道参数自适应匹配滤波接收机
公开(公告)号：US06226321B1
公开(公告)日：2001-05-01
申请号：US09074821
申请日：1998-05-08
申请人： James H. Michels , Muralidhar Rangaswamy , Jaime R. Román , Dennis W. Davis
发明人： James H. Michels , Muralidhar Rangaswamy , Jaime R. Román , Dennis W. Davis
IPC分类号： H04B346
CPC分类号： G01S7/295 , G01S7/292
摘要： Apparatus and method for improving the detection of signals obscured by either correlated Gaussian or non-Gaussian noise plus additive white Gaussian noise using Estimates from multi-channel data of model parameters that describe the noise disturbance correlation are obtained from data that contain signal-free data vectors, referred to as “secondary” or “reference” cell data. These parameters form the coefficients of a multi-channel whitening filter. A data vector to be tested for the presence of a signal passes through the multi-channel whitening filter. The filter's output is then processed to form a test statistic. The test statistic is compared to a threshold value to decide whether a signal is “present” or “absent”. Embodiments of the apparatus and method include estimating the signal amplitude both implicitly and explicitly and calculating test statistics for signal detection in both Gaussian and non-Gaussian noise.
摘要翻译：使用描述噪声干扰相关性的模型参数的来自多通道数据的估计值，通过相关高斯或非高斯噪声加上加性白高斯噪声遮蔽的信号检测装置和方法来自包含无信号数据的数据向量，称为“次”或“参考”单元数据。这些参数形成多通道白化滤波器的系数。要测试信号的存在的数据向量通过多通道白化滤波器。然后处理过滤器的输出以形成测试统计量。将测试统计量与阈值进行比较，以确定信号是“存在”还是“不存在”。该装置和方法的实施例包括：隐含地和明确地估计信号幅度，并计算高斯和非高斯噪声中的信号检测的测试统计。

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