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公开(公告)号：US10663563B2
公开(公告)日：2020-05-26
申请号：US15715568
申请日：2017-09-26
申请人： SRC, Inc.
发明人： Harvey K. Schuman
摘要： The present invention is directed to an antenna system and a method that is configured to compute calibration element voltage gain patterns as functions of a digital antenna model and a plurality of complex beamformer voltages, determine calibration through path transfer functions from the plurality of complex voltages, and remove the calibration element voltage gain patterns from the calibration through path transfer functions to determine a beamforming network transfer function. The beamforming network transfer function and the far-field element voltage gain patterns are combined to obtain a system transfer function used to revise a calibration table.
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公开(公告)号：US09285469B1
公开(公告)日：2016-03-15
申请号：US14526775
申请日：2014-10-29
申请人： SRC, Inc.
IPC分类号： G01S13/44 , G01S13/524 , G01S13/87 , G01S7/00 , G01S7/28
CPC分类号： G01S13/5248 , G01S7/003 , G01S7/2813 , G01S13/44 , G01S13/4418 , G01S13/4427 , G01S13/4454 , G01S13/4472 , G01S13/449 , G01S13/5244 , G01S13/87 , G01S13/878
摘要： The present invention is directed to a ground moving target (GMTI) radar that can detect targets, including dismounts, with very small minimum detectable velocities by combining signals from antennas on different spatially separated platforms in a main beam clutter-suppressing spatially adaptive process without requiring that the relative positions of the antenna phase centers be accurately tracked. The clutter nulling is in addition to that provided by the Doppler filters. The spatial displacement provides a narrow mainbeam clutter null reducing undesired target suppression. The clutter-suppressing spatially adaptive structure is used in both the sum and delta channels of the monopulse processor so that the beam distortion caused by the spatial nulling is compensated for, and the monopulse look-up process is preserved to maintain angle accuracy. Noncoherent integration is employed to recover signal to noise loss resulting from the uncertain relative locations of the platforms.
摘要翻译： 本发明涉及一种地面移动目标（GMTI）雷达，其可以通过在主波束杂波抑制空间自适应过程中组合来自不同空间分离的平台上的天线的信号，以非常小的最小可检测速度来检测目标，包括卸载，而不需要 可以准确跟踪天线相位中心的相对位置。 杂波归零除了由多普勒滤波器提供的零点之外。 空间位移提供窄主干杂波零点减少不期望的目标抑制。 杂波抑制空间自适应结构用于单脉冲处理器的和通道和三角波通道，使得由空间零位引起的波束失真得到补偿，并保持单脉冲查找过程以保持角度精度。 采用非相干积分来恢复由于平台不确定的相对位置导致的信噪比损失。
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公开(公告)号：US11509385B1
公开(公告)日：2022-11-22
申请号：US17140596
申请日：2021-01-04
申请人： SRC, Inc.
发明人： Harvey K. Schuman
摘要： A radar system includes an antenna array including a plurality of antenna elements; and a transmitter portion coupled to the antenna array, the transmitter portion being configured to sequentially transmit a first transmit beam and a second transmit beam from a single pulse, the first transmit beam and second transmit beam being formed using the same aperture of the antenna array, wherein a skew angle of the first transmit beam is distinct from a skew angle of the second beam. Such radar system alternatively transmitting through subarrays and receiving each via the entire array and combining the signals such that the transmit and receive parts of one of two 2-way beams point in the same direction and the transmit and receive parts of the second 2-way beam point in the same direction and these directions are within a standard beamwidth of each other.
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公开(公告)号：US10649075B2
公开(公告)日：2020-05-12
申请号：US15715492
申请日：2017-09-26
申请人： SRC, Inc.
发明人： Harvey K. Schuman , Ping G. Li
IPC分类号： G01S13/524 , G01S13/00 , G01S7/288 , G01S13/87 , G01S7/41
摘要： The present invention is directed to a method for processing radar signals in a distributed array radar that includes a first airborne platform and at least one second airborne platform. Doppler filtered radar return samples are obtained and a weight value is calculated as a function of first clutter signals and second clutter signals. The weight value is employed in a weight vector that is computed, as well, from a steering vector that need not be matched to the target vector. The weight vector is applied to a signal vector corresponding to the Doppler filtered radar return samples. An open loop feedback is implemented and configured to create beam pattern nulls at angles corresponding to the plurality of first interference signals within each of the Doppler bins without substantially tracking a position or velocity of the first airborne platform or the at least one second airborne platform.
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公开(公告)号：US20180164407A1
公开(公告)日：2018-06-14
申请号：US15715568
申请日：2017-09-26
申请人： SRC, Inc.
发明人： Harvey K. Schuman
CPC分类号： G01S7/4026 , G01S7/2813 , G01S7/40 , G01S13/4463
摘要： The present invention is directed to an antenna system and a method that is configured to compute calibration element voltage gain patterns as functions of a digital antenna model and a plurality of complex beamformer voltages, determine calibration through path transfer functions from the plurality of complex voltages, and remove the calibration element voltage gain patterns from the calibration through path transfer functions to determine a beamforming network transfer function. The beamforming network transfer function and the far-field element voltage gain patterns are combined to obtain a system transfer function used to revise a calibration table.
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公开(公告)号：US20170301988A1
公开(公告)日：2017-10-19
申请号：US14547461
申请日：2014-11-19
申请人： SRC, Inc.
发明人： Harvey K. Schuman
CPC分类号： G01S7/4026 , G01S7/2813 , G01S7/40 , G01S13/4463
摘要： The present invention is directed to an antenna system and a method that is configured to compute calibration element voltage gain patterns as functions of a digital antenna model and a plurality of complex beamformer voltages, determine calibration through path transfer functions from the plurality of complex voltages, and remove the calibration element voltage gain patterns from the calibration through path transfer functions to determine a beamforming network transfer function. The beamforming network transfer function and the far-field element voltage gain patterns are combined to obtain a system transfer function used to revise a calibration table.
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7.发明申请Methods And Systems For Multiple Input Multiple Output Synthetic Aperture Radar Ground Moving Target Indicator 审中-公开多输入多输出合成孔径雷达地面移动目标指示器的方法和系统公开(公告)号：US20140266868A1
公开(公告)日：2014-09-18
申请号：US14215246
申请日：2014-03-17
申请人： SRC, Inc.
发明人： Harvey K. Schuman
CPC分类号： G01S13/9029 , G01S13/325
摘要： A multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) system. The radar system includes spatially offset transmitting antennas simultaneously transmitting at least two distinguishable waveform signals and receiving antennas receiving incoming waveform returns for each of the distinguishable waveform signals. The radar system also includes a displaced phase center antenna (DPCA) processing unit adapted to perform processing on the incoming waveform returns, and a synthetic aperture radar processing unit adapted to produce a plurality of spatially-coincident SAR-processed signals. The radar system also generates a plurality of clutter-suppressed signals using the spatially-coincident SAR-processed signals. For each of two MIMO transmissions from spatially displaced transmitters, clutter is cancelled simultaneously in at least two spatially displaced receive channels via DPCA processing. This results in at least two spatially displaced but simultaneous clutter cancelled complex SAR images, which are combined in a monopulse processor to enhance target detection and unambiguously determine target angle.
摘要翻译： 多输入多输出（MIMO）合成孔径雷达（SAR）系统。 雷达系统包括空间偏移的发射天线，同时发射至少两个可区别的波形信号，以及接收天线，接收每个可区分的波形信号的进入波形返回。 所述雷达系统还包括适于对所述输入波形返回执行处理的位移相位中心天线（DPCA）处理单元，以及合成孔径雷达处理单元，其适于产生多个空间上重合的经SAR处理的信号。 雷达系统还使用空间一致的经SAR处理的信号产生多个杂波抑制信号。 对于来自空间位移发射机的两个MIMO传输中的每一个，通过DPCA处理在至少两个空间位移的接收信道中同时消除杂波。 这导致至少两个空间位移但同时杂波消除的复合SAR图像，其被组合在单脉冲处理器中以增强目标检测并明确地确定目标角度。
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公开(公告)号：US20220397662A1
公开(公告)日：2022-12-15
申请号：US17140596
申请日：2021-01-04
申请人： SRC, Inc.
发明人： Harvey K. Schuman
摘要： A radar system includes an antenna array including a plurality of antenna elements; and a transmitter portion coupled to the antenna array, the transmitter portion being configured to sequentially transmit a first transmit beam and a second transmit beam from a single pulse, the first transmit beam and second transmit beam being formed using the same aperture of the antenna array, wherein a skew angle of the first transmit beam is distinct from a skew angle of the second beam. Such radar system alternatively transmitting through subarrays and receiving each via the entire array and combining the signals such that the transmit and receive parts of one of two 2-way beams point in the same direction and the transmit and receive parts of the second 2-way beam point in the same direction and these directions are within a standard beamwidth of each other.
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公开(公告)号：US11482988B1
公开(公告)日：2022-10-25
申请号：US17349201
申请日：2021-06-16
申请人： SRC, Inc.
摘要： A system and method for tuning a transistor-based circuit. The system includes a negative impedance converter circuit having a capacitor, a first transistor, and a second transistor. As a current travels through the capacitor, the first transistor and the second transistor each sample voltage at the capacitor and invert the voltage at an input of the negative impedance converter circuit. The negative impedance converter circuit also has a third transistor in series with the capacitor. The third transistor has a base voltage. Changing the base voltage of the third transistor changes the voltage sampled by the first transistor and the second transistor.
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公开(公告)号：US20190219670A1
公开(公告)日：2019-07-18
申请号：US16209469
申请日：2018-12-04
申请人： SRC, Inc.
CPC分类号： G01S7/2813 , G01S13/68 , H01Q21/0025 , H01Q21/061
摘要： A transmit-receive radar system having multiple sub-apertures aligned in an offset, off-centered cross pattern that allows for searching of a sub-aperture pattern for the peak response without having to retransmit beams. The placement of the physical apertures combined with the use of MIMO operations provides a non-uniform distribution of virtual sub-apertures that suppresses ambiguous grading lobes and maintains angle resolution in a manner equivalent to that of non-MIMO approaches. As a result, target detection is enabled within a significantly larger angular area than in a non-MIMO configuration.
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