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1. 发明授权

US11592546B1 Angle-Doppler Keystone formatting for airborne look-down radar system 有权
公开(公告)号：US11592546B1
公开(公告)日：2023-02-28
申请号：US16371826
申请日：2019-04-01
申请人： SRC, INC.
发明人： Harvey K. Schuman , Daniel D. Thomas, Jr. , Jason M. Steeger , Lun Z. Chen
IPC分类号： G01S13/524 , G01S13/58 , G01S13/90 , G01S7/41 , G01S7/28 , G01S13/42 , G01S13/02
摘要： An airborne radar system and signal interpretation approach that detects slow moving ground targets using angle and Doppler of Keystone formatting process, and is referred to as Angle-Doppler Keystone Formatting (ADK). ADK collapses the clutter ridge to a constant Doppler or to a constant angle, thereby transforming a clutter ridge in angle-Doppler space into a horizontal line of constant Doppler or a vertical line of constant angle. Clutter may then be filtered more effectively, such as by using multiple beams as the source of STAP training data or by using multiple Doppler bins.

2. 发明授权

US10209353B2 Bandwidth enhancement beamforming 有权
公开(公告)号：US10209353B2
公开(公告)日：2019-02-19
申请号：US14716765
申请日：2015-05-19
申请人： SRC, Inc.
发明人： Daniel D. Thomas, Jr.
IPC分类号： G01S13/02 , G01S13/42 , H04B7/0408
摘要： A system and method for phased-array radar that is capable of accurate phase-only steering at any unambiguous angle is provided. In various embodiments, system and method that compensates for the varying effective element spacing of phased array radar, which occurs as a result of transmitting a wideband signal with phase shifters operating at a fixed phase, by interpolating and resampling across all elements, per frequency, to generate a desired effective spacing between the elements.

3. 发明授权

US10422869B2 Constant pulse repetition frequency techniques for eliminating second time around returns in pulsed doppler radar 有权
公开(公告)号：US10422869B2
公开(公告)日：2019-09-24
申请号：US15489304
申请日：2017-04-17
申请人： SRC, Inc.
发明人： Robert E. Hiemenz , Daniel D. Thomas, Jr.
IPC分类号： G01S13/20 , G01S13/28 , G01S13/58
摘要： The present invention relates to a method and system for identifying and eliminating second time-around ambiguous targets and, more particularly, to a method and system for identifying and eliminating second time-around ambiguous targets using waveform phase modulation.

4. 发明授权

US09285469B1 Multiplatform GMTI radar with enhanced SNR, monopulse 有权
标题翻译：多平台GMTI雷达具有增强的SNR，单脉冲
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.
发明人： Harvey K. Schuman , Daniel D. Thomas, Jr.
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。

5. 发明授权

US10459061B2 FFT-based displaced phase center array/along-track interferometry architecture 有权
公开(公告)号：US10459061B2
公开(公告)日：2019-10-29
申请号：US14706028
申请日：2015-05-07
申请人： SRC, Inc.
发明人： Daniel D. Thomas, Jr.
IPC分类号： G01S3/14 , H04N19/513 , H04N19/547 , G01S13/90
摘要： A radar architecture comprising a computing device having a DC subtraction module, programmed to average a first value of a first pixel from a first received SAR image and a second value of a second pixel from a second received SAR image, to produce an averaged value, and to subtract the averaged value from the first value, resulting in a first DC subtracted pixel value, and to subtract the averaged value from the second value, resulting in a second DC subtracted pixel value; a DFT processing module programmed to receive the first DC subtracted pixel value and the second DC subtracted pixel value and to output a first DFT output comprising a plurality Doppler bins; and a detector module programmed to determine if the output of the DFT represents the presence of a target, and to estimate range-rate via a lookup table.

6. 发明授权

US09625574B2 Constant pulse repetition frequency techniques for eliminating second time around returns in pulsed doppler radar 有权
公开(公告)号：US09625574B2
公开(公告)日：2017-04-18
申请号：US14175517
申请日：2014-02-07
申请人： SRC, Inc.
发明人： Robert E. Hiemenz , Daniel D. Thomas, Jr.
IPC分类号： G01S7/292 , G01S13/20 , G01S13/28 , G01S13/58
CPC分类号： G01S13/20 , G01S13/282 , G01S13/582
摘要： The present invention relates to a method and system for identifying and eliminating second time-around ambiguous targets and, more particularly, to a method and system for identifying and eliminating second time-around ambiguous targets using waveform phase modulation.

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