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公开(公告)号：US11726199B2
公开(公告)日：2023-08-15
申请号：US16979093
申请日：2019-03-08
Applicant: SAAB AB
Inventor： Hans Hellsten
CPC classification number: G01S13/885 , G01S13/90 , G01S13/9011 , G01S13/9019 , G01S13/9076
Abstract: A method for detecting a horizontally buried linear object is provided, the horizontally buried linear object having a longitudinal extension. The method comprises moving, with a flying platform comprising a radar for synthetic aperture radar, SAR, vertical imaging, along a trajectory corresponding to a synthetic aperture. The method further comprises transmitting and receiving radar signals while moving along the trajectory corresponding to the synthetic aperture. The method also comprises forming a SAR image based on collected data representing radar signal reflections received from the ground. The method additionally comprises detecting one or more features in the formed SAR image relating to the horizontally buried linear object. Said trajectory is oriented in a direction substantially perpendicular to an expected orientation of the longitudinal extension of the horizontally buried object and traversing the horizontally buried object.
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公开(公告)号：US10788587B2
公开(公告)日：2020-09-29
申请号：US16648314
申请日：2018-09-19
Applicant: SAAB AB
Inventor： Patrik Dammert , Hans Hellsten
Abstract: The present invention relates to a method for determining a synthetic aperture of a synthetic aperture radar, SAR, system using information from a global navigation satellite system, GNSS, which includes a plurality of satellites each transmitting a radio frequency signal comprising a unique pseudo random number, PRN. The method comprises: receiving the radio frequency signal from a group of satellites in the GNSS, determining a first maximum correlation peak of the PRN of the received radio frequency signal from each satellite in the group of satellites, determining the phase shift between the first determined maximum correlation peak and a second determined maximum correlation peak of a received PRN from the same satellite at a later time, for each satellite in the group of satellites, determining a line-of-sight, LOS, movement of the SAR system relative each of the satellites in the group of satellites by means of the determined phase shift for each satellite in the group of satellites, and determining a synthetic aperture using the LOS movement relative each satellite in the group of satellites.
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公开(公告)号：US10746862B2
公开(公告)日：2020-08-18
申请号：US16483069
申请日：2018-02-05
Applicant: SAAB AB
Inventor： Patrik Dammert , Hans Hellsten
IPC: G01S13/32 , G01S7/02 , G01S13/931 , G01S7/35
Abstract: The present invention relates to a method for a continuous arbitrary waveform radar configured for transmitting and receiving signals over a selected communication band. The method comprises: generating the radar transmit signal with a waveform having a non-monotonic frequency change, modifying the waveform to obtain at least one spectral notch and isolating reception and transmission by cancellation. Each spectral notch at a selectable frequency with a selectable bandwidth, and the waveform is modified to maintain the spectral density of the transmit radar signal.
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公开(公告)号：US10416303B2
公开(公告)日：2019-09-17
申请号：US15344774
申请日：2016-11-07
Applicant: SAAB AB
Inventor： Hans Hellsten
Abstract: A method and system for obtaining SAR images with reduced or eliminated surface clutter to detect subsurface targets, the method comprising the following steps:—selecting a first frequency and an incidence angle for the radar signal such that the ratio of surface backscattering to subsurface target backscattering is significantly larger for vertical polarization than for horizontal—obtaining vertically and horizontally polarized SAR images based on the same SAR path exploiting the selected first frequency and viewing angle—weighting and differencing the vertically and horizontally polarized SAR images so that the surface backscattering completely cancels between the two images and only the combination of the target backscattering components remains.
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公开(公告)号：US20170016978A1
公开(公告)日：2017-01-19
申请号：US15124885
申请日：2014-03-12
Applicant: SAAB AB
Inventor： Hans Hellsten
CPC classification number: G01S7/024 , G01S7/025 , G01S7/026 , G01S7/03 , G01S13/885 , H01Q1/28 , H01Q1/48 , H01Q7/00 , H01Q11/14 , H01Q25/00 , H04B7/10
Abstract: An antenna system (100) comprising a single antenna element having first (111) and second (112) antenna ports arranged to pass a respective first and second antenna signal. The first and second antenna signals being derived from a first common antenna signal (J1) and arranged to be essentially equal in envelope. An antenna pattern of the system being arranged to be selectable between a first antenna pattern having a first polarization and a second antenna pattern having a second polarization substantially orthogonal to the first polarization. The first antenna pattern being selected by setting the first and second antenna signal to have the same polarity on first (111) and second (112) antenna ports, the second antenna pattern being selected by setting the first and second antenna signal to have substantially opposite polarities on first (111) and second (112) antenna ports.
Abstract translation: 一种天线系统（100），包括具有第一（111）和第二（112）个天线端口的单个天线元件，其被布置成通过相应的第一和第二天线信号。 所述第一和第二天线信号从第一公共天线信号（J1）导出并被布置为在信封中基本相等。 该系统的天线方向图被布置为在具有第一极化的第一天线图案和具有与第一偏振基本正交的第二偏振的第二天线图案之间可选择。 通过将第一和第二天线信号设置为在第一（111）和第二（112）天线端口具有相同的极性来选择第一天线方向图，通过将第一和第二天线信号设置为具有基本相反的方式来选择第二天线方向图 第一（111）和第二（112）天线端口的极性。
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Patent Agency Ranking
公开(公告)号：US09519055B2
公开(公告)日：2016-12-13
申请号：US14649836
申请日：2012-12-17
Applicant: SAAB AB
Inventor： Hans Hellsten
CPC classification number: G01S13/9035 , G01S7/025 , G01S7/292 , G01S13/02 , G01S13/885 , G01S13/90 , G01S2013/9076
Abstract: A method and system for obtaining SAR images with reduced or eliminated surface clutter to detect subsurface targets, the method comprising the following steps: —selecting a first frequency and an incidence angle for the radar signal such that the ratio of surface backscattering to subsurface target backscattering is significantly larger for vertical polarization than for horizontal—obtaining vertically and horizontally polarized SAR images based on the same SAR path exploiting the selected first frequency and viewing angle—weighting and differencing the vertically and horizontally polarized SAR images so that the surface backscattering completely cancels between the two images and only the combination of the target backscattering components remains.
Abstract translation: 一种用于获得具有减少或消除的表面杂波以检测地下目标的SAR图像的方法和系统，该方法包括以下步骤： - 选择雷达信号的第一频率和入射角，使得表面后向散射与次表面目标反向散射的比率 对于垂直偏振比垂直和水平偏振的SAR图像大得多，基于相同的SAR路径，利用所选择的第一频率和视角加权并差分垂直和水平偏振的SAR图像，使得表面后向散射完全抵消 两个图像和目标后向散射分量的组合仍然存在。
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公开(公告)号：US20150331097A1
公开(公告)日：2015-11-19
申请号：US14649836
申请日：2012-12-17
Applicant: SAAB AB
Inventor： Hans Hellsten
CPC classification number: G01S13/9035 , G01S7/025 , G01S7/292 , G01S13/02 , G01S13/885 , G01S13/90 , G01S2013/9076
Abstract: A method and system for obtaining SAR images with reduced or eliminated surface clutter to detect subsurface targets, the method comprising the following steps: —selecting a first frequency and an incidence angle for the radar signal such that the ratio of surface backscattering to subsurface target backscattering is significantly larger for vertical polarization than for horizontal —obtaining vertically and horizontally polarized SAR images based on the same SAR path exploiting the selected first frequency and viewing angle —weighting and differencing the vertically and horizontally polarized SAR images so that the surface backscattering completely cancels between the two images and only the combination of the target backscattering components remains.
Abstract translation: 一种用于获得具有减少或消除的表面杂波以检测地下目标的SAR图像的方法和系统，该方法包括以下步骤： - 选择雷达信号的第一频率和入射角，使得表面后向散射与次表面目标反向散射的比率 相对于采用所选择的第一频率和视角加权的相同SAR路径，垂直偏振显着大于垂直和水平偏振的SAR图像，并且区分垂直和水平偏振的SAR图像，使得表面后向散射完全抵消 两个图像和目标后向散射分量的组合仍然存在。
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公开(公告)号：US10571560B2
公开(公告)日：2020-02-25
申请号：US15761955
申请日：2015-09-21
Applicant: SAAB AB
Inventor： Hans Hellsten
Abstract: A method and a device for detecting at least one target in an image, wherein the image comprises a set of pixels with a magnitude assigned to each pixel is provided. The method comprises an iterative process until the K+1th target does not show a probability increase above a predetermined threshold value. The method is performed by creating a candidate free image, calculating, for the candidate free image, the probability of there being a target at each pixel, by using Bayes theorem, determining a location of the candidate target K+1 in the image, determining the probability that there is a target at the determined location, by determining the calculated probability of there being a target at the determined location. By performing the above, the most probable locations for targets in the image are located together with the probability that the location holds a true target.
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公开(公告)号：US20170299716A1
公开(公告)日：2017-10-19
申请号：US15344774
申请日：2016-11-07
Applicant: SAAB AB
Inventor： Hans Hellsten
CPC classification number: G01S13/904 , G01S7/025 , G01S7/292 , G01S13/02 , G01S13/885 , G01S13/90 , G01S13/9076
Abstract: A method and system for obtaining SAR images with reduced or eliminated surface clutter to detect subsurface targets, the method comprising the following steps: -selecting a first frequency and an incidence angle for the radar signal such that the ratio of surface backscattering to subsurface target backscattering is significantly larger for vertical polarization than for horizontal -obtaining vertically and horizontally polarized SAR images based on the same SAR path exploiting the selected first frequency and viewing angle -weighting and differencing the vertically and horizontally polarized SAR images so that the surface backscattering completely cancels between the two images and only the combination of the target backscattering components remains.
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公开(公告)号：US09618606B2
公开(公告)日：2017-04-11
申请号：US15124885
申请日：2014-03-12
Applicant: SAAB AB
Inventor： Hans Hellsten
CPC classification number: G01S7/024 , G01S7/025 , G01S7/026 , G01S7/03 , G01S13/885 , H01Q1/28 , H01Q1/48 , H01Q7/00 , H01Q11/14 , H01Q25/00 , H04B7/10
Abstract: An antenna system (100) comprising a single antenna element having first (111) and second (112) antenna ports arranged to pass a respective first and second antenna signal. The first and second antenna signals being derived from a first common antenna signal (J1) and arranged to be essentially equal in envelope. An antenna pattern of the system being arranged to be selectable between a first antenna pattern having a first polarization and a second antenna pattern having a second polarization substantially orthogonal to the first polarization. The first antenna pattern being selected by setting the first and second antenna signal to have the same polarity on first (111) and second (112) antenna ports, the second antenna pattern being selected by setting the first and second antenna signal to have substantially opposite polarities on first (111) and second (112) antenna ports.
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