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公开(公告)号：EP2359159B1
公开(公告)日：2019-05-15
申请号：EP08878158.8
申请日：2008-11-11
Applicant: Saab AB
Inventor： HELLSTEN, Hans
IPC: G01S13/90
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公开(公告)号：EP1618408B1
公开(公告)日：2012-07-04
申请号：EP04729564.7
申请日：2004-04-26
Applicant: Saab AB
Inventor： HELLSTEN, Hans
CPC classification number: G01S7/023 , G01S7/4008 , G01S13/90
Abstract: A filter scheme for broadcast interference cancellation that is computationally efficient and numerically robust Airborne Low Frequency Synthetic Aperture Radar (SAR) operating in the VHF and UHF bands has been shown. At least interference Doppler filtering or interference cancellation is utilised. The interference cancellation involves prediction of the interference for each particular reception interval of mixed interference and radar ground response. This prediction is then coherently subtracted from the incoming signal.
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公开(公告)号：EP1820045B1
公开(公告)日：2008-09-17
申请号：EP04809016.1
申请日：2004-11-26
Applicant: Saab AB
Inventor： HELLSTEN, Hans
IPC: G01S13/90
CPC classification number: H01Q3/2611 , G01S7/2813 , G01S13/0209 , G01S13/90
Abstract: A method of for processing signals in a radar system is shown comprising an antenna system having at least two antenna elements, a beam forming arrangement (ABF_RX, ABF_TX) for selectively steering the directivity of the antenna system in a given selected direction, the directivity of the antenna system having a main lobe in the selected direction and a back lobe (BL) in another direction and of a lower magnitude than the main lobe. By utilizing various scale and subtract processing both noise levels and ghost signals can be considerably reduced. A SAR radar apparatus has moreover been shown.
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Patent Agency Ranking
公开(公告)号：EP3353567A1
公开(公告)日：2018-08-01
申请号：EP15904822.2
申请日：2015-09-21
Applicant: Saab AB
Inventor： HELLSTEN, Hans
CPC classification number: G01S13/90 , G01S7/41 , G01S7/414 , G06K9/0063 , G06K9/6203 , G06K9/6278
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：EP3117484A1
公开(公告)日：2017-01-18
申请号：EP14885561.2
申请日：2014-03-12
Applicant: Saab AB
Inventor： HELLSTEN, Hans
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 (J
1 ) 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）天线端口和第二（112）个天线端口的单个天线元件，所述天线端口布置成通过相应的第一和第二天线信号。 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成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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公开(公告)号：EP2932296A1
公开(公告)日：2015-10-21
申请号：EP12890554.4
申请日：2012-12-17
Applicant: SAAB AB
Inventor： HELLSTEN, Hans
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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28.发明公开WIDEBAND TRANSMITTER/RECEIVER ARRANGEMENT FOR MULTIFUNCTIONAL RADAR AND COMMUNICATION 有权BREITBANDSENDER- /接待安排，多功能雷达和通信
公开(公告)号：EP2537257A1
公开(公告)日：2012-12-26
申请号：EP10846250.8
申请日：2010-02-17
Applicant: Saab AB
Inventor： HELLSTEN, Hans
CPC classification number: H04B1/44 , G01S7/006 , G01S7/03 , G01S7/038 , G01S7/4021 , G01S13/32 , G01S13/90
Abstract: The object of the present invention is to provide an inventive wideband transmitter/receiver arrangement for transmitting and receiving electromagnetic waves, wherein said transmitter/receiver arrangement comprises a digital arbitrary waveform generator AWG (1 ) connected to a transmitter (19). Said waveform generator (1 ) is configured to generate an arbitrary waveform within a given bandwidth. Said transmitter/receiver arrangement further comprises an antenna arrangement (5) configured to emit a transmitter signa! (S1), and to receive an incident signal (S2), and a receiver configured to receive a receiver signal (S3). Said transmitter/receiver arrangement further comprises an analogue isolator (4) connected to said antenna arrangement (5), said transmitter (19), and said receiver. Said analogue isolator (4) is adapted to route said transmitter signal (S 1) from said transmitter (19) to said antenna arrangement (5), and said incident signal (S2) from said antenna arrangement (5) to said receiver, and to isolate said transmitter signal (S1 ) from said receiver signal (S3). Said receiver is adapted to cancel any residual transmitter signa! in said receiver signal (S3) by means of at least one digital model (6, 7, 17) of at least said isolator (4), said antenna arrangement (5), and said transmitter (19).
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公开(公告)号：EP2359159A1
公开(公告)日：2011-08-24
申请号：EP08878158.8
申请日：2008-11-11
Applicant: Saab AB
Inventor： HELLSTEN, Hans
IPC: G01S13/90
CPC classification number: G01S13/9029 , G01S13/72 , G01S13/9017 , G01S13/9023
Abstract: The invention provides a method for detecting targets comprising moving and stationary targets with a radar system equipped with Synthetic Aperture Radar, SAR, on board a SAR platform, comprising navigation equipment for accurate determination of the position of the SAR platform. The SAR platform is transversing a stationary ground region and targets in the said ground region, in which the SAR platform obtains radar data by means of at least one antenna. The radar system further comprises a SAR processor recording the radar data and the position of the antenna or antennas for each transmitted radar pulse. Wherein radar data within synthetic sub-apertures, are : successively merged in Niteration steps into SAR images of increasing resolution of the surveyed region and where each iteration step consists of forming a new SAR image at a new iteration level by a linear combination of neighbouring SAR images in the previous iteration step. The invention also provides a corresponding radar system and a SAR processor is further used for calculating the detection and positioning of targets comprising moving and stationary targets.
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