公开(公告)号：WO2018147786A1

公开(公告)日：2018-08-16

申请号：PCT/SE2018/050096

申请日：2018-02-05

Applicant: SAAB AB

Inventor： HELLSTEN, Hans ,  DAMMERT, Patrik

IPC: G01S13/93 ,  G01S13/32 ,  G01S13/91

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 notchand 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.

公开(公告)号：WO2015137853A1

公开(公告)日：2015-09-17

申请号：PCT/SE2014/050304

申请日：2014-03-12

Applicant: SAAB AB

Inventor： HELLSTEN, Hans

IPC: H01Q1/28 ,  G01S13/88 ,  H01Q7/00 ,  H01Q11/14 ,  H04B7/02

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）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。

公开(公告)号：WO2019172833A1

公开(公告)日：2019-09-12

申请号：PCT/SE2019/050205

申请日：2019-03-08

Applicant: SAAB AB

Inventor： HELLSTEN, Hans

IPC: G01S13/90 ,  G01S13/88 ,  G01V3/30 ,  H01Q21/24

Abstract: The present disclosure relates to a method for detecting a horizontally buried linear object, the horizontally buried linear object having a longitudinal extension. The method comprises moving(S10), 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 (S20) and receiving radar signals while moving along the trajectory corresponding to the synthetic aperture. The method also comprises forming (S30) a SAR image based on collected data representing radar signal reflections received from the ground. The method additionally comprises detecting (S40) 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. The present disclosure further relates to corresponding computer programs, radar systems, flying platforms and antenna systems.

公开(公告)号：WO2017069664A1

公开(公告)日：2017-04-27

申请号：PCT/SE2015/051112

申请日：2015-10-20

Applicant: SAAB AB

Inventor： HELLSTEN, Hans

IPC: G01S13/90 ,  G01S13/02

CPC classification number: G01S13/90 ,  G01S13/0209 ,  G01S13/346

Abstract: The present disclosure relates to a method for operating a broadband continuous arbitrary waveform radar system for achieving high performance notching of a predetermined number of frequencies of a first radar waveform model during transmission. The method comprises performing a first order correction of a transmit signal by iteratively obtaining an approximate solution to a minimization problem in finding the phase ripple coefficient for respective frequency to be notched by setting the remaining phase ripple coefficients to be 0 and subsequently inserting calculated phase ripple functions and phase ripple coefficients in a phase ripple radar waveform model. The present disclosure also relates to broadband continuous arbitrary waveform radar systems configured for executing said methods.

Abstract translation: 本发明涉及一种用于操作宽带连续任意波形雷达系统的方法，用于在传输期间实现第一雷达波形模型的预定数量的频率的高性能陷波。 该方法包括通过迭代地获得针对最小化问题的近似解来执行发射信号的一阶校正，以通过将剩余相位纹波系数设置为0并且随后将所计算的相位波纹 相位波纹雷达波形模型中的函数和相位纹波系数。 本公开还涉及配置用于执行所述方法的宽带连续任意波形雷达系统。

公开(公告)号：WO2011102762A1

公开(公告)日：2011-08-25

申请号：PCT/SE2010/050183

申请日：2010-02-17

Applicant: SAAB AB ,  HELLSTEN, Hans

Inventor： HELLSTEN, Hans

IPC: H04B1/40 ,  G01S7/03 ,  H04B7/015 ,  H04B7/14 ,  G01S13/42 ,  G01S13/536 ,  G01S13/58 ,  G01S13/90

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).

Abstract translation: 本发明的目的是提供一种用于发送和接收电磁波的本发明的宽带发射机/接收机装置，其中所述发射机/接收机装置包括连接到发射机（19）的数字任意波形发生器AWG（1）。 所述波形发生器（1）被配置为在给定带宽内产生任意波形。 所述发射机/接收机装置还包括配置成发射发射机信号的天线装置（5） （S1），并接收入射信号（S2），以及接收器，被配置为接收接收机信号（S3）。 所述发射机/接收机装置还包括连接到所述天线装置（5），所述发射机（19）和所述接收机的模拟隔离器（4）。 所述模拟隔离器（4）适于将所述发射机信号（S1）从所述发射器（19）传送到所述天线装置（5），并且所述入射信号（S2）从所述天线装置（5）传送到所述接收器，以及 以将所述发射机信号（S1）与所述接收机信号（S3）隔离。 所述接收机适于消除任何残留的发射机信号！ 在所述接收机信号（S3）中，通过至少所述隔离器（4），所述天线装置（5）和所述发射器（19）的至少一个数字模型（6,7,17​​）。

公开(公告)号：WO2010090564A1

公开(公告)日：2010-08-12

申请号：PCT/SE2009/050128

申请日：2009-02-06

Applicant: SAAB AB ,  HELLSTEN, Hans ,  ANDERSSON, Lars-Gunnar

Inventor： HELLSTEN, Hans ,  ANDERSSON, Lars-Gunnar

IPC: G01S13/90

CPC classification number: G01S13/90 ,  G01S13/0209 ,  G01S13/28 ,  G01S2013/9041

Abstract: The invention provides a radar system for a Synthetic Aperture Radar, SAR, comprising an arrangement of at least one transmitter, two receivers, two antennas and signal processing means located on a platform. The platform is arranged to move over ground and arranged to transmit a known signal shape and receive signals reflected from the ground. The received signals are used to produce a SAR image of the ground. The SAR image comprises a number of resolution cells. The radar system is further arranged to operate in a frequency band with a centre frequency f c and with a wide bandwidth B of at least one octave wherein the radar system comprises a first and a second antenna having a length of less than half the wavelength of the centre frequency f c . The radar system is further arranged for: • a radar system transfer function F f to be flat over the frequency band B and • one-sided beam forming with wideband antenna gain. The invention also provides a corresponding method.

Abstract translation: 本发明提供了一种用于合成孔径雷达SAR的雷达系统，其包括位于平台上的至少一个发射器，两个接收器，两个天线和信号处理装置的布置。 平台被布置成在地面上移动并布置成传递已知的信号形状并接收从地面反射的信号。 接收的信号用于产生地面的SAR图像。 SAR图像包括多个分辨率单元。 雷达系统还被布置成在具有中心频率fc并且具有至少一个八度的宽带B的频带中操作，其中雷达系统包括第一和第二天线，其长度小于 中心频率fc。 雷达系统进一步设置为：在频带B和°单侧波束形成与宽带天线增益之间的雷达系统传递函数F f是平坦的。 本发明还提供了相应的方法。

公开(公告)号：WO2021206613A1

公开(公告)日：2021-10-14

申请号：PCT/SE2021/050305

申请日：2021-04-06

Applicant: SAAB AB

Inventor： HELLSTEN, Hans

IPC: G02S13/34 ,  G02S13/58 ,  G02S7/35

Abstract: The present disclosure relates to a chirp Doppler processing method for resolving range and velocity information, the method (100) comprising the steps of determining (160) an angular beat frequency based on a Fourier transform of a formed (130) baseband signal, and determining (170) a velocity of a target based on the determined angular beat frequency. Determining (170) target velocity comprises: - forming a first quotient between complex amplitudes for a first set of time intervals and a second set of time intervals and the determined angular beat frequency, said complex amplitudes numerically calculated based on an analytical expression for the Fourier transformed baseband signal. - forming a second quotient between the analytical expression for the Fourier transformed baseband signal at the angular beat frequency for said time intervals, and - determining the target velocity by finding the velocity (v) for which the complex distance between the first quotient and the second quotient is minimized.

公开(公告)号：WO2010056159A1

公开(公告)日：2010-05-20

申请号：PCT/SE2008/051292

申请日：2008-11-11

Applicant: SAAB AB ,  HELLSTEN, Hans

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.

Abstract translation: 本发明提供了一种用于在SAR平台上配备有合成孔径雷达SAR的雷达系统来检测包括移动和固定目标的目标的方法，其包括用于准确确定SAR平台位置的导航设备。 SAR平台横跨固定的地面区域，并在所述地面区域中定位，SAR平台通过至少一个天线获取雷达数据。 雷达系统还包括一个SAR处理器，用于记录雷达数据以及每个发射的雷达脉冲的天线或天线的位置。 其中合成子孔径内的雷达数据分别是：在Niteration步骤中逐次合并到被测区域分辨率越来越高的SAR图像，其中每个迭代步骤包括通过相邻SAR的线性组合在新迭代水平上形成新的SAR图像 图像在上一个迭代步骤。 本发明还提供了相应的雷达系统，并且SAR处理器还被用于计算包括移动和静止目标的目标的检测和定位。

公开(公告)号：WO2017052422A1

公开(公告)日：2017-03-30

申请号：PCT/SE2015/050978

申请日：2015-09-21

Applicant: SAAB AB

Inventor： HELLSTEN, Hans

IPC: G01S7/41 ,  G01S13/90 ,  G06K9/62

CPC classification number: G01S7/41 ,  G01S13/90 ,  G06K9/6203 ,  G06K9/6278

Abstract: The disclosure relates to 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. 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.

Abstract translation: 本公开涉及一种用于检测图像中的至少一个目标的方法和装置，其中所述图像包括具有分配给每个像素的幅度的一组像素。 该方法包括迭代过程，直到第K + 1个目标不显示高于预定阈值的概率增加。 该方法通过创建候选空白图像，通过使用贝叶斯定理，确定候选目标K + 1在图像中的位置来确定候选空白图像，计算每个像素处存在目标的概率，确定 通过确定在确定的位置处存在目标的计算概率，在确定的位置处存在目标的概率。 通过执行上述，图像中目标的最可能位置与位置保持真实目标的概率一起定位。

公开(公告)号：WO2014098660A1

公开(公告)日：2014-06-26

申请号：PCT/SE2012/051414

申请日：2012-12-17

Applicant: SAAB AB

Inventor： HELLSTEN, Hans

IPC: G01S7/292 ,  G01S13/04

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，所述方法包括以下步骤： - 为雷达信号选择第一频率和入射角，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偏振明显大于基于采用所选择的第一频率和视角加权并差分垂直和水平偏振SAR图像的相同SAR路径的垂直和水平偏振SAR图像，使得表面后向散射完全抵消在 两个图像和目标后向散射分量的组合仍然存在。