公开(公告)号：US20100033367A1

公开(公告)日：2010-02-11

申请号：US12517327

申请日：2006-12-11

申请人： Hans Hellsten ,  Lars Ulander ,  Patrik Dammert

发明人： Hans Hellsten ,  Lars Ulander ,  Patrik Dammert

IPC分类号： G01S13/90

CPC分类号： G01S13/9035

摘要： A radar system comprising a platform movable along a path in relation to a ground surface portion and carrying a positioning device, a timing device and a radar equipment. It is adapted to implement synthetic aperture radar (SAR) for imaging the ground portion. It includes recording means for collecting radar raw data comprising radar echo amplitudes annotated with distance and the moment of time of collection and being intertwined with platform position measurement data annotated with the respective moment of time of collection thereof.

摘要翻译： 一种雷达系统，包括可沿相对于地面部分的路径移动的平台，并承载定位装置，定时装置和雷达装置。 它适用于实现用于成像地面部分的合成孔径雷达（SAR）。 它包括用于收集雷达原始数据的记录装置，其包括用距离注明的雷达回波幅度和收集时间，并与其收集时间的各个时刻注释的平台位置测量数据相互交织。

公开(公告)号：US06518914B1

公开(公告)日：2003-02-11

申请号：US09703621

申请日：2000-11-02

申请人： Mats Peterson ,  Hans Hellsten ,  Lars Ulander

发明人： Mats Peterson ,  Hans Hellsten ,  Lars Ulander

IPC分类号： G01S1390

CPC分类号： G01S13/5244 ,  G01S13/9029 ,  G01S13/9035

摘要： A Synthetic Aperture Radar (SAR) system and method capable of detecting moving targets which includes a platform that moves over a number of objects, such as a ground surface, and supports radar equipment which reproduces the objects by means of a fast backprojection synthetic aperture technique via at least two antennas without requirement as to directivity or fractional bandwidth. The imaging process is divided into three steps which are carried out in a determined order, the steps and the order being formation of sub-aperture beams at one speed, performing clutter suppression, and detection of moving targets.

摘要翻译： 一种能够检测移动目标的合成孔径雷达（SAR）系统和方法，其包括在多个物体（例如地面）上移动的平台，并且支持通过快速反投影合成孔径技术再现物体的雷达设备 通过至少两个天线，不需要方向性或分数带宽。 成像过程分为三个步骤：以确定的顺序进行，步骤和顺序是以一个速度形成子孔径光束，执行杂波抑制和移动目标的检测。

公开(公告)号：US07884752B2

公开(公告)日：2011-02-08

申请号：US12517327

申请日：2006-12-11

申请人： Hans Hellsten ,  Lars Ulander ,  Patrik Dammert

发明人： Hans Hellsten ,  Lars Ulander ,  Patrik Dammert

IPC分类号： G01S13/00

CPC分类号： G01S13/9035

摘要： A radar system comprising a platform movable along a path in relation to a ground surface portion and carrying a positioning device, a timing device and a radar equipment. It is adapted to implement synthetic aperture radar (SAR) for imaging the ground portion. It includes recording means for collecting radar raw data comprising radar echo amplitudes annotated with distance and the moment of time of collection and being intertwined with platform position measurement data annotated with the respective moment of time of collection thereof.

摘要翻译： 一种雷达系统，包括可沿相对于地面部分的路径移动的平台，并承载定位装置，定时装置和雷达装置。 它适用于实现用于成像地面部分的合成孔径雷达（SAR）。 它包括用于收集雷达原始数据的记录装置，其包括用距离注明的雷达回波幅度和收集时间，并与其收集时间的各个时刻注释的平台位置测量数据相互交织。

公开(公告)号：US06441772B1

公开(公告)日：2002-08-27

申请号：US09857172

申请日：2001-06-18

申请人： Hans Hellsten ,  Lars Ulander

发明人： Hans Hellsten ,  Lars Ulander

IPC分类号： G01S1390

CPC分类号： G01S13/9029 ,  G01S13/90 ,  G01S13/9017

摘要： The present invention relates to a radar system which comprises a platform which moves over a number of objects. The number of objects can be very large and the objects can appear in the form of, for example, a ground surface. The platform supports radar equipment which reproduces the objects by means of synthetic aperture technique (SAR) via at least one antenna without requirements as to directivity or fractional bandwidth. Moreover, the movement of the platform is, during the recording of data for a SAR image, essentially rectilinear and uniform. The invention is characterized mainly in that it comprises a signal-processing device which records received radar echoes from each transmitted radar pulse and records or calculates the position of the used antenna or antennae, and which calculates a one-parameter quantity of two-dimensional SAR images as a function of two image co-ordinates where the parameter is the relative speed. Here use is made of the fact that each object, i.e. a radar echo with certain image co-ordinates, is reproduced at a maximum ratio of desired to undesired signal for a predetermined value of the relative speed parameter, which value is established to be the magnitude of the relative velocity vector between the object and the platform. In the calculation, the signal-processing device backprojects radar raw data in a hierarchical scheme, where each level is based only on the immediately preceding one, and where the summation of radar raw data occurs in the form of subapertures having a gradually increasing length.

摘要翻译： 雷达系统技术领域本发明涉及一种雷达系统，其包括在多个物体上移动的平台。 物体的数量可以非常大，并且物体可以以例如地面的形式出现。 该平台支持雷达设备，其通过合成孔径技术（SAR）通过至少一个天线再现物体，而不需要方向性或分数带宽。 此外，平台的运动在SAR图像的数据记录过程中基本上是直线和均匀的。 本发明的特征主要在于它包括一个信号处理装置，其记录来自每个发送的雷达脉冲的接收到的雷达回波并记录或计算所使用的天线或天线的位置，并计算二维SAR的单参数量 图像作为两个图像坐标的函数，其中参数是相对速度。 这里使用的是，对于相对速度参数的预定值，每个对象，即具有某些图像坐标的雷达回波以期望的不期望信号的最大比率被再现，该值被确定为 对象和平台之间的相对速度向量的大小。 在计算中，信号处理装置以分层方案反向处理雷达原始数据，其中每个级别仅基于前一个级别，并且其中雷达原始数据的求和以逐渐增加的子孔径的形式出现。

公开(公告)号：US06466156B1

公开(公告)日：2002-10-15

申请号：US09926075

申请日：2001-08-24

申请人： Lars Ulander

发明人： Lars Ulander

IPC分类号： G01S1390

CPC分类号： G01S13/9029

摘要： A method of detecting, by means of a SAR radar, objects that change with time within a ground area. The SAR radar is supported by a platform in essentially rectilinear motion during a synthetic aperture and the ground area is reproduced at least twice in succession from different synthetic apertures. A two-dimensional SAR image is generated from each synthetic aperture. The SAR images are matched with each other by a method in which each image position in one image is associated with the same ground area in the other image, the images being filtered, knowing location data for the antennae and based on the fact that the cylinder geometry of the SAR images is projected onto the ground surface, so that only common spectral components of the reflectivity of the ground are extracted and used in the matching.

摘要翻译： 通过SAR雷达检测在地面内随时间变化的物体的方法。 SAR雷达在合成孔径期间由基本上直线运动的平台支撑，并且地面区域从不同的合成孔径连续地再现两次。 从每个合成孔径生成二维SAR图像。 SAR图像通过一种方法彼此匹配，其中一个图像中的每个图像位置与另一图像中的相同地面区域相关联，图像被滤波，知道天线的位置数据，并且基于柱面 将SAR图像的几何形状投影到地面上，从而仅提取地面反射率的常用光谱分量并将其用于匹配。

公开(公告)号：US06384766B1

公开(公告)日：2002-05-07

申请号：US09445462

申请日：1999-12-20

申请人： Lars Ulander

发明人： Lars Ulander

IPC分类号： G01S1390

CPC分类号： G01S13/0209 ,  G01S13/90 ,  G01S13/9023 ,  G01S13/9035

摘要： The present invention relates to a method for generating a three-dimensional image of a ground area by means of a radar with a synthetic aperture, a SAR radar, which is supported by a platform moving in an essentially rectilinear manner. The method is characterized by the following steps. Advancing the platform such that at least two images of the ground are created with great difference in the angle of illumination. Transmitting radar pulses with a fractional bandwidth which is larger than or equal to 0.1, and using in the computations an aperture angle which is larger than or equal to 0.1 radians. Detecting the reflected radar pulses with amplitude and phase. For each pulse, measuring and storing the position of the antenna that transmits and the antenna that receives the pulse. Computing a two-dimensional SAR signal per synthetic aperture. Starting from the amplitude and phase of the two SAR signals as well as position data for the antennae, reconstructing a three-dimensional position description of the area relative to antenna position data.

摘要翻译： 本发明涉及一种通过具有合成孔径的雷达产生地面区域的三维图像的方法，SAR雷达由基本上以直线方式移动的平台支持。 该方法的特征在于以下步骤：移动平台，使得至少两个地面的图像被产生，具有很大的照明角度。以大于或等于0.1的分数带宽传输雷达脉冲，并且使用 在计算中，孔径角大于或等于0.1弧度。检测具有振幅和相位的反射雷达脉冲。对于每个脉冲，测量和存储发射的天线的位置和接收脉冲的天线。计算 每个合成孔径的二维SAR信号。从两个SAR信号的幅度和相位以及天线的位置数据开始，重建相对于天线位置数据的区域的三维位置描述。