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公开(公告)号：US4562439A
公开(公告)日：1985-12-31
申请号：US449102
申请日：1982-12-13
申请人： Eduardo J. Peralta , Kay M. Reitz
发明人： Eduardo J. Peralta , Kay M. Reitz
摘要： An imaging radar seeker (8) for producing two-dimensional images of a target (2) is mounted on a missile (6) or other moving body, such as an automobile. A computer (40) directs the seeker (8) to operate sequentially in searching, tracking, and imaging modes. In the searching mode, a combination of circumferential rotation of antenna (12) of seeker (8) and frequency scanning of electromagnetic energy fed to antenna (12) enables seeker (8) to search for its target (2) over a conical field-of-view (16) or a wider, peripheral belt field-of-view (16). In the imaging mode, circumferential rotation of antenna (12) is stopped, and the tilt angle (A) of the linear array (32) of antenna (12) is stepped or continuously moved to compensate for radial movement of the radiated beam (14) caused by frequency stepping imparted by a frequency synthesizer (20). This keeps the beam (14) fixed in space and centered on target (2). Inverse synthetic aperture imaging is used to create a two-dimensional image (4) of target (2) wherein the first dimension (range) is obtained by performing inverse Fourier transforms on the echo signals, and the second orthogonal dimension (cross-range or doppler frequency) is obtained by performing Fourier transforms. Array (32) can be a linear array of E-plane stacked linear waveguide antenna elements (38) operating in either the traveling wave mode or the standing wave mode.
摘要翻译： 用于产生目标（2）的二维图像的成像雷达探测器（8）安装在诸如汽车的导弹（6）或其它移动体上。 计算机（40）引导寻找器（8）在搜索，跟踪和成像模式中依次操作。 在搜索模式中，引导器（8）的天线（12）的圆周旋转和馈送到天线（12）的电磁能的频率扫描的组合使得寻轨器（8）能够在锥形场 - （16）或更宽的外围皮带视野（16）。 在成像模式中，天线（12）的周向旋转停止，天线（12）的直线阵列（32）的倾斜角（A）被阶梯状或连续移动以补偿辐射束（14）的径向运动 ）由频率合成器（20）赋予的频率步长引起。 这样就可以将光束（14）固定在空间中并以目标（2）为中心。 反向合成孔径成像用于创建目标（2）的二维图像（4），其中第一维度（范围）是通过对回波信号进行逆傅里叶变换而得到的，第二维度（范围） 多普勒频率）通过执行傅里叶变换获得。 阵列（32）可以是以行波模式或驻波模式工作的E平面堆叠线性波导天线元件（38）的线性阵列。
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