Passive millimeter-wave camera with interferometric processing
Passive millimeter-wave camera with interferometric processing
复制标题
具有干涉处理功能的无源毫米波相机
DOI：
10.1117/12.666550
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
O. Kujubu
中科院分区：
文献类型：
--
作者：
H. Nohmi;S. Ohnishi;O. Kujubu
研制了一台具有干涉处理功能的被动毫米波相机样机。目的是验证干涉毫米波相机的可行性，并研究毫米波图像的特性。本文介绍了毫米波干涉相机的工作原理和特点。同时给出了系统的硬件结构和图像处理算法。这种原型相机是由最低配置的干涉成像仪，其中包括两套W波段前端与喇叭天线，接收器，A/D转换器，高速处理硬件和计算机。这两个天线的位置与W波段前端移动的精密线性滑块上的水平和垂直轴。在硬件处理器中数字化和处理相干放大的双通道信号。该过程包括相位误差补偿、各轴数据的所有组合的相关和积分以提高信噪比。计算机输入积分数据，经匹配滤波处理后生成图像。积分时间为1 mS至10 S，具体取决于所需的积分增益。最大合成天线口径为水平轴1 m，垂直轴50 cm。由于移动天线的接收需要一定的时间，所以该样机只对没有运动的目标成像。将显示处理后的图像。此外，未来计划的实时相机使用这种技术。
A proto-type passive millimeter-wave (MMW) camera with interferometric processing has been developed. The purpose is to confirm the feasibility of the interferometric MMW camera and to study the characteristics of MMW images. In this paper, the principle and the feature of the interferometric MMW camera is described. Also, the hardware configuration and the image processing algorithm are presented. This proto-type camera is comprised of the minimum configuration as an interferometric imager which consists of two sets of a W-band front end with a horn antenna, a receiver, and an A/D converter, a high-speed processing hardware, and a computer. The position of these two antennas with W-band front-end moves on the precision linear slider in horizontal and vertical axis. The coherently amplified two channel signals are digitized and processed in the hardware processor. The process is comprised of phase error compensation, correlation of all combination of each axis data, and integration to improve the signal to noise ratio. The computer input the integrated data to make an image by matched filter processing. The integration time is from 1mS to 10S depending on required integration gain. The maximum synthesized antenna aperture size is 1m for horizontal axis and 50cm for vertical axis. Because it takes certain time to receive by the moving antennas, only the targets without motion are imaged by this proto-type camera. The processed images will be shown. Also, future plan for a real-time camera using this technique is presented.