Study of imaging radar using ultra-wideband microwave-modulated infrared laser
Study of imaging radar using ultra-wideband microwave-modulated infrared laser
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DOI：
10.1117/12.2236326
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
A. Mase;Y. Kogi;H. Ikezi;M. Inutake;Xiaolong Wang
中科院分区：
文献类型：
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作者：
A. Mase;Y. Kogi;H. Ikezi;M. Inutake;Xiaolong Wang
本文介绍了一种超宽带微波调制激光雷达，它是为了提高距离向和方位向的空间分辨率而设计和制造的。对波长为1550 nm的红外激光光源进行了0.01-18 GHz的幅度调制。频率和带宽由日本内务通信省无线电管理局分配。然而，在红外区没有带宽限制。考虑到微波天线辐射方向图的影响，激光束的传输不存在旁瓣。可以抑制从地面返回的模糊信号和干扰。利用光纤准直器作为发射和接收光学元件，制作了激光雷达系统的样机。使用矢量网络分析仪获得微波调制输入与接收信号之间的S21信号。该系统首先应用于物体距离(位置)的测量。实验证明，在5-10m的范围内，空间分辨率小于1 cm。作为初步实验，我们成功地对一束激光进行了二维扫描，获得了物体的三维图像。
In this paper, we present an ultra-wideband microwave-modulated laser radar which is designed and fabricated for improvement of the spatial resolution both in the range direction and the azimuth direction. The amplitude modulation in a range of 0.01-18 GHz is applied to an infrared laser source of 1550 nm wavelength. The frequency and the bandwidth are assigned by the Administration of Radio under the Ministry of Internal Affairs and Communications in Japan. However, there is no bandwidth limitation in the infrared region. Considering the influence of radiation pattern for microwave antennas case, there is no side lobe in laser beam transmission. Ambiguous signal and interferences which are returned from the ground can be suppressed. A prototype of laser-radar system with a fiber collimator for both transmitting and receiving optics has been fabricated. A vector network analyzer is used to obtain S21 signal between the microwave modulation input and that of received signal. The system is, at first, applied to the measurement of the distance (position) of an object. It is proved that the spatial resolution is less than 1 cm during 5-10 m. As an initial experiment, we have succeeded to obtain 3D image of object by scanning a laser beam in two dimensions.