基于激光选通成像的低噪声远距离目标识别系统  

Low Noise Remote Target Recognition System Based on Laser Sorting Imaging

作　　者：薛东彬[1] XUE Dong-bin(The 27th Research Institute of China Electronics Technology Group Corporation,Zhengzhou 450047,China)

机构地区：[1]中国电子科技集团公司第二十七研究所,郑州450047

出　　处：《电光系统》2023年第2期9-13,共5页Electronic and Electro-optical Systems

摘　　要：为了实现远距离小目标识别,开发了一套激光照明选通成像系统,通过适度的激光照明可对10km外的目标清晰成像。该系统由一组短脉冲光和一个脉冲探测器组成,光源波长1571nm,并以15Hz的频率产生20ns脉冲。探测器选用一个像素为320×256的碲镉汞二极管,其雪崩增益较高,灵敏度低至10光子rms。采用一个可提供额外的电子增益的硅基多路器执行信号发射和采集。在集成电路探封装测器中,利用成像仪执行非一致修正和灰度成像。采用雪崩碲镉汞二极管增益可达100以上,该相机成像实验表明其额外噪声、色度亮度干扰及非一致性非常小。采用固态焦平面排列技术使得成像呈现出较高的空间分辨率。通过实验室和外场试验可以看出,该成像方式已被用来探测激光照射目标的特性和改变系统模式。This paper has introduced a laser-illuminated,gated imaging system for long range target identification which has generated bright images at ranges in excess of 10km from modest laser energies.The system is based on a short pulse width laser and a custom detector for sensing the return pulse.The source is a converted by an optical parametric oscillator(OPO)to 1571nm and producing 20 ns pulses at 15 Hz.The detector is a 320×256 array of HgCdTe photodiodes operating with high avalanche gain to achieve sensitivities as low as 10 photon rms.A custom silicon multiplexer performs the signal injection and temporal gating function,and adds additional electronic gain.The detector is encapsulated in an integrated-detector-cooler-assembly and utilizes standard productionised thermal imaging electronics to perform non-uniformity correction and grey scale images.Imaging trials using the camera have shown little excess noise,crosstalk or non-uniformity due to the use of avalanching in the HgCdTe photodiodes up to gains of over 100.The images have shown high spatial resolution arising from the use of solid state focal plane array technology.The imaging method,collected both in the laboratory and in field trials,has been used to explore the phenomenology unique to laser-illuminated targets and to verify system models.

关 键 词：光电雷达 激光雷达 主动成像 雪崩光电二极管 3D成像 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]