空间目标事件相机探测能力分析  

Analysis of Detection Capability of Space Target Based on Event Camera

作　　者：吕媛媛 刘朝晖[1,3] 乔文龙 周亮[1,3] 孙笑敩[1,2,3] 陈沛权 李文凯 张海洋 LV Yuanyuan;LIU Zhaohui;QIAO Wenlong;ZHOU Liang;SUN Xiaoxiao;CHEN Peiquan;LI Wenkai;ZHANG Haiyang(Xi′an Institute of Optics and Precision Mechanics of CAS,Xi′an 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Space Precision Measurement Technology,Chinese Academy of Sciences,Xi′an 710119,China)

机构地区：[1]中国科学院西安光学精密机械研究所,西安710119 [2]中国科学院大学,北京100049 [3]中国科学院空间精密测量技术重点实验室,西安710119

出　　处：《光子学报》2023年第2期173-184,共12页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61805275)。

摘　　要：建立了事件相机空间目标探测灵敏度模型,分析了影响事件相机观测灵敏度的影响因素,得到了可观测极限星等与阈值的线性关系,并通过望远镜进行了外场观星实验。结果表明事件相机可以进行空间目标探测,同时验证了空间目标探测灵敏度模型的准确性。进一步明确了阈值对事件相机空间目标探测的影响,为基于事件相机的空间目标观测及其他相关研究提供了理论基础。Event cameras are increasingly popular in the field of artificial vision systems as a new type of biological vision sensor.Different from traditional detectors,which capture images at a fixed rate,event cameras are inspired by biological retinas and respond asynchronously and independently to changes in the brightness of each pixel in the scene.The pixel unit independently detects the change range of the logarithmic value of the light intensity.When it exceeds the preset threshold,the pixel unit is activated and reads out the relevant information of this activation through an external unit,generally including the position of the pixel,activation time,polarity,and other information.When read out,these information are packaged into a data packet,which is called an“event”.After the event is output,the photosensitive pixel unit will return to the inactive state and re-monitor the changes in the outside light intensity.This working principle makes event cameras offer attractive properties compared to traditional cameras:large dynamic range(140 dB vs.60 dB),high temporal resolution(in the order ofμs),low latency,low power consumption,and high pixel bandwidth(in the order of kHz)resulting in reduced motion blur.Hence,Event cameras are widely used in spatial vision problems such as pose estimation,3D reconstruction,and SLAM.With the development of the event camera,it has been gradually applied in the field of space target detection,and has shown great potential.Event cameras provide a new solution for monitoring satellites and stars for space situational awareness.However,there are few research on space situational awareness based on event cameras.Aiming at the problem of space target detection based on event cameras,we clarify the mechanism of event camera for space target observation,and systematically analyze the influencing factors that affect the detection sensitivity of space target based on event camera.Apart from theoretical analysis,we also build a detection sensitivity model of space target based on event

关 键 词：生物视觉传感器 事件相机 空间目标观测 灵敏度 星等 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]