红外与激光工程, 2005, 34 (1): 66, 网络出版: 2006-05-25
有源像素传感器恒星探测极限计算方法
Calculation stellardetection limit for active pixel sensor
摘要
恒星探测极限是星跟踪器的一个关键参数,在导航星库的建立和星图识别过程中起着重要作用.根据恒星辐射模型和CMOS有源像素传感器的噪声计算模型,提出了一种在给定信噪比和有源像素传感器噪声条件下,计算星跟踪器恒星探测极限的方法.该方法利用单位时间内、单位面积上有源像素传感器对0星等恒星的响应来求取恒星探测极限.最后,在信噪比为8的条件下,结合星跟踪器的有关参数给出了一个计算恒星探测极限的具体实例.
Abstract
The stellar detection limit(SDL) of image sensor is a key parameter of star tracker. It plays an important role in the selection of guide stars and the star pattern identification. In order to calculate the SDL of CMOS active pixel sensor (APS), the model of star influx and the noise model of APS are presented. The main noise sources of APS are analyzed. If SNR and total noise of APS are given, the SDL of APS can be calculated based on the typical response of 0 magnitude visual star per second per mm2. As an example, a specific SDL of APS is provided with given optical parameters and exposure time.
张晨, 沈绪榜, 陈朝阳. 有源像素传感器恒星探测极限计算方法[J]. 红外与激光工程, 2005, 34(1): 66. 张晨, 沈绪榜, 陈朝阳. Calculation stellardetection limit for active pixel sensor[J]. Infrared and Laser Engineering, 2005, 34(1): 66.