Space Target Optical Characteristics and SNR Calculation Model on Sky Screen
Space Target Optical Characteristics and SNR Calculation Model on Sky Screen
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DOI：
10.1109/jsen.2015.2493183
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发表时间：
2016-02
影响因子：
4.3
通讯作者：
Han-shan Li
中科院分区：
文献类型：
--
作者：
Han-shan Li
为提高天幕靶测量系统的探测性能和动态目标坐标测试精度，本文提出采用离焦技术设计天幕靶的光学探测系统，研究目标空间坐标计算方法，并建立天幕靶的信噪比（SNR）计算模型。根据目标成像光斑的光照分布函数、背景光照以及光电探测接收器的光敏面尺寸，推导出输出电压计算函数和目标光学特性计算函数，分析不同背景光照下输出电压的变化规律，探讨天幕靶光学探测系统中信噪比与目标成像光斑尺寸的关系。通过计算和实验，结果发现新型天幕靶的信噪比提高了近1.4倍，验证了空间目标光学特性函数以及天幕靶信噪比计算模型的正确性和可行性。
To improve the detection performance and dynamic target coordinate testing accuracy in sky-screen measurement system, this paper proposes the out-of-focus technology to design sky-screen's optical detection system, studies the target's spatial coordinates calculation method, and sets up the signal-to-noise ratio (SNR) calculation model of sky screen. According to the illumination distribution function of target's imaging facula, the background illumination and the photosensitive surface size of the photoelectric detection receiver, the output voltage calculation function, and target optical characteristics calculation function were derived, the change regulation of the output voltage in different background illuminations was analyzed, and the relation of SNR and the target's imaging facula size in sky-screen optical detection system was discussed. Through calculation and experiment, the results find the SNR of new sky screen has increased by nearly 1.4 times, it show the space target optical characteristics function, and the SNR calculation model of sky-screen is correct and feasible.