Analysis of signal-to-noise ratio for space-based optical surveillance of asteroids

λ/ $μ m$	$c f$
$0.36$	$1.37 \times 10^{- 8}$
$0.44$	$2.17 \times 10^{- 8}$
$0.502 \pm 0.012$	$1.55 \times 10^{- 8}$
$0.530 \pm 0.003 5$	$1.33 \times 10^{- 8}$
$0.55$	$1.18 \times 10^{- 8}$
$0.64$	$7.40 \times 10^{- 9}$
$0.70$	$5.70 \times 10^{- 9}$
$0.79$	$4.02 \times 10^{- 9}$
$0.90$	$2.73 \times 10^{- 9}$
$1.25$	$9.89 \times 10^{- 10}$
$1.65$	$3.69 \times 10^{- 10}$
$2.2$	$1.29 \times 10^{- 10}$
$3.5$	$2.26 \times 10^{- 11}$
$3.8$	$1.60 \times 10^{- 11}$
$4.8$	$6.50 \times 10^{- 12}$
$8.4$	$8.09 \times 10^{- 13}$
$10$	$3.94 \times 10^{- 13}$
$10.6$	$3.15 \times 10^{- 13}$
$12$	$1.91 \times 10^{- 13}$
$20$	$2.56 \times 10^{- 14}$
$21$	$2.10 \times 10^{- 14}$
$25$	$1.06 \times 10^{- 14}$

Table 2. Orbital elements of target asteroid
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Table 2. Orbital elements of target asteroid
$a / A U$ $e$ $i / (°)$ $Ω / (°)$ $ω / (°)$ $F / (°)$
1 0.05 10 10 30 165

Table 3. Physical parameters of target asteroid
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Table 3. Physical parameters of target asteroid
参　数数　值
温度 $T_{o b j}$ /K $300$
发射率 $ε$ $0.9$
反照率 $α$ $0.142$
直径 $D$ /m $100$

Table 4. Performance parameters of telescope
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Table 4. Performance parameters of telescope
参　数数　值
口径 $D_{0}$ /m $0.7$
焦距 $f$ /m $5$
光学透过率 $τ_{o p t}$ $0.8$

Table 5. Performance parameters of detector

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Table 5. Performance parameters of detector

参　数	数　值
光电增益 $G$	$1$
量子效率η	$0.7$
图像帧数 $N$	$1$
暗电流 $N_{D}$ /（e^-·s^-1·pixel^-1）	$0.6$
读出噪声 $N_{R}$	$0.35 e^{-} R M S @ 500 k H z$
逆增益 $G_{I}$	$10^{5} / 2^{14}$
工作波段 $λ$ /nm	$380 - 800$
像元尺寸 $a$ /μm	$10$
积分时间 $t_{i n t}$ /s	$10$

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Xin-tao WANG, Jian-hua ZHENG, Ming-tao LI. Analysis of signal-to-noise ratio for space-based optical surveillance of asteroids[J]. Optics and Precision Engineering, 2021, 29(12): 2763

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