Ground Preprocessing Technical Innovation of BJ-3A/B Satellites Active Forward and Reverse Push-Broom Agile Imaging

指标名称	BJ-3A	BJ-3B
分辨率（星下点）	全色：0.5 m；多光谱：2 m	全色：优于0.5 m；多光谱：1.2 m
幅宽（星下点）	优于23 km（双相机刈幅）	优于11 km
全色谱段	0.45~0.70 μm	0.45~0.90 μm
多光谱谱段	蓝：0.45~0.52 μm绿：0.52~0.59 μm红：0.63~0.69 μm近红外：0.77~0.89 μm	蓝：0.45~0.52 μm绿：0.52~0.59 μm红：0.63~0.69 μm近红外：0.77~0.89 μm
量化位数	12 bit	11 bit

Table 2. Attitude angle variation information for the 7-strip mosaic imaging of the BJ-3B satellite

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Table 2. Attitude angle variation information for the 7-strip mosaic imaging of the BJ-3B satellite

条带号	成像时长/s	起止侧摆角/(°)	变化量/(°)	起止俯仰角/(°)	变化量/(°)	起止偏航角/(°)	变化量/(°)
1-正扫	7.5	[−8.13, −7.23]	0.90	[24.59, 24.56]	0.03	[−9.06, −9.06]	0.00
2-反扫	7.5	[−6.06, −6.40]	0.34	[20.91, 12.67]	8.24	[−8.75, −8.24]	0.51
3-正扫	7.5	[−5.16, −4.23]	0.93	[8.69, 8.59]	0.10	[−8.09, −8.11]	0.02
4-反扫	7.5	[−3.01, −3.33]	0.32	[3.96, −5.07]	9.03	[−8.04, −8.02]	0.02
5-正扫	7.5	[−2.06, −1.13]	0.93	[−9.19, −9.31]	0.12	[−8.13, −8.16]	0.03
6-反扫	7.5	[0.11, −0.22]	0.11	[−13.74, −21.80]	8.06	[−8.36, −8.83]	0.47
7-正扫	7.5	[1.03, 1.95]	0.92	[−25.18, −25.26]	0.08	[−9.18, −9.22]	0.04

Table 3. Changes of line time of the BJ-3B satellite each stripe image

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Table 3. Changes of line time of the BJ-3B satellite each stripe image

条带号	成像档位	最小行时/μs	最大行时/μs	变化量/μs
1-正扫	5	54.400 00	54.500 00	0.100 0
2-反扫	5	46.433 33	51.633 33	5.200 0
3-正扫	5	44.866 67	44.933 33	0.066 7
4-反扫	5	43.800 00	44.233 33	0.433 3
5-正扫	5	44.966 67	44.966 67	0.000 0
6-反扫	5	46.366 67	51.800 00	5.433 3
7-正扫	5	54.700 00	54.733 33	0.033 3

Table 4. TDI level and gain of BJ-3B satellite panchromatic camera
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Table 4. TDI level and gain of BJ-3B satellite panchromatic camera
相机档位太阳高度角/(°) 全色TDI级数增益/dB
0 128级 5
1 128级 5
2 [0, 24] 128级 2
3 (24, 34] 112级 0
4 (34, 45] 80级 0
5 (45, 90] 56级 0
6 40级 0
7 28级 0

Table 5. Statistics of plane accuracy measurement
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Table 5. Statistics of plane accuracy measurement
条带号正反扫检查点个数/个最小较差/m 最大较差/m 中误差/m
1 正扫 105 0.06 1.79 0.77
2 反扫 73 0.02 2.98 1.57
3 正扫 147 0.04 1.89 0.64
4 反扫 89 0.19 2.83 1.19
5 正扫 116 0.02 1.59 0.65

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Ming YAN, Zhiyong WANG, Junchao GENG, Ling LI, Peng AI, Guozhu SUN, Chun WEI. Ground Preprocessing Technical Innovation of BJ-3A/B Satellites Active Forward and Reverse Push-Broom Agile Imaging[J]. Spacecraft Recovery & Remote Sensing, 2025, 46(3): 22

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