Maneuvering imaging quality of space TDI push scan optical remote sensor

Table 1. Camera parameters
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Table 1. Camera parameters
Parameters name Result
Camera focus/mm 1120
Pixel size B1-B8：28 P：7
Orbit height/km 782
Roll angle/(°) [−30,30]
Pitch angle/(°) [−25,+25]

Table 2. Camera field of different bands

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Table 2. Camera field of different bands

Band	Field/(°)
Band	0	+2.24	−2.24
B1	（+123.65，0）	（+123.65，+43.8）	（+123.65，−43.8）
B4	（+129.78，0）	（+129.78，+43.8）	（+129.78，−43.8）
B6	（+133.56，0）	（+133.56，+43.8）	（+133.56，−43.8）
B8	（+137.31，0）	（+137.31，+43.8）	（+137.31，−43.8）
B2	（+123.65，0）	（+123.65，+43.8）	（+123.65，−43.8）
B3	（+127.77，0）	（+127.77，+43.8）	（+127.77，−43.8）
B5	（+131.55，0）	（+131.55，+43.8）	（+131.55，−43.8）
B7	（+134.65，0）	（+134.65，+43.8）	（+134.65，−43.8）
P	（+137.76，0）	（+137.76，+43.8）	（+137.76，−43.8）

Table 3. GSD of different fields in B1 spectrum band

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Table 3. GSD of different fields in B1 spectrum band

Roll angle/(°)	GSD of B1@0 field/m
	Pitch angle/(°)
	−20	−15	−10	−5	0	5	10	15	20
0	20.83	19.98	19.53	19.45	19.72	20.37	21.45	23.06	25.38
10	21.2	20.33	19.87	19.78	20.06	20.73	21.84	23.49	25.87
20	22.39	21.45	20.96	20.87	21.17	21.88	23.08	24.87	27.46
30	24.69	23.61	23.04	22.94	23.28	24.1	25.49	27.58	30.62
Roll angle/(°)	GSD of B1@+2.24° field/m
	Pitch angle/(°)
	−20	−15	−10	−5	0	5	10	15	20
0	20.85	20	19.55	19.46	19.73	20.38	21.47	23.09	25.4
10	21.41	20.52	20.05	19.96	20.24	20.92	22.05	23.75	26.19
20	22.84	21.85	21.33	21.23	21.54	22.28	23.54	25.43	28.16
30	25.51	24.33	23.7	23.58	23.94	24.83	26.32	28.59	31.93
Roll angle/(°)	GSD of B1@−2.24° field/m
	Pitch angle/(°)
	−20	−15	−10	−5	0	5	10	15	20
0	20.85	20	19.55	19.46	19.73	20.38	21.47	23.09	25.4
10	21.03	20.18	19.73	19.65	19.92	20.58	21.67	23.29	25.61
20	22	21.11	20.64	20.55	20.84	21.53	22.68	24.4	26.86
30	23.98	22.99	22.46	22.37	22.69	23.47	24.76	26.69	29.49

Table 4. GSD of different fields in P spectrum band

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Table 4. GSD of different fields in P spectrum band

Roll angle/(°)	GSD of P@0 field/m
	Pitch angle/(°)
	−20	−15	−10	−5	0	5	10	15	20
0	5.16	4.97	4.87	4.86	4.94	5.12	5.4	5.83	6.44
10	5.25	5.05	4.95	4.94	5.03	5.21	5.5	5.94	6.56
20	5.55	5.33	5.22	5.21	5.3	5.5	5.82	6.29	6.97
30	6.12	5.87	5.74	5.73	5.83	6.06	6.43	6.98	7.78
Roll angle/(°)	GSD of P@+2.24 field/m
	Pitch angle/(°)
	−20	−15	−20	−5	−20	5	−20	15	−20
0	5.17	4.97	4.87	4.86	4.94	5.12	5.41	5.83	6.44
10	5.31	5.1	5	4.99	5.07	5.25	5.56	6	6.64
20	5.66	5.43	5.31	5.3	5.4	5.6	5.93	6.43	7.15
30	6.32	6.04	5.91	5.89	6	6.24	6.64	7.24	8.12
Roll angle/(°)	GSD of P@−2.24 field/m
	Pitch angle/(°)
	−20	−15	−20	−5	−20	5	−20	15	−20
0	5.17	4.97	4.87	4.86	4.94	5.12	5.41	5.83	6.44
10	5.21	5.02	4.92	4.91	4.99	5.17	5.46	5.88	6.49
20	5.45	5.25	5.14	5.14	5.22	5.41	5.71	6.17	6.81
30	5.94	5.71	5.6	5.59	5.69	5.9	6.24	6.75	7.48

Table 5. MTF of different fields in B1 spectrum band

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Table 5. MTF of different fields in B1 spectrum band

Roll angle/(°)	MTF of 0° field（TDI stage=60）
	Pitch angle/(°)
	−20	−15	−10	−5	0	5	10	15	20
0	0.894	0.950	0.985	1.000	0.994	0.968	0.918	0.841	0.730
10	0.893	0.950	0.985	1.000	0.994	0.967	0.916	0.838	0.725
20	0.889	0.949	0.985	1.000	0.993	0.965	0.912	0.829	0.710
30	0.881	0.945	0.984	1.000	0.992	0.961	0.902	0.809	0.674
Roll angle/(°)	MTF of +2.24° field（TDI stage=60）
	Pitch angle/(°)
	−20	−15	−10	−5	0	5	10	15	20
0	0.869	0.934	0.976	0.997	0.998	0.978	0.936	0.867	0.766
10	0.556	0.692	0.799	0.878	0.935	0.972	0.993	1.000	0.993
20	0.141	0.314	0.466	0.589	0.685	0.754	0.803	0.835	0.851
30	0	0	0.041	0.161	0.255	0.314	0.333	0.310	0.238
Roll angle/(°)	MTF of −2.24° field（TDI stage=60）
	Pitch angle/(°)
	−20	−15	−10	−5	0	5	10	15	20
0	0.869	0.934	0.976	0.997	0.998	0.978	0.936	0.867	0.766
10	0.999	0.997	0.980	0.944	0.886	0.802	0.685	0.532	0.340
20	0.892	0.853	0.797	0.718	0.611	0.473	0.303	0.109	0
30	0.510	0.484	0.424	0.332	0.208	0.060	0	0	0

Table 6. MTF of different fields in P spectrum band

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Table 6. MTF of different fields in P spectrum band

Roll angle/(°)	MTF of 0° field（TDI stage=60）
	Pitch angle/(°)
	−20	−15	−20	−5	−20	5	−20	15	−20
0	1	1	1	1	1	1	1	1	1
10	1	1	1	1	1	1	1	1	1
20	1	1	1	1	1	1	1	1	1
30	1	1	1	1	1	1	1	1	1
Roll angle/(°)	MTF of +2.24° field（TDI stage=60）
	Pitch angle/(°)
	−20	−15	−20	−5	−20	5	−20	15	−20
0	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000
10	0.977	0.980	0.982	0.983	0.982	0.980	0.977	0.972	0.964
20	0.909	0.922	0.929	0.931	0.929	0.921	0.908	0.885	0.850
30	0.766	0.800	0.819	0.825	0.818	0.798	0.761	0.700	0.606
Roll angle/(°)	MTF of −2.24° field（TDI stage=60）
	Pitch angle/(°)
	−20	−15	−20	−5	−20	5	−20	15	−20
0	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000
10	0.986	0.988	0.989	0.989	0.989	0.988	0.985	0.982	0.976
20	0.932	0.941	0.946	0.948	0.946	0.940	0.930	0.913	0.887
30	0.820	0.844	0.858	0.862	0.857	0.841	0.813	0.768	0.699

Table 7. Radiance variation between target and background with different roll angles

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Table 7. Radiance variation between target and background with different roll angles

Radiance name		Roll angle=0°	Roll angle=30°
注：表中，图像背景调制度=（目标总辐亮度−目标大气程辐亮度−目标邻近像元辐亮度）/（背景总辐亮度+目标总辐亮度）
Background	Aero radiance/W·m⁻²·sr⁻¹	12.521	19.328
	Adjacent pixel radiance/W·m⁻²·sr⁻¹	7.868	8.942
	Total radiance/W·m⁻²·sr⁻¹	59.045	64.521
Target	Aero radiance/W·m⁻²·sr⁻¹	12.521	19.328
	Adjacent pixel radiance/W·m⁻²·sr⁻¹	7.856	8.932
	Total radiance/W·m⁻²·sr⁻¹	39.704	46.385
Modulation		0.196	0.164

Table 8. Pitch and side angles with different imaging modes(Unit: (°))

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Table 8. Pitch and side angles with different imaging modes(Unit: (°))

View mode	Side angle	Pitch angle	Sun elevation	Sun azimuth	Satellite zenith	Satellite azimuth
注：正向俯仰指相机视轴在XOZ平面投影在第一象限，即卫星降交点成像时向南俯仰；反向俯仰指相机视轴在XOZ平面投影在第二象限，即卫星降交点成像时向北俯仰；无俯仰指俯仰角度小于1°
Forward pitch	13.39	30.39	62.75	162	32.95	−13.52
No pitch	13.16	0.27	62.8	162.85	13.16	98.00
Backwark pitch	13.40	−30.01	62.9	163.3	32.61	29.83

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Qiaoping Wang, Wenwen Qi, Wei Tan. Maneuvering imaging quality of space TDI push scan optical remote sensor[J]. Infrared and Laser Engineering, 2022, 51(10): 20220094

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