Analysis of the atmospheric multi-angle polarimetric radiometer for aerial remote sensing and its test experiments

Fig. 2. Schematic diagram of a single group of 3-band optical path of radiometer main body with orthogonal scanning mirror

Fig. 3. Particle spectral distributions of two aerosols

Fig. 4. Variation of total aerosol DFS with the number of detection angles

Fig. 5. Variation of posterior relative error of aerosol column concentration retrieval with number of detection angles

Fig. 6. Variation of posterior relative error of aerosol column concentration retrieval with polarized measurement accuracy

Fig. 7. Variation of posterior relative error of aerosol column concentration retrieval with radiation measurement accuracy

Fig. 8. Physical picture of AMPR and its aerial flight experiment scene

Fig. 9. Aerosol AOD inversion results in the 665 nm waveband acquired by AMPR on the flight path

Table 1. Main specifications of AMPR

Table 1. Main specifications of AMPR

名称	指标
中心波长/nm	490，555，665，865，960，1640
带宽/nm	20~60
瞬时视场（IFOV）	17 mrad
扫描范围/（°）	沿飞行方向扫描最大角度范围：-55°~+55°，采样间隔1°
偏振检测方向/（°）	线偏振，4方向：0°，45°，90°，135°
探测器	双元Si Pin探测器（<1 100 nm）双元InGaAs探测器（>1 100 nm）
量化精度	12 bits
工作方式	沿飞行方向扫描
绝对辐射定标不确定度	优于4%
偏振测量精度	优于0.5%

Table 2. Verification results of polarization measurement accuracy of AMPR with low gain state

Table 2. Verification results of polarization measurement accuracy of AMPR with low gain state

波段与玻片调整角度	490 nm				555 nm				665 mm
波段与玻片调整角度	10°	20°	40°	60°	10°	20°	40°	60°	10°	20°	40°	60°
理论值（标准偏振发生器输出偏振度）	0.7	2.88	13.17	35.33	0.69	2.85	13.06	35.09	0.68	2.82	12.93	34.82
测量值	0.62	2.73	12.76	34.69	0.68	2.79	12.92	35.33	0.56	2.68	12.77	34.65
偏差	-0.08	-0.15	-0.41	-0.64	-0.01	-0.06	-0.14	0.24	-0.12	-0.14	-0.16	-0.17
平均偏差	0.32				0.11				0.14
波段与玻片调整角度	865 nm				960 nm				1 640 nm
波段与玻片调整角度	10°	20°	40°	60°	10°	20°	40°	60°	10°	20°	40°	60°
理论值（标准偏振发生器输出偏振度）	0.67	2.79	12.8	34.53	0.67	2.79	12.78	34.48	0.66	2.73	12.52	33.9
测量值	0.46	2.55	12.63	34.79	0.48	2.54	12.51	34.23	0.47	2.55	12.42	34.38
偏差	-0.21	-0.24	-0.17	0.26	-0.19	-0.25	-0.27	-0.25	-0.18	-0.18	-0.1	0.48
平均偏差	0.22				0.24				0.24

Table 3. Absolute radiometric calibration uncertainty results of AMPR with low gain state

Table 3. Absolute radiometric calibration uncertainty results of AMPR with low gain state

波段/nm	不确定性因素及贡献			合成标准不确定度/%
波段/nm	标准灯－漫反射参考板定标系统的不确定度/%	AMPR响应的非线性/%	AMPR响应的非稳定性/%	合成标准不确定度/%
490	3.25	0.36	0.13	3.27
555	3.25	0.28	0.21	3.26
665	3.25	0.17	0.19	3.25
865	2.73	0.28	0.07	2.74
960	2.73	1.1	0.11	2.94
1 640	3.58	0.75	0.07	3.65

Table 4. Comparison of aerosol AOD inversion results from aerial flight AMPR and ground-based CE318 solar photometer simultaneous observation experiments