环境减灾星座A/B 星各载荷在轨绝对辐射定标系数
1、HJ1A/B 星各载荷在轨绝对辐射定标系数见表1和表2。
表1 HJ1A/B 星CCD 与IRS 绝对辐射定标系数
定标系数
卫星
传感器
增益
参数
Band1
Band2
Band3 Band4
a
(DN/W ⋅m −2
⋅sr −1⋅μm −1)0.57630.54100.6824 0.7209 1
L 0 (W ⋅m −2
⋅sr −1⋅μm −1)
9.31839.17587.5072 4.1484 a (DN/W ⋅m −2
⋅sr −1⋅μm −1)0.9160 0.9228 1.1277 1.0753 CCD1
2
L 0 (W ⋅m −2
⋅sr −1⋅μm −1)
7.3250
6.0737
3.6123 1.9028
a (DN/W ⋅m −2
⋅sr −1⋅μm −1)0.63600.59100.8142 0.8768 1
L 0 (W ⋅m −2
⋅sr −1⋅μm −1)
7.55757.0944 4.1319 1.2232 a (DN/W ⋅m −2
⋅sr −1⋅μm −1)0.9997 1.0016 1.3777 1.3043 HJ1A
CCD2
2
L 0 (W ⋅m −2
⋅sr −1⋅μm −1)
4.6344
4.0982
3.7360 0.7385
a (DN/W ⋅m −2
⋅sr −1⋅μm −1)0.53290.528950.68495 0.72245 1
L 0 (W ⋅m −2
⋅sr −1⋅μm −1)
1.6146
4.0052
6.2193 2.8302
a (DN/W ⋅m −2
⋅sr −1⋅μm −1)0.86850.9367
1.2433 1.3002
CCD1
2
L 0 (W ⋅m −2
⋅sr −1⋅μm −1)
3.0089
4.4487 3.2144 2.5609
a (DN/W ⋅m −2
⋅sr −1⋅μm −1)
0.57820.50870.6825 0.6468 1
L 0 (W ⋅m −2
⋅sr −1⋅μm −1)
3.4608 5.8769 8.0069 8.8583 a (DN/W ⋅m −2
⋅sr −1⋅μm −1)0.9076 0.8502 1.1635 0.9800 CCD2
2
L 0 (W ⋅m −2
⋅sr −1⋅μm −1)
2.2219
4.0683
5.2537
6.3497
g (DN/W ⋅m −2
⋅sr −1⋅μm −1)
4.285718.557912.662 61.472
HJ1B IRS 1
b (DN)
- - 11.489 -44.598
表2 HJ1A 星HSI 绝对辐射定标系数（DN/W ⋅m −2⋅sr −1⋅μm −1）
HJ1AHSI 绝对定标系数
波长
定标系数
波长
定标系数
波长
定标系数
460.04 0.2927 561.88 1.5462 721.61 5.8620
462.14 0.3050 565.00 1.5896 726.77 5.1258 464.25 0.3447 568.16 1.6073 732.01 5.5057 466.38 0.3786 571.36 1.6783 737.33 4.3242
468.53 0.4018 574.60 1.5987 742.73 4.1700
470.71 0.4296 577.87 1.6443 748.20 3.9960
472.90 0.4713 581.18 1.7071 753.75 3.9403
475.11 0.5059 584.52 1.7016 759.39 3.8426
477.35 0.5022 587.90 1.7869 765.11 11.5210
479.60 0.5239 591.33 1.9722 770.92 4.5856
481.88 0.6020 594.79 2.0156 776.82 4.0644
484.18 0.6329 598.30 1.9759 782.81 4.1707
486.50 0.7557 601.85 1.9553 788.89 4.4275
488.84 0.7367 605.44 1.9843 795.07 4.6644
491.20 0.7456 609.07 2.0150 801.34 4.6438
493.59 0.8194 612.74 2.1141 807.72 4.5858
496.00 0.7721 616.46 2.2630 814.20 4.9406
498.44 0.8276 620.23 2.1945 820.78 6.4526
500.90 0.8993 624.04 2.1912 827.47 5.5252
503.38 0.9542 627.90 2.3906 834.27 5.3826
505.89 0.9832 631.81 2.4263 841.18 4.5829
508.42 1.0366 635.76 2.4634 848.20 4.3767
510.98 1.0400 639.77 2.4562 855.35 4.4874
513.56 1.0333 643.82 2.5488 862.62 4.2436
516.17 1.1463 647.93 2.7137 870.01 4.3057
518.81 1.1874 652.09 2.9064 877.53 4.1998
521.48 1.1288 656.31 2.9426 885.18 4.1541
524.17 1.1658 660.58 2.9840 892.96 4.0919
526.89 1.2008 664.90 2.8501 900.89 5.7221
529.64 1.2321 669.29 2.9618 908.95 5.6478
532.42 1.2460 673.73 3.0574 917.16 6.2722
535.22 1.3309 678.23 3.0978 925.52 4.7639
538.06 1.2698 682.79 3.1684 934.04 7.7071
540.92 1.4228 687.41 3.4454 942.71 12.8335
543.82 1.3548 692.10 4.3658 951.54 10.0017
546.75 1.3759 696.85 3.9148
549.71 1.4898 701.66 3.8392
552.70 1.4741 706.54 3.8968
555.73 1.4915 711.50 3.7569
558.79 1.5827 716.52 3.7909
2、对于CCD相机，增益2状态的定标系数中除HJ1BCCD1的系数为场地替代定标获取，其余3个CCD相机的定标系数是通过实验室定标系数得到的增益1和增益2定标系数转换关系所得。利用绝对定标系数将DN值图像转换为辐亮度图像的公式为L=DN/a + L0
式中L为辐亮度，a为绝对定标系数增益，L0为偏移量，转换后辐亮度单位为W⋅m−2⋅sr−1⋅μm−1。
