Sensors
NPOESS ATMS Overview

ATMS Channel Characteristics
Channel	Center Freq.(GHz)	Polarization	Max Bandwidth(GHz)	Temperature Sensitivity(K) NE∆T	Calibration Accuracy	Static Bandwidth (degrees)	Characterization At Nadir
1	23.8	V	0.27	0.9	2.0	5.2	window-water vapor 100 mm
2	31.4	V	0.18	0.9	2.0	5.2	window-water vapor 500 mm
3	50.3	H	0.18	1.20	1.5	2.2	window-surface emissivity
4	51.76	H	0.40	0.75	1.5	2.2	window-surface emissivity
5	52.8	H	0.40	0.75	1.5	2.2	surface air
6	53.596±0.115	H	0.17	0.75	1.5	2.2	4 km ~ 700 mb
7	54.40	H	0.40	0.75	1.5	2.2	9 km ~ 400 mb
8	54.94	H	0.40	0.75	1.5	2.2	11 km ~ 250 mb
9	55.50	H	0.33	0.75	1.5	2.2	13 km ~ 180 mb
10	57.2903	H	0.33	0.75	1.5	2.2	17 km ~ 90 mb
11	57.2903±0.115	H	0.078	1.20	1.5	2.2	19 km ~ 50 mb
12	57.2903	H	0.036	1.20	1.5	2.2	25 km ~ 25 mb
13	57.2903±0.322	H	0.016	1.50	1.5	2.2	29 km ~ 10 mb
14	57.2903±0.322±0.010	H	0.008	2.40	1.5	2.2	32 km ~ 6 mb
15	57.2903±0.322±0.004	H	0.003	3.60	1.5	2.2	37 km ~ 3 mb
16	87-91(88.20)	V	2.0	0.5	2.0	2.2	window H O 150 mm
17	165.5	H	3.0	0.6	2.0	1.1	H₂O 18 mm
18	183.31±7	H	2.0	0.8	2.0	1.1	H₂O 18 mm
19	183.31±4.5	H	2.0	0.8	2.0	1.1	H₂O 4.5 mm
20	183.31±3	H	1.0	0.8	2.0	1.1	H₂O 2.5 mm
21	183.31±1.8	H	1.0	0.8	2.0	1.1	H₂O 1.2 mm
22	183.31±1.0	H	0.5	0.9	2.0	1.1	H₂O 0.5 mm

ATMS Technical Performance Measure
Key Parameter	Spec Value	Projection	Basis
Cal Accuracy(K)	<0.75	<0.41	Analysis, with partial measurements validation
Nonlinearity(K)	<0.10	<0.088	Wost-case EDU measurement + analysis
Beam Efficiency(%)	>95	>95	Analysis, with partial measurement validation
Freq. Stability(MHz)	<0.50	0.45	Measurement + analysis
Pointing Knowl.(deg)	<0.05	0.044	Analysis
Mass (kg)	<85	75.4	Measurement
Power (W)	<110	91.0	Measurement
Data rate(kbps)	<30	28.9	Measurement
Reliability	>0.86	0.88	Analysis