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NPOESS Instruments - CrIMSS
The Cross-track Infrared Sounder (CrIS) combined with the Advanced Technology Microwave Sounder (ATMS) globally produces atmospheric temperature, moisture and pressure profiles from space. CrIS and ATMS
(CrIMSS) are the next generation operational sensor suite selected
to fly on the National Polar-orbiting Operational Environmental Satellite System
(NPOESS) spacecraft. Combining both cross-track infrared and microwave
sensors aboard the NPOESS satellite
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CrIMSS Instrument |
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provides key Environmental Data Records (EDRs) CrIMSS will operationally produce high vertical resolution
profile measurements of temperature, water vapor, and pressure. In addition to providing operational temperature, moisture, and pressure
profiles, CrIMSS has the potential to provide other surface and atmo- spheric science data, including total ozone and
sea surface temperature. ATMS provides high spatial resolution microwave data to
support temperature and humidity sounding generation in cloud covered
conditions. In addition, ATMS provides advances in technology that allow the
current operational temperature and moisture microwave sounder components to be
packaged in one sensor with less total weight, power, and volume.
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CrIMSS Mission Products
Primary Temperature profiles
- Moisture profiles
- Pressure profiles
- Calibrated radiances
Secondary Total ozone
- Sea surface temperature
- Cloud top parameters
- Precipitable water
- ERB products
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Infared Image
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CrIS Functions |
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CrIS Instrument Characteristics
| Spectral Range |
LWIR Band
MWIR Band
SWIR Band
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650-1095 cm-1
1210-1750 cm-1
2155-2550 cm-1
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| Spectral Resolution |
LWIR Band
MWIR Band
SWIR Band
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<0.625cm-1
<1.25cm-1
<2.50cm-1
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Registration
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Band-to-Band Co-registration
FOV Jitter
Mapping accuracy
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<1.4%
<50 urad/axis
<1.5 km
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| Field-of-View (FOV) |
# of FOV
FOV Diameter (round)
FOV shape match
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3X3
14 km
<0.05%
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| Stability |
Radiometric
Spectral:
Spectral shift errors
Mass
Power
Data rate
Size
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<.4%LW, <.5%MW, <.65SW
ILS <1% of FWHM
<5 ppm
87 kg
91 W
1.5 mbps
70X45X47
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| Artist's concept of ATMS Instrument |
ATMS Instrument Characteristics
| Parameter |
Requirement |
CPE |
Performance |
Margin |
| NET (K) |
 0.50 to 3.60 |
0.30 to 3.60 |
0.18 to 2.71 |
> 14% |
Calibration Accuracy (K)
Ch. 1, 2
Ch. 3-15
Ch. 16-22 |
2.0
1.5
2.0
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1.0
0.75
1.0
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0.61K
0.38K
0.39K
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1.39
1.12
1.61
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| Beam efficiency (%) |
 95 |
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97 to 99 |
> 2 |
| Frequency stability (MHz) |
0.5 to 200 |
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< 0.13 to 195. |
0.37 |
| Pointing knowledge (degrees) |
0.05 |
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0.044 |
0.006 |
| Beamwidth variability (%) |
10 |
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< 4 |
6 |
| Reliability (P) |
0.86, 0.76
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-----, 0.83 |
0.8904, 0.8866 |
0.0304, 0.1266 |
| Dimensions (cm) |
70 x 60 x 40 |
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64.9 |
1.1 |
| Mass (kg) * |
66 |
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64.9 |
1.1 |
| Power (W) |
85 |
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84.5 |
0.5 |
| Data rate (kbps) |
50 |
30 |
24.3 |
25.7 |
| * 30 MHz for channels 18-21 |
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About NPOESS