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MiRS Sensors
SSMIS Overview

photo: SSMIS instrument

photo: SSMIS instrument

Satellite(s)

F16, F17, F18

MiRS Production Status

F16: Previously operational.
F17 & F18: Currently operational.

The Special Sensor Microwave Imager/Sounder (SSMIS) continues the legacy of passive microwave instruments carried aboard Defense Meteorological Satellite Program (DMSP) satellites. Beginning with the launch of the DMSP F-16 satellite on 18 October 2003, the SSMIS marks the commencement of a new series of passive microwave conically scanning imagers and sounders planned for launch over the next two decades (Sun and Weng 2008). SSMIS improves upon the surface and atmospheric retrievals of the Special Sensor Microwave Imager (SSM/I), and upon the atmospheric temperature and water vapor sounding capabilities of both the Special Sensor Microwave Temperature Sounder (SSM/T-1) and the Special Sensor Microwave Humidity Sounder (SSM/T-2). Furthermore, the SSMIS imaging and sounding sensors share the same viewing geometry, thereby allowing surface parameters to be retrieved simultaneously (Yan and Weng 2008). The SSMIS instrument is able to estimate atmospheric temperature, moisture, and surface parameters from data collected at frequencies ranging from 19 to 183 GHz over a swath width of 1707 km.


F16 SSMIS Sensor Characteristics
Channel Center Freq. (Ghz) Passband (Mhz) Freq. (MHz) / Polarization NEDT(Max)(K) Sampling Interval (km) Footprint (km)
1 50.3 400 10 V 0.4 37.5 38 x 38
2 52.8 400 10 V 0.4 37.5 38 x 38
3 53.596 400 10 V 0.4 37.5 38 x 38
4 54.4 400 10 V 0.4 37.5 38 x 38
5 55.5 400 10 V 0.4 37.5 38 x 38
6 57.29 350 10 RCP(*) 0.5 37.5 38 x 38
7 59.4 250 10 RCP 0.6 37.5 38 x 38
8 150 1500 200 H 0.88 37.5 14 x 13 (imager)
9 183.31±6.6 1500 200 H 1.2 37.5 14 x 13 (imager)
10 183.31±3 1000 200 H 1.0 37.5 14 x 13 (imager)
11 183.31±1 500 200 H 1.25 37.5 14 x 13 (imager)
12 19.35 400 75 H 0.7 25 73 x 47
13 19.35 400 75 V 0.7 25 73 x 47
14 22.235 400 75 V 0.7 25 73 x 47
15 37 1500 75 H 0.5 25 41 x 31
16 37 1500 75 V 0.5 25 41 x 31
17 91.655 3000 100 V 0.9 12.5 14 x 13 (imager)
18 91.655 3000 100 H 0.9 12.5 14 x 13 (imager)
19 63.283248±0.285271 3 0.08 RCP 2.4 75 75 x 75
20 60.792668±0.357892 3 0.08 RCP 2.4 75 75 x 75
21 60.792668±0.357892±0.002 6 0.08 RCP 1.8 75 75 x 75
22 60.792668±0.357892±0.006 12 0.12 RCP 1.0 75 75 x 75
23 60.792668±0.357892±0.016 32 0.34 RCP 0.6 75 75 x 75
24 60.792668±0.357892±0.050 120 0.84 RCP 0.7 37.5 75 x 75


F18 SSMIS Sensor Characteristics
(different from F16: first 5 channels are Horizontal)
Channel Center Freq. (Ghz) Passband (Mhz) Freq. (MHz) / Polarization NEDT(Max)(K) Sampling Interval (km) Footprint (km)
1 50.3 400 10 H 0.4 37.5 38 x 38
2 52.8 400 10 H 0.4 37.5 38 x 38
3 53.596 400 10 H 0.4 37.5 38 x 38
4 54.4 400 10 H 0.4 37.5 38 x 38
5 55.5 400 10 H 0.4 37.5 38 x 38
6 57.29 350 10 RCP(*) 0.5 37.5 38 x 38
7 59.4 250 10 RCP 0.6 37.5 38 x 38
8 150 1500 200 H 0.88 37.5 14 x 13 (imager)
9 183.31±6.6 1500 200 H 1.2 37.5 14 x 13 (imager)
10 183.31±3 1000 200 H 1.0 37.5 14 x 13 (imager)
11 183.31±1 500 200 H 1.25 37.5 14 x 13 (imager)
12 19.35 400 75 H 0.7 25 73 x 47
13 19.35 400 75 V 0.7 25 73 x 47
14 22.235 400 75 V 0.7 25 73 x 47
15 37 1500 75 H 0.5 25 41 x 31
16 37 1500 75 V 0.5 25 41 x 31
17 91.655 3000 100 V 0.9 12.5 14 x 13 (imager)
18 91.655 3000 100 H 0.9 12.5 14 x 13 (imager)
19 63.283248±0.285271 3 0.08 RCP 2.4 75 75 x 75
20 60.792668±0.357892 3 0.08 RCP 2.4 75 75 x 75
21 60.792668±0.357892±0.002 6 0.08 RCP 1.8 75 75 x 75
22 60.792668±0.357892±0.006 12 0.12 RCP 1.0 75 75 x 75
23 60.792668±0.357892±0.016 32 0.34 RCP 0.6 75 75 x 75
24 60.792668±0.357892±0.050 120 0.84 RCP 0.7 37.5 75 x 75

RCP - denotes right-handed circular polarization.


Source: NSIDC SSMIS page