1AMSR-E MOWG - September 201404/19/2023 08:52 PM

EOS Aqua

AMSR-E Performance Status

MOWG Meeting

September 23, 2014Huntsville, Alabama

Byron GravesAqua Instruments Engineer

Aqua/Aura Flight Operations Team

phone 301-614-5761

Byron.Graves@nasa.gov

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Performance Update

EOS Aqua FOT

September 24th , 2014

AMSR-E Status

3AMSR-E MOWG - September 201404/19/2023 08:52 PM

Background

• Spun-down on Oct. 4th 2011 due to excessive Torque• Sept. 19th/20th 2012, 6 trial run-up to 4rpm were conducted,

though antenna started rotation only reached around 1 rpm.

• On Dec. 4th 2012, command operation for the low speed(2rpm) rotation restart was carried out. Following fluctuations in rotation rate, the rotation became stable at 2rpm.

4AMSR-E MOWG - September 201404/19/2023 08:52 PM

Stable Rotation Calibrations

• Five gain offsets control and error flag clear have been conducted.– January 30th 2013 23GHz (H polarized wave)

– July 18th 2013 6GHz (V polarized wave) and 23 GHz (H polarized wave)

– September 6th 2013 89GHz (B-side V-polarized wave)

– February 7th 2014 6GHz (V polarized wave) and 23 GHz (H polarized wave)

– June 5th 2014 89 GHz (B-side V-polarized wave)

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Torque & CurrentFive Year Performance

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Stage III ADA Torque & Motor Current

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March PeakLowest consistent

averages since 2009

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Month of August

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Life-Time Average Temperatures

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Stage IIIRotor Temperatures

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August 2014 Averages

• Torque & Current (Averages)– ADA CMD Torque: 0.733 Nm (0.859 Nm since Stage 3 Spin-up)– ADE B Motor Current: 0.765 A (0.902 A since Stage 3 Spin-up)

• Temperatures (Averages)– Rotor A: 9.205 Deg C (10.232 C since Stage 3 Spin-up)– Rotor B: 8.740 Deg C (9.773 C since Stage 3 Spin-up)– ADE: 21.897 Deg C (22.612 C since Stage 3 Spin-up)– ADA STATOR: 9.712 Deg C (10.804 C since Stage 3 Spin-up)

All values are within nominal tolerances. Consistently lowest averages since 2009.

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