Buccaneer Risk Mitigation Mission

JORN

BRMM

Buccy

On-orbit Calibration of Magnetometer Using Stochastic

Gradient Descent

SSC19-WKII-02Joshua Abbey

All comments are mine and do not represent DST Group

Why?

AIT

Learn like a Neural Net

How?

Gradient Descent

Buccaneer Telemetry

Training the calibration parameters

• Loss = 0.5*(WMM Prediction – Calibration Prediction)^2

• Gains -= LR * dLoss/dGains

• Biases -= LR * dLoss/dBiases

What?

On Ground Testing – Analytical vs SGD

On Ground Testing – NLLS vs SGD

On Orbit Testing – Magnetic Field Strength

On Orbit Testing – Error between Sun and Mag Vectors

On Orbit Testing – Magnetic Field Strength Error

On Orbit Testing – Angular Difference

Improvements

So What?

Thanks!