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Center Independent Research & Development: JPL IRAD

Adaptive EMI Mitigation for Enhanced Spacecraft Telecom (Adaptive EMI Mitigation)

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Project Introduction

Almost all of the science data from NASA's Mars rovers is returned via a relay link from the surface to a Mars Orbiter.  For operational simplicity these relay links use omni directional antennas.  This setup leaves telecom systems suceptible to RF interference emenating from near by science payloads and spacecraft subsystems that can decrease link performance by a factor of 2 or more.  Most of this interference appears as Fourier overtones of switching power supplies, data lines, clocks, and stepper motors.  

Most of the self-generated Electromagnetic interference (EMI) on a spacecraft appears as Fourier overtones of switching power supplies, data lines, clocks, and stepper motors.  These EMI tones are relatively stable in frequency, but the complement of EMI tones can vary as the spacecraft operating mode is changed.  The Adaptive EMI Mitigation study is developing computationally efficient algorithms to characterize and eliminate major tone interference that otherwise degrades the performance of data return from the planetary surface to relay orbiters overhead.

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