The Thirteenth Israeli Mini-Workshop in Applied
and Computational Mathematics
Ari Abramson (Elbit Systems)
Reduction of Multiple Harmonics EM Noise in Helicopter Cockpit
A helmet-mounted display (HMD) is a device used to project information on an
aircrew's visor. By using a line-of-sight (LOS) tracker, the HMD allows the
pilot to obtain situational awareness and receive flight mission
information, and weapon targeting symbology. A common technology for
tracking the pilot's LOS is based on a narrow-band electromagnetic (EM)
field transmitted in the cockpit. However, a high energy EM interference
which may be emitted within the cockpit, may degrade dramatically the
tracker performance. We present a method for reducing noise in HMD tracking
system, in which the interfering noise is results from two different
harmonic sources with different time-varying basic frequencies. The
reduction algorithm is based on Fourier series analysis. Implementing the
proposed algorithm in HMD system for combat helicopters shows a significant
reduction in noise harmonics and improved LOS performance.
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