Propeller Modulation Equalization via Reference Tones

TL;DR

This paper introduces a method to mitigate propeller-induced Doppler effects in RF signals using reference tones, enhancing the accuracy of drone-based RF inspections in navigation systems.

Contribution

It presents a novel equalization technique employing reference tones to reduce propeller modulation effects on RF signals, improving signal integrity in drone inspections.

Findings

Significant reduction in Doppler spread with the proposed method

Effective under various propeller speeds

Improved signal accuracy in simulations

Abstract

Propeller modulation, also known as micro-Doppler modulation, presents a significant challenge in radio frequency (RF) inspection operations conducted via drones. This paper investigates the equalization of propeller modulation effects on RF signals, specifically targeting applications in navigation aids such as Instrument Landing Systems (ILS). By employing a continuous reference tone, the propeller-induced Doppler spread can be effectively captured and equalized, improving signal integrity and accuracy. Simulation results demonstrate that the proposed equalization method significantly reduces DDM deviation caused by propeller modulation, even under various propeller speeds. The findings suggest that incorporating such equalization techniques can enhance the reliability and efficiency of drone-based RF inspections.