JOINT TIME-FREQUENCY ANALYSIS OF RADAR MICRO-DOPPLER SIGNATURES FROM AIRCRAFT ENGINE MODELS

Abstract

Micro-Doppler signatures from four CAD aircraft engine models and one experimental engine model are analyzed using joint time-frequency analysis (JTFA). The signatures are obtained from shooting and bouncing rays (SBR) simulation for the CAD models and from measurement for the experimental model. The JTFA results give additional useful physical feature information regarding the respective engines, such as whether the number of blades is odd or even and the length of blades, in addition to the number of blades, which can be extracted by traditional spectrum analysis.