Summary
International Symposium on Antennas and Propagation
2012
Session Number:POS1
Session:
Number:POS1-30
Modified HHT Analysis of Micro-Doppler Signatures Scattered from Rotating Flat Blades
Ji-Hoon Park,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
When a small reconnaissance aircraft with small radar cross section (RCS) is observed by radar, a micro-Doppler signature from its rotating propeller can be importantly used for target recognition. For extracting the feature of the target, a time-frequency analysis (TFA) is adopted as a representative method to explain the micro-Doppler characteristic. In recent years, the TFA has been applied to the various micro-Doppler signatures backscattered from rotating targets such as a helicopter rotor [1-2] and a jet engine turbine [3]. It is recommended that time-frequency transforms with higher time-frequency resolution should be employed in order to obtain more accurate and discriminative TFA results. From that point of view, Hilbert-Huang Transform (HHT) can be a good choice for analyzing micro-Doppler signatures because of its high-resolution characteristic. In this paper, we use the scattered field data obtained from the propeller modelled as multiple rotating metal flat blades [4-5]. The scattered field data was calculated based on geometrical optics (GO) and equivalent currents method (ECM). The TFA results of the micro-Doppler signatures are then presented by applying the modified form of the HHT to the data.