Spectrum Localization and Hough Transform-Based β Tuning for LSS Targets’ Accurate Micro-Doppler Imaging System
Harish Chandra Kumawat, Arockia Bazil Raj A, Piotr Samczyński
Abstract
In this work, we present the accurate micro-Doppler (m-D) imaging of behaviors of simultaneous operation of multiple low-altitude, smaller-size, and slowly-flying (LSS) targets. A C-band (5.3 GHz) continuous wave (CW) radar is indigenously designed and used to acquire the m-D signatures. A new spectrum localisation and Hough transform based bandwidth (β) tuning algorithm is proposed to generate the accurate time-frequency (T-F) images based on the acquired LSS targets’ non-stationary, linear, non-linear, rotational, translational, and orbital-/oscillatory-motion multi-component m-D signatures. In order to practically validate this claim, several realistic open-field experiments are conducted operating four different LSS targets: (i) a flapping bionic bird, (ii) a three-blades and (iii) a two-blades; rotational systems, and (iv) a cone-like translational system, at different ranges in front of the developed radar. The results associated with these experiments and the findings are reported and analysed.