Classification of Electronic Devices Using a Frequency-Swept Harmonic Radar Approach

Abstract

A new method to classify electronic devices using a Frequency-Swept Harmonic Radar (FSHR) approach is proposed in this paper. The FSHR approach enables us to utilize the frequency diversity of the harmonic responses of the electronic circuits. Unlike previous studies, a frequency-swept signal with a constant power is transmitted to Electronic Circuits Under Test (ECUTs). The harmonic response to a frequency-swept transmitted signal is found to be distinguishable for different types of ECUTs. Statistical and Fourier features of the harmonic responses are derived for classification. Later, the harmonic characteristics of the ECUTs are depicted in 3D harmonic and feature spaces for classification. Three-dimensional harmonic and feature spaces are composed of the first three harmonics of the re-radiated signal and the statistical or Fourier features, respectively. We extensively evaluate the performance of our novel method through Monte Carlo simulations in the presence of noise.

Design of harmonic radar based on dual-transmitter and dual-receiver mechanism

“…The signal system of harmonic radar can be divided into point-frequency signals and broadband signals, with broadband signals including frequency-stepped and chirped signals. When the radar emits a signal with frequency f, the electromagnetic wave reaches the target, the target captures and re-radiates the electromagnetic wave energy, and the re-radiated electromagnetic wave is the harmonic and combined wave components of the fundamental wave [11]. The frequency of the harmonic radar's transmitted signal is f 1 , and the frequency of the received signal is 2 f 1 , 3 f 1 …Only certain specific objects, namely those with nonlinear voltage-current characteristics, can radiate harmonics, typically electronic targets with PN junctions and targets with metal nodes.PN junctions mainly produce second-harmonic signals, while metal nodes mainly produce third-harmonic signals.…”