Abstract
We present an automatic framework combined space-time signal processing with Time Reversal electromagnetic (EM) inversion for subsurface and through-wall multitarget imaging using electromagnetic waves. This framework is composed of a frequency-wavenumber (FK) filter to suppress direct wave and medium bounce, a FK migration algorithm to automatically estimate the number of targets and identify target regions, which can be used to reduce the computational complexity of the following imaging algorithm, and a EM inversion algorithm using Time Reversal Multiple Signal Classification (TR-MUSIC) to reconstruct hidden objects. The feasibility of the framework is demonstrated with simulated data generated by GPRMAX.
Highlights
Electromagnetic waves play a significant role in subsurface and through-wall imaging (TWI) due to their strong penetrability
Automatically estimate the number of targets and identify target regions, which can be used to reduce the computational complexity of the following imaging algorithm
This paper has presented an automatic framework combined space-time signal processing techniques with TR-MUSIC algorithm for subsurface and through-wall multitarget imaging using electromagnetic waves
Summary
Electromagnetic waves play a significant role in subsurface and through-wall imaging (TWI) due to their strong penetrability. The nonlinear inverse scattering algorithms can perform a quantitative reconstruction of the hidden targets, which are still limited to implement in practical applications due to its iterative computation making it very time-consuming [7] Aiming to this problem, the linear inverse scattering algorithms have been proposed to implement the detection and imaging of the hidden object. Linearized inversion schemes based on diffraction tomography, which require much less computational efforts, are well suited for in practical applications since they can be implemented with fast Fourier transform [8] These imaging algorithms have not described the preprocessing step, nor have taken into account the multiple targets scenario. International Journal of Antennas and Propagation there is a need to adopt some appropriate data processing techniques to suppress the interference signal and enhance the reflected wave from the target.
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