Radar imaging

Interference (communication)

Algorithm

Engineering

Frequency domain

Fast Fourier transform

Telecommunications

Electromagnetic interference

Computer science

Acoustics

Interpolation (computer graphics)

Short-time Fourier transform

Physics

Mathematics

Fourier analysis

Electronic engineering

Mathematical analysis

Channel (broadcasting)

Radar

Continuous-wave radar

Beat (acoustics)

Fourier transform

Pulse-Doppler radar

Computer vision

Frame (networking)

IEEE Transactions on Microwave Theory and Techniques

A frequency-modulated continuous-wave (FMCW) radar interference mitigation technique using the interpolation of beat frequencies in the short-time Fourier transform (STFT) domain, phase matching, and reconfigurable linear prediction coefficients estimation for Coherent Processing Interval processing is proposed. The technique is noniterative and does not rely on algorithm convergence. It allows the usage of the fast Fourier transform (FFT) as the radar's beat-frequency estimation tool, for reasons such as real-time implementation, noise linearity after the FFT, and compatibility with legacy receiver architectures. Verification is done in range and in range-Doppler using radar experimental data in two ways: first by removing interferences from interference-contaminated data and second by using interference-free data as the reference data, and processing it-as if it had interferences-using the proposed technique, inverse cosine windowing and zeroing for comparison. We found that processing with the proposed technique closely matches the reference-data and outperforms the inverse cosine windowing and zeroing techniques in 2-D cross correlation, amplitude, and phase average errors and phase root-mean-square error. It is expected that the proposed technique will be operationally deployed on the TU Delft simultaneous-polarimetric PARSAX radar.

An Interference Mitigation Technique for FMCW Radar Using Beat-Frequencies Interpolation in the STFT Domain