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Nonlinear error correction for Terahertz FMCW System by a new beat frequency estimation method.

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    Area of Science:

    • Nondestructive testing
    • Terahertz technology
    • Signal processing

    Background:

    • Nonlinearity in Terahertz (THz) frequency modulated continuous wave (FMCW) systems degrades range resolution and causes distance-measuring errors.
    • Existing correction methods often require extra hardware or extensive computation, hindering system miniaturization and real-time applications.

    Purpose of the Study:

    • To propose and demonstrate a novel method for correcting nonlinear errors in THz FMCW technology.
    • To enhance range resolution and accuracy in THz FMCW nondestructive testing.

    Main Methods:

    • Utilizing the windowed Fourier transform (WFT) to estimate the beat frequency (BF) based on voltage-controlled oscillator (VCO) linearity.
    • Calculating nonlinear compensation coefficients from the estimated BF of a reference target.
    • Calibrating the output BF signal using the derived compensation coefficients.

    Main Results:

    • Accurate estimation of the target's BF from a nonlinear signal.
    • Successful calibration of output BF signal nonlinearity.
    • Achieving range resolution at the theoretical limit in simulations and experiments.

    Conclusions:

    • The proposed method effectively corrects nonlinear errors in THz FMCW systems.
    • This approach enables high-precision nondestructive testing with improved range resolution.
    • The method supports the development of smaller, real-time THz FMCW systems.