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Polar Coordinates: Problem Solving01:27

Polar Coordinates: Problem Solving

Directional radiation patterns are central to antenna analysis, as they illustrate how signal strength varies with direction. These patterns are often modeled using polar plots, where the radial distance from the origin represents signal intensity at a given angle. A commonly used idealized form is the four-lobed rose curve, which captures the concept of directional beams in a simplified mathematical form.The four-lobed rose curve, described by r = cos⁡(2θ), features four symmetric lobes, each...

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Optimal cross-polarization spatial-depth matrix for millimeter-wave concealed threat detection by using polarization,

Heyao Wang, Ziran Zhao, Lingbo Qiao

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    This study introduces a new millimeter-wave (MMW) security screening method using cross-polarization. It effectively detects concealed threats by analyzing echo power differences, offering a simpler, more flexible alternative to imaging.

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    Area of Science:

    • Applied Physics
    • Electromagnetics
    • Security Technology

    Background:

    • Active millimeter-wave (MMW) technology is used in personnel security screening.
    • Current MMW systems do not fully utilize polarization information for threat detection.

    Purpose of the Study:

    • To develop a direct detection method for concealed threats using only cross-polarization power information.
    • To enhance MMW security screening flexibility and system simplicity.

    Main Methods:

    • A direct detection method analyzing cross-polarization echo power without phase information.
    • Derivation of a spatial-depth matrix using inverse Fourier transform and spatial scanning.
    • Optimization of cross-polarization angle for enhanced contrast.
    • Establishment of quantitative discrimination criteria: standard deviation of spatial spectrum gradient (SDSSG) and depth spectrum peaks (SDDSP).

    Main Results:

    • The spatial-depth matrix effectively characterizes target spatial and depth distributions.
    • Optimized cross-polarization angle improves contrast between threats and the human body.
    • SDSSG and SDDSP showed significant changes (>50% and >157%, respectively) for concealed threats compared to normal individuals.

    Conclusions:

    • The proposed method enables effective concealed threat detection through thresholding SDSSG and SDDSP.
    • This approach offers potential for higher flexibility and simpler system architecture than imaging techniques.