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    This study introduces a novel method for generating high-frequency, phase-coded microwave pulse trains using an actively mode-locked optoelectronic parametric oscillator (AML-OEPO). This technique enhances radar capabilities by improving both unambiguous detection range and ranging resolution.

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    Area of Science:

    • Optoelectronics
    • Microwave Engineering
    • Signal Processing

    Background:

    • Generating phase-coded coherent microwave pulse trains is crucial for advanced radar systems.
    • Existing methods face challenges in balancing unambiguous detection range and ranging resolution.

    Purpose of the Study:

    • To propose and demonstrate a new approach for generating high-frequency, phase-coded coherent microwave pulse trains.
    • To utilize an actively mode-locked optoelectronic parametric oscillator (AML-OEPO) for this purpose.

    Main Methods:

    • An electrical mixer was integrated into an optoelectronic oscillator (OEO) cavity for active mode-locking and parametric oscillation.
    • A low-frequency sinusoidal signal with voltage polarity coding drove the mixer, synchronized with the OEO's free spectral range (FSR) and loop delay.
    • Phase-coded microwave pulse trains were generated with pulse intervals equal to the loop delay and coding periods as multiples of the loop delay.

    Main Results:

    • Successfully generated phase-coded microwave pulse trains at 15.026 GHz using 13-bit Barker codes and 7-bit M-codes.
    • Demonstrated high coherence, evidenced by a high peak-to-sidelobe ratio in the autocorrelation of 13-bit Barker coded pulse trains.
    • The method effectively enhances signal period and coherence, addressing the range-resolution trade-off.

    Conclusions:

    • The AML-OEPO approach provides an effective method for generating high-frequency, phase-coded coherent microwave pulse trains.
    • This technique offers significant advantages for radar applications by improving unambiguous detection range and ranging resolution.
    • The demonstrated high coherence validates the potential of this method for advanced signal processing.