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Multioctave and reconfigurable frequency-stepped radar waveform generation based on an optical frequency shifting

Yamei Zhang, Ce Liu, Kunlin Shao

|April 3, 2020

Summary

A novel photonic method generates reconfigurable frequency-stepped radar waveforms using an optical frequency shifting loop (OFSL). This technique allows for flexible control over frequency intervals and hopping periods for advanced radar applications.

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Area of Science:

Photonics
Radar Systems Engineering
Optical Signal Processing

Background:

Traditional radar waveform generation methods face limitations in flexibility and bandwidth.
Photonic approaches offer potential for overcoming these limitations due to light's high frequency.
Optical frequency shifting loops (OFSL) are emerging as a key technology for optical signal manipulation.

Purpose of the Study:

To propose and demonstrate a photonic method for generating multioctave and reconfigurable frequency-stepped radar waveforms.
To experimentally validate the reconfigurability of frequency intervals and hopping periods.
To explore the potential of OFSL for advanced radar waveform generation.

Main Methods:

A photonic method based on an optical frequency shifting loop (OFSL) was designed.
Rectangular optical pulses were applied to the OFSL to generate frequency-stepped optical signals.
Beating the optical signal with a continuous-wave optical carrier produced electrical frequency-stepped waveforms.

Main Results:

Successful generation of frequency-stepped signals with intervals of 1, 3, 5, 8, and 10 GHz.
Demonstrated reconfigurability of the frequency-hopping period, achieving values of 189, 10.2, 5.1, and 2.42 ns.
Experimental validation confirmed the proposed method's effectiveness and flexibility.

Conclusions:

The proposed photonic method enables the generation of reconfigurable frequency-stepped radar waveforms.
The OFSL-based approach offers precise control over waveform parameters, enhancing radar capabilities.
This technique holds promise for future advancements in radar systems requiring flexible and wideband waveforms.