Large tuning range chirp signal generating method and device

Abstract

Provided are a large tuning range chirp signal generating method and device. The method comprises: in a large signal modulation mode, utilizing an electrooptical modulator to perform electrooptical modulation on the optical carrier wave outputted by a tunable light source and the radiofrequency signal outputted by a radio frequency local oscillator to obtain a dual wavelength optical signal; modulating the optical signal through a wavelength separation and polarization reuse module to generates an orthogonal polarization dual wavelength optical signal; employing the orthogonal polarization dual wavelength optical signal as an optical carrier wave to be inputted into a polarization modulator and to perform electro-optical modulation with a parabola waveform excitation signal; and generating a chirp signal through a detector beat frequency, and adjusting a tunable light source output wavelength and a radio frequency local oscillator output frequency to perform carrier frequency tuning on a generated chirp signal. The chirp signal generated in the scheme has the advantages of great stability, high carrier frequency, large tuning range, reconstructible waveform, etc., and can be applied widely in future.

Description

technical field [0001] The invention belongs to the technical field of microwave photon signal generation, and in particular relates to a method and a device for generating a chirp signal with a carrier frequency having a large tuning range. Background technique [0002] Chirp signal is one of the most commonly used radar signal forms. It has a large time-width bandwidth product, which can improve the measurement accuracy and resolution of radar distance and speed at the same time. On the other hand, chirp signal has excellent pulse compression Features, can improve the range and measurement accuracy of the radar at the same time. With the continuous development of technology, the functional requirements of radar equipment are getting higher and higher, especially in the field of military combat, it is urgent to improve the "four resistance" capabilities of radar such as anti-electronic interference, anti-stealth, anti-low-altitude penetration, and anti-radiation missiles. ...

AI Technical Summary

Problems solved by technology

[0005]However, the above solution has certain limitations

In the schemes 1) and 2), it is necessary to filter out optical signals of different wavelengths, and then modulate one of them. The system is a separate structure, and the stability of the output signal is very poor; 3) and 4) overcome the system stability problem, However, polarization selective devices are wavelength dependent, so the carrier frequency tuning performance of the generated signal is very limited

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