Method for generating coherent pulse radar signal based on sweep-frequency optoelectronic oscillator

Abstract

The invention relates to a method for generating a coherent pulse radar signal based on a sweep-frequency optoelectronic oscillator, and the method comprises the steps: S1, enabling an output signal emitted by a laser to enter a Mach-Zehnder modulator, and generating a first signal; S2, injecting the first signal into a single-mode fiber through a microwave photon filtering device; S3, enabling the first signal delayed by the single-mode optical fiber to enter a photoelectric detector for beat frequency to form a second signal; S4, enabling the second signal to enter an electric amplifier to form a third signal, and enabling the third signal to enter a radio frequency input port of an electro-optical modulator to form a closed loop; in the step S1, the digital frequency synthesizer generates a first control signal and a second control signal, and the working point of the Mach-Zehnder modulator is controlled to repeatedly and transversely jump at the maximum bias point and the minimum bias point. By changing the initial phase difference of the pulse driving signal and the triangular wave signal or the wavelength of the laser, fine and large-range tuning of the center frequency of the generated broadband signal is realized.

Description

technical field [0001] The invention relates to the field of pulse radar signal generation, in particular to a method for generating coherent pulse radar signals based on frequency-sweeping photoelectric oscillators. Background technique [0002] Radar systems are widely used in all aspects of civilian and military neighborhoods, and with the development of information technology, the requirements for radar detection performance are getting higher and higher. Compared with the continuous wave radar, the pulse system radar can greatly improve the energy utilization efficiency and the detection power of the radar, while the coherent broadband pulse radar can use the amplitude and phase characteristics of the echo signal to obtain the distance of the detection target and velocity information, with good discriminative ability. Therefore, the generation of highly stable coherent pulse train signals is the key to realize the detection of multiple targets and the measurement of th...

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Problems solved by technology

[0004] For this reason, the present invention provides a coherent pulse radar signal generation method based on a frequency-sweeping photoelectric oscillator, which can solve the problem that the center frequency of the broadband signal cannot be generated by changing the initial phase difference between the pulse drive signal and the triangular wave signal or the wavelength of the laser. Technical issues with fine and wide range tuning

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