Stepping frequency radar based on Fourier mode-locked optoelectronic oscillator

Abstract

The invention relates to a stepping frequency radar based on a Fourier mode-locked optoelectronic oscillator. The stepping frequency radar comprises a stepping frequency signal generation module, a transmitting antenna, a receiving antenna, a stepping frequency signal demodulation module and a digital signal processing module. An output signal generated by the stepping frequency signal generation module is amplified by the first amplifier and then input to a first power divider, and one path of output signal of the first power divider is transmitted by the transmitting antenna, received by the receiving antenna, amplified by the second amplifier and then input to the stepping frequency signal demodulation module. The other path of output signal of the first power divider is directly input into a stepping frequency signal demodulation module, and the two paths of input signals are output to a digital signal processing module after being processed by the stepping frequency signal demodulation module for data processing of radar signals; the step frequency signal generation module forms an annular photoelectric oscillator resonant cavity, and can generate a low-phase noise broadband step frequency output signal when a Fourier domain mode locking condition is met.

Description

technical field [0001] The invention relates to a radar device, in particular to a step-frequency radar based on a Fourier mode-locked photoelectric oscillator. Background technique [0002] Radar is divided into pulse radar and continuous wave radar according to the radar signal waveform. Stepped frequency continuous wave radar (SFCW) adopts single-frequency stepped continuous wave, which requires less restriction on working bandwidth, and synthesizes wider bandwidth with smaller instantaneous bandwidth to obtain high distance resolution. Stepped frequency continuous wave radar is widely used in ground penetration, micro-deformation monitoring, battlefield surveillance, life detection, vehicle collision avoidance and other fields. [0003] Thanks to the development of modern frequency synthesis technology, the commonly used step frequency signal generation technologies mainly include phase-locked loop frequency synthesis technology, direct digital frequency synthesis techn...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a step frequency radar based on a Fourier mode-locked photoelectric oscillator, to solve the problems of slow frequency agility of step frequency, large phase noise and poor clutter suppression ability in the existing step frequency signal generation technology question

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