Radar signal processing method and system based on photon fractional Fourier transform

Abstract

The invention discloses a radar signal processing method, system and device based on a photon fractional Fourier transform. The method comprises the steps of: transmitting a linear frequency modulation signal to a to-be-measured target, receiving an echo signal of the to-be-measured target, and enabling the linear frequency modulation signal and the echo signal to be loaded on a single-frequency optical wave through an electro-optical modulator; respectively biasing a sub-modulator and a main modulator of the electro-optical modulator at different bias points, modulating the single-frequency optical wave through the electro-optical modulator, and outputting a modulated optical signal; converting the optical signal through a photoelectric detector to obtain a photocurrent; carrying out Fourier transform on the photocurrent to obtain a fractional Fourier spectrum, and acquiring the distance information of the to-be-measured target according to the peak position of each pulse signal in the fractional Fourier spectrum. According to the method, a high-frequency broadband radar signal can be converted into a low-frequency narrow-band fractional domain signal, and interference of a falsetarget component on a radar detection result is eliminated.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a radar signal processing method, system and device based on a photon fractional Fourier transformer. Background technique [0002] Fractional Fourier transform is one of the important means of signal processing. This method can convert the broadband non-stationary signal into a narrow-band stationary signal in the fractional domain through the time-frequency plane rotation method, so it is widely used in the fields of radar, communication, and sonar signal processing. With the development of high-precision and high-resolution radar detection, high-speed and large-capacity wireless communication, the requirements of each system for the bandwidth and center frequency of the transmitted signal are increasing. The traditional fractional Fourier transform based on electrical sampling and digital signal processing has been difficult to meet the growing demand for fast signa...

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Problems solved by technology

Therefore, in the multi-non-cooperative target scenario, due to the nonlinear effect of the modulator and photodetector, the interaction between multiple echoes will cause the appearance of false target components in the fractional domain spectrum, and the amplitude and position of the false target are related to the The real target is close and indistinguishable

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