Coherent microwave photon radar detection method and system based on injection locking frequency multiplication

Abstract

The invention discloses a coherent microwave photon radar detection method and system based on injection locking frequency doubling. The method uses a baseband signal to modulate an optical carrier to generate a modulated optical signal comprising a plurality of high-order sidebands; the modulated optical signal is divided into two paths which are respectively injected into two slave lasers for high-order sideband injection locking to obtain two locked sideband optical signals; one locking sideband optical signal is selected to be divided into two paths, one path serves as a receiving optical signal to receive radar echoes to obtain a radar receiving optical signal, and the other path is combined with the other locking sideband optical signal to be divided into two paths, wherein one path is subjected to photoelectric conversion to obtain a frequency multiplication radar transmitting signal, and the other path and a radar receiving optical signal realize coherent receiving of a radar echo signal, an intermediate frequency signal is obtained, and extraction is carried out to obtain detection target information. Through the photon injection locking technology and the photon coherent receiving technology, frequency doubling reconfigurable radar signal generation and coherent receiving can be achieved, radar system parameters are flexible and adjustable, and the anti-interference capability is high.

Description

technical field [0001] The invention relates to a radar detection method, in particular to a microwave photon radar detection method and system based on optical injection locking frequency multiplication and coherent reception. Background technique [0002] Real-time high-precision radar is widely used in military and civilian fields, and multi-functional full-spectrum detection is one of the main directions of the development of modern radar technology. In order to cover the wide-area spectrum space, this requires the radar working band to be flexible and adjustable, and the signal can be processed and analyzed with high precision in real time. Limited by the bottleneck of current electronic technology, radio frequency amplification, matching, and transmission links have potential amplitude / phase nonlinear effects when carrying functions such as broadband signal generation, sampling, and processing, which limits the development of radar to high-frequency broadband ( See [S...

AI Technical Summary

Problems solved by technology

However, the current wideband radar signal generation scheme based on photon frequency multiplication technology has the following problems: 1) The frequency multiplication factor of optical frequency multiplication based on a special modulator is limited and cannot be flexibly adjusted; 2) The photoelectric control link is complex and there are strong The spurious interference signal generated by the non-ideal sideband beat frequency; 3) The signal generation method limits the radar signal reception scheme. Most of the radar signal reception schemes are difficult to achieve the reception of broadband target echo signals through coherent reception.

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