Microwave photon radar detection method and system based on photon sampling and coherent receiving

Abstract

The invention discloses a microwave photon radar detection method and system based on optical sampling and coherent reception, and the method comprises the steps: modulating optical pulse signals in two polarization states, which are inputted into a polarization multiplexing electro-optical modulator, through a baseband signal and a target echo signal; obtaining a polarization multiplexing optical signal comprising the first transmitting sampling optical signal and the first receiving sampling optical signal; after the polarization state of the polarization multiplexing optical signal is separated, respectively obtaining a second transmitting sampling optical signal and a second receiving sampling optical signal, wherein the second transmitting sampling optical signal is divided into two paths, after one path is subjected to photoelectric conversion, a radar transmitting signal is obtained, and the other path and the received sampling optical signal are sent into a 90-degree optical coupler and are subjected to balanced photoelectric detection to obtain two orthogonal intermediate frequency signals, and the intermediate frequency signals are processed to obtain detection target information. Through the photon sampling technology and the photon coherent receiving technology, reconfigurable radar signal generation and coherent receiving can be achieved, and the radar system is compact, simple and high in anti-interference capacity.

Description

technical field [0001] The invention relates to a radar detection method, in particular to a microwave photon radar detection method and system using photon sampling and photon coherent receiving technologies. Background technique [0002] High-frequency, broadband, high-precision, real-time, multi-functional full-spectrum detection is the main direction 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, when the generation, sampling, and processing of broadband signals are directly realized in the microwave domain, there are potential amplitude / phase nonlinear effects, and the microwave amplification and matching links are complicated, which limits the application of radar to high-frequency broadband. Development (see [S.Kim, ...

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Problems solved by technology

In applications that require phase information, it cannot meet the requirements

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