MIMO radar detection method and device based on double optical frequency combs and difference frequency multiplexing

Abstract

The invention discloses an MIMO radar detection method based on double optical frequency combs and difference frequency multiplexing. According to the method, an existing MIMO radar detection technology based on microwave photon orthogonal difference frequency multiplexing is improved, and M paths of modulated optical signals of a transmitting end are generated through the following method: firstly, an optical carrier is divided into an upper path and a lower path; The local oscillator signal is used for carrying out modulation processing on the uplink optical carrier wave to generate a firstoptical frequency comb signal, and the intermediate frequency signal and the intermediate frequency linear frequency modulation signal are used for carrying out modulation processing on the next optical carrier wave to generate a second optical frequency comb signal; After the first optical frequency comb signal and the second optical frequency comb signal are coupled into one path, the first optical frequency comb signal and the second optical frequency comb signal are divided into M paths of modulated optical signals respectively consisting of a single intermediate frequency linear frequencymodulation spectrum line and a single local oscillator signal spectrum line through beam shaping filtering. The invention also discloses an MIMO radar detection device based on the double optical frequency combs and the difference frequency multiplexing. According to the invention, the structure of the transmitter can be greatly simplified, the implementation cost of the system is reduced, and the coherence between signals can be effectively ensured.

Description

technical field [0001] The invention relates to a microwave photon radar detection method, in particular to a microwave photon MIMO (Multiple-Input Multiple-Output, multiple-input multiple-output) radar detection method with difference frequency multiplexing and a microwave photon MIMO radar device. Background technique [0002] The use of modern radar is highly diversified, including air traffic control, vehicle collision avoidance and meteorological precipitation detection, etc. High precision, high resolution and real-time multi-target detection have always been the development direction of radar. High-resolution imaging requires the support of large-bandwidth transmission signals, MIMO technology and high-speed sampling systems (see [Pan Shilong, Zhu Dan, Zhang Fangzheng. Microwave Photonics for Modern Radar Systems[J]. Transactions of Nanjing University of Aeronautics and Astronautics, 2014, 31 (03):219-240.]). [0003] Multiple input multiple output (MIMO) radar is a ...

AI Technical Summary

Problems solved by technology

However, this method needs to generate M local oscillator signals of different frequencies, and needs to use M modulators. The structure is complex and the cost is high. At the same time, the coherence of the system cannot be guaranteed, which limits the subsequent signal processing.

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