Optical carrier distributed radar detection method and device based on photon up-conversion

Abstract

The invention discloses an optical carrier distributed radar detection method and device based on photon up-conversion. In a central station, an optical carrier is modulated by the intermediate frequency linear frequency modulation and a single-frequency local oscillator signal, and a combined modulated optical signal formed by an intermediate frequency linear frequency modulation modulated optical signal with only a one-order sideband of one side and a single-frequency local oscillator modulated optical signal with only a one-order sideband of the other side is generated. In a remote detecting unit, the combined modulated optical signal is split into two paths, one path is subjected to photovoltaic conversion and then is emitted, a received target reflected signal is modulated to anotherpath of the combined modulated optical signal, an optical carrier receiving signal is obtained, and then the optical carrier receiving signal is transmitted back to the central station. At the centralstation, the optical carrier receiving signal is subjected to photovoltaic conversion, analog-digital conversion and digital signal processing to obtain target detection information. The invention also discloses an optical carrier distributed radar detection device based on photon up-conversion. The invention has the advantages of large bandwidth, low loss, flexible and adjustable working band and simple structure.

Description

technical field [0001] The invention relates to a distributed radar detection method, in particular to a light-carrying distributed radar detection method and device based on photon up-conversion. Background technique [0002] Common target detection systems include lidar systems, visible light camera monitoring, infrared camera monitoring, and millimeter-wave radar systems. Among them, the probes of lidar system, visible light camera monitoring, and infrared camera monitoring technology require optical windows, and the monitoring range is small, and is greatly affected by weather and time period, especially at night, rainy and snowy weather, etc., which will cause the resolution of the monitoring system to increase. decrease, the monitoring distance becomes shorter and other results. [0003] Millimeter-wave radar is the main means for humans to detect and identify all-weather targets. Multifunctional, high-precision, and real-time detection has always been the goal pursue...

AI Technical Summary

Problems solved by technology

Due to the bandwidth limitation of electronic devices, the traditional radar system directly generates only a few gigahertz signals (see [P.Ghelfi, F.Laghezza, F.Scotti, G.Serafino, S.Pinna, D.Onori, E.Lazzeri, and A.Bogoni, "Photonics in radarsystems," IEEE Microw.Mag.,16(8),74-83(2015).]), it is difficult to realize the generation, control and processing of large bandwidth signals

As the next-generation radars have increasingly urgent demands for higher carrier frequencies and larger operating bandwidths, it is difficult for traditional radars to meet the needs of future applications.

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