Microwave photon MIMO radar detection method and microwave photon MIMO radar system

Abstract

The invention discloses a microwave photon MIMO radar detection method comprising modulating M intermediate-frequency linear frequency-modulated signals with the same bandwidth and chirp rate and non-overlapped frequency on M optical carriers with different wavelengths to generate M optical signals where only the positive and negative second-order sidebands are retained; merging the M optical signals by an optical wavelength division multiplexer and then dividing a combined optical signal into two channels; dividing the optical signal in one channel into N reference light beams; subjecting theoptical signal in the other channel to photoelectric conversion and separating and transmitting M orthogonal linear frequency-modulated signals therein; receiving, by N receiving antennas, the targetreflected signals, performing de-chirp processing and wavelength demultiplexing, and subjecting the obtained M optical signals to photoelectric conversion, low-pass filtering and analog-to-digital conversion to obtain M*N digital signals, processing the digital signals to obtain a target detection result. The invention also discloses a microwave photon MIMO radar system. The method can greatly improve the range resolution and azimuth resolution of the radar system.

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 and a microwave photon MIMO radar system. Background technique [0002] Radar is the main means for humans to detect and identify all-weather targets. Multi-functional, high-precision, and real-time detection has always been the goal pursued by radar researchers. In order to achieve high-performance target detection and high-resolution imaging, large-bandwidth transmitted signals and fast digital signal processing are required to detect objects. 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 radar systems," IEEE Microw.Mag., 16(8), 74-83(2015).]), it is difficult to rea...

AI Technical Summary

Problems solved by technology

Although the introduction of microwave photonics technology can obtain high-carrier frequency and large-bandwidth transmission signals, which improves the range resolution of radar (see [F. Zhang, Q. Guo, and S. Pan, "Photonics-based real-time ultra-high -range-resolution radar with broadband signal generation and processing,"Sci.Rep.,7,13848,(2017).]), but the azimuth resolution of the radar needs to be achieved by the relative rotation of the target and the radar, which means that a large Coherent Processing Interval (CPI) or long measurement time is required to obtain high azimuth resolution

In the practical application of detecting non-cooperative targets whose motion trajectory and parameters are unknown, this is not always feasible, because the fluctuation of the target's velocity and attitude will degrade the target detection ability of the radar

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