Spectrum Sensing Of Ultra-wideband Radio Frequency Signal Based On Quantum Compressed Sensing

With the rapid development of information technology,especially breakthroughs in5G communication,frequency hopping communication,microwave radar,and other technologies,spectrum resources are becoming increasingly strategic and scarce.Real-time measurement of broadband and high-resolution radio frequency signal spectrum is of great strategic significance to promote technological development in key fields.The traditional radio frequency signal real-time measurement technology is limited by the sampling rate of ADC and the digital signal processing capability,and has some problems such as small measurement bandwidth,large amount of sampled data,low spectral resolution and easy to be affected by electromagnetic interference.The application of quantum mechanics in the field of precision measurement has brought many benefits,and the use of quantum resources and effects can break through the limitations of traditional measurement methods.This thesis proposes a spectrum sensing technology for ultra wideband radio frequency signal based on quantum compression sensing,which integrates quantum technology with the concept of compression sensing,breaking through the limitations of traditional real-time spectrum analysis technology in which bandwidth is limited by sampling theorem in real-time analysis,overturning traditional radio frequency signal spectrum measurement technology,and constructing a compression sensing machine through modulated photon wave functions of the measured radio frequency signals to achieve compression measurement of ultra-wideband radio frequency signal,Significantly improves spectrum sensing bandwidth.The research content and innovation of this thesis are as follows:1.Broadband radio frequency signal sensing is developed and broadband photon wave function modulation is realized.In this work,integrated electro-optic crystal is used as radio frequency signal sensing,and the wave-function modulation of coherent photons is realized by utilizing the wideband spectral response characteristics of electro-optic effect,and the quantum compressed sensing system is constructed.By building a radio frequency signal sensing characteristics test system,the radio frequency signal sensing characteristics and waveform response are tested and verified.The experiment demonstrates the long time frequency spectrum monitoring of power frequency and medium frequency high voltage signal,and the real time frequency spectrum measurement of high frequency radio frequency signal.Under the Fourier limit spectral resolution,the real-time spectrum analysis bandwidth of the magnitude of GHz is realized.At the same time,electro-optical crystal as radio frequency signal sensing is not limited by radio frequency frequency and antenna size,which is convenient for miniaturization and integrated design.2.Design and build the ultra-wideband radio frequency spectrum sensing system to achieve the quantum compression measurement of broadband radio frequency signal spectrum.Through the quantum physical processes such as the photon wave function modulated by the measured radio frequency signal and the quantum state measurement collapse,the quantum compressed sensing is realized,and the broadband spectrum sensing with quantum advantages is realized.The time-dependent single photon counting technology and the optimized data recovery algorithm are used to realize the broadband measurement of the radio frequency signal spectrum.The GPS clock crystal oscillator locking technology provides a long-term stable clock reference for the system and improves the stability and accuracy of spectrum sensing.This work makes up for the defects of traditional electronics compressed sensing system and microwave photonics real-time spectrum measurement technology.Compared to existing commercial real-time spectrum analyzers,the real-time analysis bandwidth of the system has been improved by tens of times.In the experiment,under the Fourier limit spectrum resolution,the system achieves a real-time spectrum analysis bandwidth of 20 GHz,and the data compression rate reaches 1.7×10^-5,which can meet the needs of 5G wireless communication,cognitive radio,and other applications for broadband radio frequency signal spectrum measurement.3.Research on the integration of ultra-wideband radio frequency signal spectrum measurement system based on quantum compressed sensing was carried out,and the engineering prototype was developed.Combining the design idea of ultra-wideband radio frequency spectrum sensing system,integrated photoelectric instruments are adopted.By using clock phase division and delay line interpolation technology,a time digital converter based on FPGA is designed.At the same time,combining with the optimization algorithm to reduce the algorithm execution time,so as to realize the GHz scale radio frequency signal spectrum measurement,analysis,data storage playback and other functions.Finally,the research on integration of experimental system is carried out,and the engineering prototype of integrated wideband radio frequency spectrum sensing is successfully developed.