Design And Implement Of LTE-based Passive Radar Receiver System

This thesis presents experimental results of target detection using a miniaturized multichannel passive radar system that exploits Long Term Evolution(LTE)signals.LTE signal is a new type of illuminator of opportunity for passive radars.It has been widely concerned at home and abroad due to its high penetration rate,broad bandwidth and excellent coverage at low altitude.In this thesis,aiming at the requirement of the target detection,a highly integrated and miniaturized multichannel LTE-based passive radar receiver system is designed.The system possesses the advantages of miniaturization,generality and low cost,compared with conventional passive radar systems.The system uses the highly integrated AD9361 RF chip for receiver design.With a zero-IF structure integrated in the chip,the complexity of the system is greatly reduced.The system also has a wide operating frequency bandwidth and is able to support different sampling bandwidths,making it good for covering LTE signals in all frequency bands.In order to meet the real-time transmission requirements of high-speed data in the system,a 10 Gigabit Ethernet transmission method is used to realize the data interaction between the receiver and the signal processor,which greatly increases the transmission rate of the system.Based on win cab,the upper computer software for data acquisition is designed to realize the receiving and storing of the radar data.The structure of this thesis is organized as follows.First,the physical layer characteristics of the LTE signal,he Frequency Division Duplexing Long Term Evolution(FDD-LTE)signal is chosen for detailed research,and its characteristics on the distance resolution,velocity resolution and the ambiguity function of the signal are discussed.It theoretically demonstrates the technical feasibility of the LTE signal for using as the third-party illumination in target detection.Based on the analysis,the overall design of the LTE-based passive radar system is given.The introduction of the system design consists of two parts: the design of the RF front-end module and the design of the 10 Gigabit Ethernet transmission module,including hardware circuit design,FPGA logic design and upper computer software design.After that,the function of each part of the system is tested,including AD9361 configuration,10 Gigabit Ethernet interface and receiver system performance.Finally,the first domestic experiment on ground and low-altitude target detection experiments based on LTE signal using the designed radar system are carried out by using the system is introduced,including the experimental scene configuration and preliminary experimental results The agreements between the experimental results and their true trajectory proved the technical feasibility of using LTE signals in detecting ground and low-altitude targets.The work described in this thesis lays the foundation to further develop the LTE-based passive radar.