Design And Implementation Of Wireless Communication Transmission System For Unmanned Aerial Vehicle

With high definition video codec technology,high precision satellite navigation technology,mobile base station positioning technology and broadband wireless communication technology in the application of the Unmanned Aerial Vehicle,the performance indicators and application scopes of the Unmanned Aerial Vehicle are greatly improved in recent years.The Unmanned Aerial Vehicle plays an important role in both industrial and military fields.With the continuous improvement of technical indicators,the wireless communication technology of the Unmanned Aerial Vehicle needs further exploration and development.Based on the laboratory UAV mapping problem,this paper achieves the communication between the monitoring and control equipment on the ground and the Unmanned Aerial Vehicle,that is,on the one hand achieves the monitoring and control equipment on the ground to send control instructions to the airborne equipment,on the other hand achieves airborne equipment can transmit the collected information to the ground.This paper presents the design and implementation of wireless communication transmission system based on AD9361+ZYNQ7045 platform.Existing solutions,while providing a complete wireless communication solutions,but in the face of military UAV communication frequency may be distributed in L band and S band and C band the fixed frequency point,can not meet the requirements.The design scheme proposed in this paper can be configured with RF operating frequency range of 70 MHz to 6GHz,which can satisfy the application requirements of multiple communication frequency points.The wireless communication transmission system of UAV is highly expandable,wide application and high integration,which can be used for reference in the design of wireless communication transmission system for UAV.The main work of this paper includes the following aspects:(1)This paper first discusses the background and significance of the research,the development process of UAV at home and abroad,and briefly describes the contents and contents of the research.This paper presents the design scheme of using AD9361 combined with ZYNQ7045 FPGA to realize RF part and baseband part respectively.Among them,the AD9361 RF chip mainly completes the work of the upper and lower frequency conversion,and the Xilinx FPGA ZYNQ7045 mainly completes the work of sending group frames and receiving frames,codec decoding and modulation demodulation.(2)This paper focuses on the design of the baseband part and the uplink and downlink frame structure of the wireless link of the ZYNQ7045,and combines the receiver sensitivity and free space loss to design and evaluate the relevant parameters of the system.(3)This paper focuses on the realization and analysis of the following four key technologies: convolutional coding and decoding technology,based on the Matlab platform to achieve convolutional coding and Viterbi decoding simulation;extraction and interpolation filter technology,the simulation of nine-fold extraction filter is completed in Vivado;the receiver carrier synchronous technology,aiming at the problem with large frequency deviation,the maximum likelihood frequency deviation estimation algorithm and QPSK demodulation method are adopted to achieve the goal of reducing frequency deviation,effectively restoring the original data information;based on Matlab platform,the simulation verification is realized;AD9361 internal gain control principle.(4)Aiming at the concrete realization of the baseband part,this paper puts forward the setting method of the PS terminal peripheral register and the SPI interface control method,and gives the code added in the PS to realize the BB_PLL of the AD9361 chip working at 1024 MHz.Then,the method of determining the transmitting and receiving channel signal through BIST is provided,and the self-test process of AD9361 chip is completed.Then,the modulation method of four phase absolute phase shift keying(QPSK)and four phase relative phase shift keying(DQPSK)modulation is discussed,and QPSK modulation is implemented in PL.Finally,the paper discusses the QPSK demodulation process and how to achieve frame synchronization in PL.(5)Through the laboratory equipment on the wireless communication transmission system for the various indicators of testing,after the success of the laboratory test,Jingwei M200 UAV of Da Jiang company is used to carry flight to test.Test results show that the design of the UAV wireless communication transmission system meets the initial design specifications.On the basis of the research of this system,the design and implementation of small UAV network,and UAV formation flight system and so on can be better to complete,which suits to the scene application of the future UAV formation squadron.