UAV Wireless Measurement And Control System Based On AD9361

With the rapid development of software-defined radio technology and aircraft equipment such as drones,wireless measurement and control systems are becoming increasingly important in various related fields such as aerospace and industrial production,and at the same time,people put forward higher requirements for the volume,power consumption and reliability of data transmission of wireless measurement and control equipment.The traditional wireless measurement and control system has many discrete devices,single functions,and poor compatibility,and when new communication protocols or design requirements appear,the equipment cannot be fully utilized,and the development cycle is long.Therefore,the design of a miniaturized,low-energy,multi-functional,highly integrated wireless measurement and control equipment,and through the reasonable selection of communication system and transmission and reception channel parameters,to achieve reliable transmission of information and data is still the research focus of wireless measurement and control system.In order to solve the problems of multiple discrete devices,single functions and long development cycle of traditional wireless measurement and control platforms,this paper proposes an implementation method for wireless measurement and control system equipped with FPGA and AD9361.Based on the idea of software defined radio,this system uses FPGA as the main control chip to complete the processing of baseband data,and builds a Micro Blaze soft core as a processor to complete the register configuration of the AD9361 chip.This system realizes the data interaction between the FPGA baseband module and the AD9361,and has the advantages of small size,multi-function and high flexibility.In order to overcome the influence of Doppler frequency offset between high-speed moving transceiver devices,DSSS-DQPSK is selected as the modulation and demodulation scheme of wireless measurement and control system,and the selection of spread spectrum scheme,the design of forming filter,and the design of synchronization module are introduced in detail,and the synchronization scheme under large Doppler frequency bias is studied.In order to reduce the synchronization time and reduce the complexity of hardware implementation,the system adopts the parallel frequency sweep method combined with FFT spectrum analysis method for carrier synchronization,and the matching filter method combined with the method of leading lag loop for spread spectrum code synchronization,Matlab and Vivado simulation results show that the scheme can achieve good capture accuracy and reliable data transmission under large Doppler frequency offset and noise interference.After that,the RF scheme of the wireless measurement and control system was designed and implemented,and the FPGA was used as the main controller of the system to complete the transmission and reception channel control of the AD9361 chip and the configuration of various registers.Then,a wireless measurement and control system based on AD9361 was realized,the design ideas and development process were explained,and a functional test platform was built for the transmission and reception test of the system.Finally,the baseband processing part and the RF part of the wireless measurement and control system are synthesized,and the functional tests are carried out,and the results show that the system has good transceiver performance and can be applied to a variety of application scenarios.