Design Of Image Transmission System Based On UAV Platform

In recent years,with the continuous expansion of drone applications,Video image transmission has become the standard for most drones,and this function has gradually become one of the most important parts of drone applications.It collects video through a camera carried by a drone and sends it to the ground for real-time display,enabling the drone to perform more and more complex tasks in the air.UAV video transmission technology has also evolved from the simple display of the beginning to low-latency,high-definition,and long-distance directions.This paper designs an image transmission system for UAV platform and verifies the transmission function and feasibility of the image transmission system through the actual communication environment.In this paper,an image transmission system based on video signal acquisition,video data encoding,baseband signal processing,and wireless channel transceiving architecture is specifically designed.The system is divided into UAV transmitter and ground receiver.At the transmitter,the video data passes through the ADV7181 D to the ADV212 and is hard coded using the JPEG2000 standard.By consulting the ADV212 and ADV7181 D chip manuals,By understanding the composition and function of ADV212 and ADV7181 D,the Z7035 configuration of ADV212 and ADV7181 D is completed.Wireless transceiver using AD9361 video chip,through the Z7035 signal baseband processing,and then sent through the AD9361.The receiving end adopts AD9361 to receive the signal and arrives at Z7035 to realize the baseband processing and then decode to ADV7341 through ADV212 and transmit it to the display for display.The works includes:(1)First design the hardware circuit board of the image transmission system,and draw the schematic diagram to complete the hardware system board,as the supporting platform for the entire system.This hardware circuit uses the Xilinx Z7035 as the main controller and the ADV212 as the video data encoding and decoding chip.Taking the PL part of Z7035 as the baseband processing core and AD9361 as the core of the wireless channel module;constructing an image transmission system hardware platform based on the Z7035+ADV212+AD9361 system.(2)By transplanting Linux to Z7035,the operating system is built,and then drivers for ADV212,ADV7341,ADV7181 D,and AD9361 modules are written on the operating system platform.(3)Analyze the OFDM(Orthogonal Frequency Division Multiplexing)modulation and demodulation technique and complete the baseband processing of the signal on the PL of the Z7035.(4)Finally debug and functional verification of the entire system.This paper finally realized the hardware circuit design and hardware and software integration of the image transmission system for the UAV mobile platform and verified the final image transmission function.After the actual field communication environment test,the image transmission system functions normally.The transmission performance of the image transmission system meets the design requirements: in the visually unobstructed environment,the communication distance can reach 10 km.