Research Of Mini-UAV SAR Real-time Imaging Based On ZYNQ SoC

Synthetic Aperture Radar(SAR)is an active microwave imaging system,it improves azimuth resolution by forming a virtual aperture with a way that by the relative movement between the platform and the target,the platform emits coherent radar electromagnetic wave signals and coherently processes the received echo signals.Compared with traditional SAR,the mini-UAV SAR designed for this study has the characteristics of smaller image width,shorter working distance,and more positive or negative squint.This thesis mainly focuses on the further study of the the mini-UAV SAR real-time imaging system design under the Linux operating system,aiming at the characteristics of the mini-UAV SAR by using the new ARM + FPGA embedded So C with heterogeneous multi-core architecture.The thesis focuses on the research under the Linux operating system and the mapping of SAR imaging algorithms on the embedded So C.Firstly,the thesis briefly analyzes the hardware platform used in this design,describe the special kernel architecture of the embedded So C XC7Z045,makes the research of the storage structure of the XC7Z045 and gives a summary of the resource distribution and communication interfaces on the entire processing board.Secondly,the thesis focuses on the design of Linux operating system.The Linux embedded operating system runs through the entire design process and the existence of the Linux system enables the entire design to be enhanced in terms of user convenience,hardware resource utilization,and capability expansion.On the basis of detailed research on Linux system development,the thesis realizes the establishment of a cross-compilation tool chain,and completes the design of the main components of the entire Linux embedded operating system,which includes U-Boot,system kernel,device tree and file system.Then the thesis completes the conversion of virtual address and physical address under the Linux system,thereby realizing the simplification of the character device control.The following,the thesis completes the design of acquisition module,the DMA driver and application design and realizes the data transmission with the SRIO interface.Finally,the design of SAR imaging processing part is described.Firstly,the SAR imaging algorithm is briefly analyzed,based on the analysis of SAR imaging algorithm,entire design of mapping SAR imaging algorithm on the embedded chip is completed,including system task allocation,the overall implementation process of SAR imaging,and the flow control under the Linux system.The following,the thesis discusses the important modules of the entire implementation process,including floating-point data processing,filter design,the implementation of dechirping and pulse compression in FPGA.Finally,the design is further optimized and the result is analyzed,the design of real-time imaging processing for the mini-UAV SAR is completed.