Micro SAR High Resolution Imaging System And Real-time Implementation

With the continuous development of synthetic aperture radar technology(SAR),synthetic aperture radar is widely used in military,agriculture,exploration and other fields.In recent years,traditional SAR imaging systems cannot be applied to small UAV platforms due to their large size and high power consumption,while Mini-SAR imaging systems have the advantages of low cost,low power consumption,small size,and real-time imaging.The system becomes the optimal solution for the small UAV platform.The Mini-SAR imaging system is composed of microwave front-end and imaging processing components.This paper mainly studies the imaging processing components to realize the functions of radar signal generation,acquisition,data storage,real-time imaging and data playback.The main structure of the Mini SAR imaging processing component is FPGA(Field Programmable Gate Array)+ DSP(Digital Signal Processor).Analog Digital Converter(ADC),Digital Analog Converter(DAC),e MMC(Embedded Multi Media Card)and DSP and other chip devices.Carry out research on the related design of micro SAR high-resolution imaging processing components.First,the principle of synthetic aperture radar,analog-to-digital conversion theory and digital-to-analog conversion theory involved in this paper are studied,the design indicators of imaging processing components are clarified,and the scheme of imaging processing components is completed.design.Next,complete the hardware circuit design and debugging of the imaging processing component according to the design scheme,including the chip selection of the hardware circuit,the schematic design of each module circuit,the layout and wiring design of the hardware circuit board,and the hardware circuit test.Secondly,according to the imaging processing component scheme,complete the design and verification of the logic code of each module,namely the clock module,DAC module,ADC module,Rapid IO high-speed interface module and e MMC storage module.Design the logic code of each module based on Vivado software,and then write a simulation test file for logic test and bit stream file burning test,and display the actual test situation through a logic analyzer(Integrated Logic Analyzer,ILA).The corresponding data is exported by the Vivado software,and then the results are analyzed by matlab to verify whether the logic module meets the design requirements of the component.According to the requirements of the scheme,complete the design of the acquisition and storage function,real-time imaging function and playback function,and complete the overall architecture design of the logic code.Finally,the analysis of the system joint coordination and results is completed.These include acquisition and storage function test of imaging processing components,real-time imaging and playback function test,microwave front-end and component joint test,inertial navigation and component joint test,mini-SAR high-resolution imaging system static test test,flight test 0.3-meter resolution and flight test 0.5m resolution test,the data results are analyzed by matlab.Finally,the imaging processing components designed in this paper are highly integrated and miniaturized,and meet the index requirements of imaging processing components.