Design And Development Of Embedded Software For Micro SAR Imaging System

Synthetic aperture radar,as an active ground observation system,has all-time,allweather imaging characteristics.Since the 1950 s,it has been widely used in the military and civilian fields and has always been a research hotspot in the field of radar technology.In recent years,with the emergence of unmanned airborne platforms and the need for miniaturization of radar systems,miniature SAR has rapidly developed in the field of radar due to its small size,light weight,and low cost.This paper takes embedded software design and implementation of micro SAR imaging system as the main research direction,and studies and analyzes the matched filtering technology and micro SAR imaging algorithm involved in imaging system.Combining engineering applications with the needs,we designed and implemented a real-time imaging software system supporting micro SAR.The specific work is as follows:1.Research and analyze the matched filtering technology of the micro SAR imaging system.It is concluded that the dechirp technology has a comparative advantage in simplifying the structure of hardware equipment and optimizing the amount of imaging operations.It is suitable for micro SAR systems.At the same time,based on the calculation amount and real-time consideration,the polar coordinate format algorithm was selected as the imaging algorithm of this system,and its imaging processing flow was deduced.Finally,the embedded software development process and related technologies applied in the development process are introduced.2.In combination with the development and implementation of the micro SAR system,the overall structure design scheme of the system is introduced,and the signal transmission and processing flow is analyzed.Based on the system requirements analysis,the basic architecture design of the software system is realized.At the same time,with the help of the C/S model,specific structural designs are made for the embedded software and the host computer software.3.According to the software architecture design,combined with the functional requirements of each part,the specific implementation is divided into modules.The embedded system software implements task scheduling,interrupt processing,data imaging processing,and communication transmission under the VxWorks operating system;the host computer application software uses C# under Visual Studio 2015 to implement radar control,data analysis storage,and real-time image display.4.Carry out joint debugging test of the whole system.Through ranging,fixed-point imaging,verify the stability and accuracy of the software system to ensure that the micro SAR imaging system works in real time.