Research On General Control Software System For General Aircraft Avionics System

At present,Chinese general aircraft and its airborne avionics systems mostly depend on foreign advanced technology or import mature products protected by intellectual property rights at the initial stage.Then through digesting and absorbing them,we can develop some products and technologies with independent intellectual property rights and innovation.From the maturity of related technology development in China,airworthiness certification of airborne equipment and systems is one of the main problems of general aircraft avionics system.Although the framework of airworthiness laws and regulations has been constructed in China,we have not yet fully understood and mastered them and transformed them into realistic productivity.In the process of development,the key problems faced by the general avionics system control software system,especially the airworthiness certification and the partition management under VxWorks 653 operating system,have been deeply studied in the thesis,and the following results have been achieved:1.A graphics display driver scheme based on FPGA is proposed through the requirement of airworthiness authentication.The functions of simple processing of display data and video interface are realized in this scheme by using FPGA.The functions of graphics rendering,character overlapping and OpenGL acceleration are accomplished by utilizing the CPU of avionics integrated processing computer.2.In order to meet the airworthiness specification of airborne software,the transplantation and developing of the underlying graphics driver has been studied and implemented.OpenGL graphics system application program interface and PCI-E device driver under VxWorks 653 are developed and completed.3.A main time frame optimization algorithm is designed by researching the partition management problem under VxWorks 653 operating system.The validation shows that under the premise that all partition tasks can be completed before the deadline,the main time frame of the optimized algorithm is shorter and the system utilization is higher.