Research On Data Quick Unloading Method Based On IRIG106 Chapter 10 Standard

Chapter 10 of IRIG106,Airborne Digital Recording Standard,is a unified data format defined by the Range Command Committee of the United States(RCC).It realizes the digitalization and effective combination of various data in a more economical way.After the formulation of the standard,the format of recording medium is no longer required uniformly for recording high-speed data,but uniform data format,forming a generally accepted data interface.At present,IRIG digital recording standard has gradually become one of the internationally recognized standards.It has been popularized and applied in the field of aircraft flight test and weapon equipment test.After that,the standard has been continuously improved and updated to apply to more application environments.Since 2007,the world's major recorder manufacturers have started to introduce a data recording solution for flight test airborne test based on solid-state memory and IRIG106 Chapter 10 standard,which has become the mainstream test technology for aviation flight test,in accordance with the data acquisition and common interface standard for aircraft recorder developed by the telemetry group under the Joint Range Commander Conference of the United States.This paper is based on the research of data fast uninstallation of IRIG106 Chapter 10 Digital Recording Standard,and analyses the data format and recording structure of IRIG106 Digital Recording Standard.In this paper,the external solid state disk of industrial computer is used as the storage medium of the final data,and the effective data in the airborne solid state disk is transported to the final storage medium by the fast unloading method.A fast data unloading method based on the digital recording standard of Chapter 10 of IRIG106 is proposed,which can be compatible with multiple data transmission interfaces,data storage media and data types.Enough to detect the validity and integrity of data,if invalid or abnormal data are found,invalid data can be automatically eliminated and only valid data can be saved.The data uninstallation method proposed in this paper mainly includes four parts.The first part is data reading in IRIG106 format.The main purpose is to connect the storage media of IRIG106 format data to the computer according to different storage media and interfaces.Then the airborne solid state disk is converted into identifiable device handle by CreateFileA function,and the device handle is converted into identifiable device handle by FileStream class.The file stream that is easy to read is read and written by StreamReader/StreamWriter class.The second part is the establishment of directory block.Chapter 10 of IRIG106 determines the data storage form of disk,directory block and file,but the format NTFS can not be recognized.It needs to be converted into NTFS format recognition form and stored.So the method proposed in this paper is three levels: disk,directory block and file.On the basis of data structure,the data structure of unloading catalogue is added,which consists of four levels.All catalogue information is stored through static classes and class lists for data unloading and data recovery.The third part is data unloading,which is divided into normal data unloading and damaged data unloading.Normal data unloading is created through the second part of the data structure,with files as the basic unit.After reading data into memory and extracting valid data packets through files,file periods or time periods,the valid data will be saved to the external solid-state disk of industrial computer according to the specified storage name.According to the degree of data damage,the unloading of abnormal data can be divided into three categories: index package damage,data packet damage and extreme cases.For each abnormal case,effective data recovery or loss is proposed.Bad data uninstallation method will ultimately save the effective storage to the external solid state disk of industrial computer according to the specified storage name;the fourth part of data validity and integrity testing,IRIG106 Chapter 10 Digital Recording Standard itself on data type,data length,counting and so on,while the effective data stored in the data package also has the characteristics of data length,data identification and so on.This method detects the integrity and validity of the digital record standard package while uninstalling the data.After the data uninstallation,it continues to detect the continuity of the valid data carried in the data package,so as to ensure the reliability of the data.The method presented in this paper is independent of each other and interconnected by interfaces.It can be upgraded and used independently to ensure the scalability and scalability of the method.