Design And Implementation Of The LRRT Software In Balise Testing System

For the last decade, the national railway is under a rapid development period, train speed advancing has been an orientation of evolution of national railway.Balises that provide point type information is used for correcting train location and achieving ground-train data exchange at certain position, tele-powering signal transmitting quality and up-link signal receiving quality in which balise transmission unit cross above ground balise in high speed have are related to a great extend with traveling safety of trains.Thus balise has become a kind of indispensable safety guarantee. The establishment of balise testing system is becoming increasingly necessary for enhancing the efficiency of testing needed for large-capacity balise, thus a testing system with automatic execution in a higher degree is urgently demanded.LRRT (Laboratory Reference Receiver Tool) is a crucial part within the system. This paper propose the scheme of designing and implementation process of LRRT software which aims at measurement device controlling for automatic testing and further signal disposal to change the fast that device link state checking, device front panel operating and testing results record by hand all by people in traditional test. LRRT software provides a more convenient way to execute test.Follows are the main contents of this paper:1.Based on domestic balise transmission system and constitute,function and working principle of current balise test system, elaborated the necessity of LRRT software development. Baesd on balise test specification, did needs analysis to discuss the possibility of designing and implementation of LRRT software.2.Using unified modeling language to model the software, designed internal structure and interactive logic of the software with visual language. By the analysis of Virtual Instrument Software Architecture and Standard Commands for Programmable Instruments, solved the difficulty of measurement device controlling so as to conduct the measurement of frequency field, phase field, and EVM characteristics of the certain signal.3.Put forward a scheme of separation,decoding,calculation of recorded signal from PXI-5122so as to conduct the analysis of time field characteristics of the recorded signal, and use software development tool to realize LRRT software.4.Using LRRT software to execute the demanded test item, verified the correctness of function implementation of LRRT software demanded by balise test system; furthermore,compared LRRT automatic test with corresponding software of other balise test system and verified that LRRT software improve the efficiency and convenience of the test indeed.