Design Of DSRC Logic Analyzer And Its Application In ETC System

DSRC (Dedicated Short Range Communication) technology is the core communication technology of ETC (Electronic Toll Collection) system. Through this technology, ETC system realizes the information exchange between RSU (Road Side Unit) and OBU (On Board Unit), and then the process of Non-stop auto collection.According to the demand of the ETC system, this paper presents a design named DLA (DSRC Logic Analyzer) that can be used to test the ETC system. The design can listen and analyze the information exchange process of DSRC in ETC system.The main work that this paper has done is described as following:(1) Research on Dedicated Short Range Communication national standard.(2) Research on USB2.0 (Universal Serial Bus) Transfer Protocol, method of multi-thread synchronous communication, method of data compression and storage, algorithm of FMO (Bi-phase Space) decoding and analyze of HDLC (High-level Data Link Control) protocol.(3) Research on method of the real-time wave displaying.The design has two innovations. The first one is the real time wave displaying, another is the FMO decoding and HDLC protocol analysis based on the sampling data of the baseband digital waveform. The two functions filled the blank of the test and analysis of DSRC communication performance in ETC system.Finally, this design has made a whole system test. The test result shows that the system preformed well and it can be used well to solve the problem of the ETC system test.