Design And Implementation Of Bus Monitoring Module In Airborne Test System Based On EtherCAT

The airborne test system is the core equipment of the flight test.It is used to collect a variety of analog,digital data,and then record,analysis and process these data.There are several questions in the data transmission of PCM,such as poor performance of anti-interference,limited transmission distance at high sampling rate and so on.Therefore,conventional PCM system can’t meet the growing testing demand for large aircraft.The real-time industrial EtherCAT,which has superior performance,can meet the real-time,synchronization,reliability,high-speed and many other requirements of on-broad test system.So the airborne networking test systems based on EtherCAT has broad application prospects.Combine with the laboratory research project "research,implementation and verfication of the key technology of data acquisition system based on real-time ethernet",this paper mainly focuses on the design and implementation of bus monitoring module in airborne test system.In this paper,we first give a brief introduction to the development status of the airb orne test system,then analyze the demand changes of the airborne test systems and deve lopment tendency of network tests.The EtherCAT communication protocols,system co mponents and IENA agreement are presented in the following.Finally,the design needs of the bus monitor module are put forward through analyzing the operating principle of the bus monitor module and data processing of EtherCAT master,and we have determin ed the design scheme on on the PowerPC440 platform.According to the system design scheme,the function of software and hardware is divided,and defined interfaces between software and hardware.Studied driver framework and development process under linux,and completed interrupt processing subroutine and IENA frame packing/sending process in linux cross-development environment.Through building system joint test platform,the functions of entire bus monitor had been verified,and the test results showed that the bus monitor module has designed reasonable to achieve the intended objective.