The Research Of Flight Data Acquisition And Processing System Based On Lonworks Technology

The rapid development of fieldbus not only provides a chance to develop the flight data acquisition system,but also challenges the low-leveled technology of flight data measurement,which urges to adopt the filedbus technology in the flight data acquisition-processing system.By connecting several data collectors with a single bus,which is the trend of development of flight data measurement,we can improve the data acquisition capacity and flexibility significantly.In this paper,the discussions are carried out about the flight data acquisition system based on fieldbus.The Lonworks technology,one of the many fieldbus technologies developed in recent years and as an open standard to all manufacturers,now has been widely used in the automatic areas ranged from industry,building,transportation,to power system.It integrates computer,network and control into one technology with open,highly distributed,interoperable systems.Neuron chip,whose network protocol has all layers of the ISO/OSI reference model,has the abilities of both communication and application control,provides 34 I/O object.The technology also provides versatile methods for building and managing the control networks;At the same time,some products based on Lonworks technology have been used on some foreign planes. So it is affirmed that Lonworks technology can be applied in flight data acquisition system.Traditional data acquisition system uses normal single-chip,which is enough for many circumstances.But,due to normal single-chip's poor mathematical operation ability,it is faint to be used in complex flight data acquisition and processing control fields.The DSP chip,which is special for complex mathematical operation and control fields,has rapid operation speed and higher mathematical operation ability.So,In order to solve the data acquisition and processing system's poor ability to deal with mathematical operation,this paper investigates a method of data acquisition and processing system bases on Lonworks,DSP and single-chip.This system integrates multi-processor,bases on DSP TMS320LF2407A to manage the data, bases on neuron chip FT3150 to communicate between each other,bases onsingle-chip processor AT89C52 to achieve local data acquisition.lt describes the implement of each part of the system in detail,and also presents the flow chart and part of software algorithmic of the data transaction.The system was designed based on modularization,So it is convenient for fixing and maintenance and it's easy to be finished on the cheap.