Study Of Communication Interface Of Mobile Surveying System

As mobile devices gain their ground daily, they are more and more found in surveying engineering presently. And one of the most significant development directions in this field is, to apply PDA to engineering survey and make the job-both data acquiring and processing-done at one time. Make the ambition come true, communication barriers have to be bridged between PDA and surveying instruments. And some in-depth researches are carried out right on the subject in the thesis.The main contents of the thesis are summarized as follows:I. A survey of the current status of PDA and embedded system, including their manufacturers, operating characteristics and applications, is made.II. A study on communications between total station and PDA is presented. The study is based on the structure, functions and applications of total station. Also included in the study are data structures and analytic methods of some familiar total stations. We also designed a communication interface between PDA and total stations. The design can be used to control total station's work on PDA.III. Essential theories of communication standard NMEA-0183 of GPS are expatiated. Key technologies of data communications between GPS and PDA are researched, including interface design, data receiving and processing, coordinate transformation. We have designed and developed a communication interface between GPS and PDA, discussed and analyzed traditional GPS programming and the new GPSID method.The research of mobile surveying communication interface based on PDA plays a significant role in improving work efficiency of field survey and bettering its work mode. The technologies, schemes and developing methods discussed in this thesis can provide a foundation for future surveying-related PDA development and application.