The Design Of Data Processing Software For Absolute Gravimeter

Data processing software in an absolute gravimeter is an important part for the whole system.The software has functions of data acquisition,data processing,graphically displaying and saving results of processing.Based on Qt,an application framework platform,combined with Qwt which is a powerful third-party open source library for 2D drawing,the author completed the software design using method of object-orientation.The data acquisition function module realized data transmission between hardware system and application software based on TCP/IP transmission control protocol.The function of real-time data processing block is to obtain the accurate absolute acceleration of gravity g through a series of algorithm processing of acquired trajectory information of the free falling object.This paper gives detail analysis on algorithms applying to data fitting,correcting of environmental influencing factors and analyzing statistical results.Effectiveness of least square fitting,complex heterodyne method and genetic algorithm were compared and discussed in data fitting respect.Taking the fitting precision,complexity of algorithms,processing time and other performance requirements into account,least square fitting was chosen for programming finally.Effects of environmental factors on the absolute acceleration of gravity were analyzed,and corresponding correcting algorithms were given in this paper.Meanwhile,mathematical statistics was carried out on data processing results and persuasive evaluation indexes were provided.Results of software data processing are exported by means of graphically showing in windows and saving to project summary documents.Train of thought of designing and developing the data processing software in an absolute gravimeter was given at last.Requirement analysis,high-level design and functional tests about this application were presented specifically.