Computer Aided Astronomical Positioning Error Analysis

As the most important reserved system of marine, astronomical positioning has its ownincomparable advantages. Applying computer technology to astronomical positioning couldquickly calculate complex equations not only achieve rapidy but also accurate positioning.The influence factors of common errors in astronomical positioning, such as instrument error,influencing the observed altitude error, are analyzed in this paper. A single object, doubleobjects and three objects of position error are also discussed in this paper. Since errors revivedand the correction equation established, the positioning error is further reduced. According tothe principle of spherical triangle, the mathematical model of a single object positioning,double object positioning and three celestial positioning are established. Then the correctnessand validity of the mathematical model has been verified by the practice. Finally the computeraided astronomical positioning program has been finished.With the development of simulation technology, this paper combines the error analysisand simulation technology. The change range of the error couled be analyed by its classified.By means of the error source analysis and classification, the establishment of correspondingcorrection equation reduces errors, so the positioning accuracy is further improved. Theaccuracy of calculation is more close to the value of GPS, positioning accuracy increase2’-3’.This makes the influence of error of astronomical navigation reduction, improves thepositioning accuracy and promotes the astronomical navigation technology.Through error analysis and calculation, higher accuracy grade of longitude and latitudecould be obtained. Through the analysis of the different positioning principle and procedures,the positioning calculation and the astronomical positioning real-time performance isguaranteed quickly.The construction of the computer aided astronomical positioning program interface formsthe not only human-computer interaction and the astronomical navigation experimentplatform,which lays an foundation of automation and modernization of the astronomicalpositioning.