GPS靜態相對定位基線向量穩定性分析之研究

• Main Author: 李豐華
• Other Authors: 李振燾
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/62648400068873349868

碩士 === 國防大學中正理工學院 === 軍事工程研究所 === 90 === The main issues of GPS positioning are field project and computation task. The assignment of field project is to acquire GPS raw data, so the planning is concerned for select the instrument, the window of satellite, the session length, the cut-off angle of satellite, the sampling rate, the design of network, the surrounding of the occupied location, and so on. The duty of computation task is to get position of the unknown location, so the jobs are wanted to download the raw data, detect the cycle slip, correct the atmospheric delay, resolve the ambiguity, assess the baseline vector, check the loop closure, estimate the network adjustment, and so on. In fact, to fulfill the accuracy requirement of GPS survey, both field project and computation task are considerable factors. The focus of this research is on the computation task and the object is to analysis the stability of baseline vector from GPS dual frequency observations. The design of experiment is included two experimental fields that belong to short and mid-long baselines, two type of GPS receivers that are Leica and AOA Benchmark, and three software used that are GeoGenius, GPSurvey, Bernese. The subject of experiment I is to evaluate the capability of three software and the experiment II that includes signal noise of measurements, initial coordinates of reference point, sampling rate of recording, cut-off angle of satellite, session length, baseline length testing is to analyze their impact on baseline estimation. Finally, the relationship of positioning accuracy versus session length and positioning accuracy versus baseline length in both case of short and mid-long baseline are generated for use.