結合GPS與雷觀機之照準定位系統作業精度研究

• Main Author: 白至栵
• Other Authors: 張嘉強
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/60543969617984351903

碩士 === 國防大學中正理工學院 === 軍事工程研究所 === 90 === The GPS system has the advantages of high precision positioning, short period observation, easy operation, and three-dimensional coordinates provided, without a function of observing any target actively and remotely. A laser observation device is capable of taking measurements, such as the relatively geometric quantities of distance and angle, to a target, without the ability of obtaining the spatial coordinates directly. When a system combined with the advantages from the two, it is of importance to implement a design and test procedures for the accuracy evaluation of this targeting and positioning system. Based on the error propagation theory, the positioning accuracy of the target is highly related to those of the measuring points themselves. This study is, therefore, aimed to realize the effectiveness of improving the coordinate accuracy achieved by the GPS point positioning technique at the measuring points. Some factors of making improvement to the GPS positioning, such as the use of post-processed satellite ephemerides, the process of receiver clock errors, the selection of satellite geometric conditions, the acquisition of observations, the correction of atmospheric delay errors, and the operation of a standalone pseudo DGPS, were all tested with the data collected. The accuracy assessment of the positioning coordinates achieved by the combined operation of the GPS and laser observation device has been carried out by this research. It has been shown from the tests that the proposed GPS point positioning model is able to improve the accuracy level of around 1 m (21%) on plane coordinates and even higher of around 12 m (56%) on vertical coordinates for the measuring points. The estimated 3-D coordinate errors of the targets, achieved by the combined operation of the GPS and laser observation device for a testing range between 200 and 7500 m, were tested to be effectively lowed down by 10 m (43%), and an estimated accuracy of the targeting position was proved to be around 14 m for this combined system designed.