Positioning technology based on the shadow of the Sun

被引：0

作者：

Wang, Yumeng ^{[1
]}

机构：

[1] Sch North China Elect Power Univ Baoding, Baoding 071000, Hebei, Peoples R China

来源：

PROCEEDINGS OF THE 2016 6TH INTERNATIONAL CONFERENCE ON MACHINERY, MATERIALS, ENVIRONMENT, BIOTECHNOLOGY AND COMPUTER (MMEBC) | 2016年 / 88卷

关键词：

Sun elevation angle; the least square method; over-determined equation; fitting;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mathematical problem of the changes of the shadow length of the straight bar according to the passage of time can be solved by transforming the problem to solve the sun elevation angle corresponding to the time. The sun elevation angle is determined by the local time and Sun's declination. By using the formula of sun elevation angle and the measuring time and the local latitude and longitude, the Shadow length variation curve can be drawn. Then, a general form of equation can be achieved by fitting the Shadow length variation curve and the coefficient of the fitting curve can be solved by using the collected measuring data. The minimum shadow length can be found and the corresponding time which means the local time at noon can be recorded. So that the longitude can be solved. The measuring data can be used to construct the over-determined equation, the local latitude can be solved by the least square method. This positioning technology can be used widely in daily life.

引用

页码：619 / 622

页数：4