联合气压测高定位的高程转换问题  

Study on the height conversion in barometric altimeter assisted positioning

作　　者：刘成[1,2] 施浒立[1,2] 

机构地区：[1]中国科学院国家天文台,北京100012 [2]中国科学院研究生院,北京100190

出　　处：《测绘科学》2015年第6期6-10,共5页Science of Surveying and Mapping

摘　　要：针对利用联合气压测高技术进行导航定位时,直接测量获得的用户海拔高与定位解算中所需的大地高容易被混淆的问题,该文提出将气压基准站作为水准重合点,向用户传输高程异常值以进行高程转换;或在区域范围内建立局域坐标系,直接获得Z坐标值,并进行降维定位解算。这两种方法能够适用于不同情况,解决了气压测高应用范围与测量精度之间的矛盾。最后,通过在校园网中进行的实测实验,对方法进行了验证。结果表明,本方法可以较好地消除高程差异,有效提高定位精度。Aiming at the contradiction that the height measured by barometric altimeter is the altitudeheight, but the one which required in positioning solution is the geodetic height, using the pressure basestations as the level coincident points was proposed in this paper, and the height anomaly value was trans-mitted to the user for height conversion; also establishing local coordinate system in region area and obtai-ning Z value directly were proposed, thus the positioning solution could be figured out by reducing the di-mensions. The two methods were suitable for different situations, and solved the contradiction betweenapplication range and measurement accuracy of barometric altimeter. Experimental results showed that the methods could eliminate height difference and improve positioning accuracy effectively.

关 键 词：卫星导航定位 气压测高 大地高 海拔高 高程转换 

分 类 号：P228.4[天文地球—大地测量学与测量工程]