不同卫星截止高度角下GPS观测结果的对比分析  

Comparative analysis of GPS under different cutoff height angles

作　　者：龚俊 戴煜暄 曾利萍 GONG Jun;DAI Yuxuan;ZENG Lipin(Zhejiang Earthquake Agency, Hangzhou Zhejing 310013, China;Surveying and Mapping Science Institute of Zhejiang, Hangzhou Zhejing 311100, China)

机构地区：[1]浙江省地震局,浙江杭州310013 [2]浙江省测绘科学技术研究院,浙江杭州311100

出　　处：《北京测绘》2022年第6期800-805,共6页Beijing Surveying and Mapping

基　　金：浙江省地震局科技项目(2020zjj05)。

摘　　要：本文对23个时间跨度为4.2年的全球导航卫星系统(global navigation satellite system,GNSS)连续观测站,以卫星截止高度角分别是5°、10°、15°、20°、25°、30°和35°的全球定位系统(global positioning system,GPS)数据为研究对象,从双差观测数、观测噪声、观测精度和水平速度4项指标进行统计分析,结果表明:卫星截止高度角增加5°,每颗卫星平均的双差观测数减少12%左右;10°、15°和35°时噪声相对较低,相对来说35°卫星截止高度角噪声最低,在保证观测数据量时,高度角越高噪声越低;东西方向的观测精度低于南北方向,相对来说在10°、15°和35°的卫星截止高度角下,3个方向的精度较为一致;在没有遮挡和多路径等外部条件影响下,对于长期观测来说,5°~35°不同卫星截止高度角下的水平速度的差异不大。In this paper,23 GNSS continuous observation stations with a time span of 4.2 years were studied.Taking the GPS data with satellite cutoff height angles of 5°,10°,15°,20°,25°,30°and 35°as the research object,the statistical analysis was carried out from the four indexes of double difference observation number,observation noise,observation accuracy and horizontal velocity.The results showed that when the satellite cut-off altitude angle increased by 5 degrees,The average number of double difference observations per satellite was reduced by about 12%;The noise was relatively low at 10°,15°and 35°.Relatively speaking,the noise at the cutoff height angle of 35°satellite was the lowest.When the amount of observation data was guaranteed,the higher the altitude angle,the lower the noise.The observation accuracy in the east-west direction was lower than that in the north-south direction.Relatively speaking,the accuracy in the three directions was relatively consistent under the satellite cutoff height angles of 10°,15°and 35°.Without the influence of external conditions such as occlusion and multipath,for long-term observation,there was little difference in horizontal velocity under different satellite cutoff height angles of 5°~35°.

关 键 词：全球定位系统 卫星截止高度角 噪声量级 数据精度分析 

分 类 号：P228.4[天文地球—大地测量学与测量工程]