利用GPS时间传递数据修正接收机天线坐标

在采用ＧＰＳ进行共视时问比对过程中，当两站位置相隔不大长（小于１０００ｋｍ）时，由于卫星轨道误差、电离层和对流层延迟修正的误差可减少至只有几纳秒，可以主为接收天线位置的误差是其主要误差来源．利用ＧＰＳ本身的时间比对数据，不必增加别的数据来源和设备，采用相对定位的方法可提高定位精度，从而提高时间比对的精度．本文利用日本（ＣＲＬ）和北京天文台（ＢＡＯ）之间五天的共视时间比对数据，对（ＢＡＯ）的天线坐标进行修正．在水平方向和高程方向的修正偏差分别为２．９ｍ和５．６ｍ．如果试验数据足够，修正６４效果会更好．

The Modification of the Coordinates of GPS ReceiverAntenna by Using Time Comparison Data

In GPS common view time comparison,errors due to satellite orbit, ionospheric delay and tropospheric delay can be reduced to the order of nanoseconds;if the distance between the twO stations is not very long (within 1000km). In this case, the error mainly arises from the error of antenna coordinates. By using GPS time comparison data without any additional data and equipments,the precision of antenna coordinates can be improved with the relative positioning method,and then the precision of time comparison is improved.GPS common view experiment was carried out between CRL and BAO for five days. Theantenna coordinates at BAO were modified by using the aforementioned method and data.The results show that the modified biases in level and altitude are 2. 9m and 5. 6m, respectively. The results could be much better. if the data are sufficient.