用于JATC远程时间比对的双频GPS接收机

中国科学院国家授时中心为“我国综合原子时（JATC）建立与保持的研究”项目研制的双频多通道GPS时间传递接收机NTSCGPS-2，不仅具有远程时间比对的功能，还增加了我国综合原子时需要的本地钟比对功能和精密定位功能。在不增加其它比对设备的情况下，满足JATC项目对远程时间比对的要求。NTSCGPS-2具有如下性能特点：（1）采用双频观测，可实测电离层时延；（2）远程（西安-上海、西安-澳门）时间比对精度达到2ns；（3）具有本地钟间的比对功能，在正常共视观测的同时，还可进行2个本地钟间的比对；（4）具有精密定位功能，相对定位精度为5cm。

A Dual Frequency GPS Receivers Developed to Compare Time for JATC

A type of dual frequency multi-channel GPS receiver,NTSCGPS-2,developed at the National Time Service Center,the Chinese Academy of Sciences for the project the Research on Establishing and Maintaining the Joint Atomic Time System of China,not only has the function of remote time comparison but also has the function of local clock comparison and accurate positioning,meeting the needs of JATC without adding other device.The performance and characteristic of the receiver NTSCGPS-2 are as follows:(1)It can measure the ionospheric delay in real time via dual-frequency observation;(2)The precision of the time comparison between remote clocks is better than 2 ns(for the baselines of Xi'an-Shanghai and Xi'anMacao);(3)It can make the time comparison between local clocks inside the same laboratory.Both the common view observation and the time comparison between two local clocks can be conducted at the same time;(4)It can make precise positioning with a relative positioning precision of 5cm.