Development of high precision and multifunctional timing system using integrated GPS/BD receiver

A highly precise and multifunctional timing system using the self development integrated GPS/BD time receiver is presented in this paper. The authors firstly designed an integrated GPS/BD (compass or Beidou navigation system of China) time receiver for time and frequency synchronization in a local network, and describing the main issues and the solution of the receiver implement in detail, and then focused on performance considerations. The receiver has been used as the major part to implement the timing system. The timing system can offer precise time code and frequency signal including standard frequency signal 5 MHz and 10 MHz, 1 pps and the serial time code data et al. The common view comparison technique is used in each sub-system for eliminating the common error of sources, and the observation data can be transferred between each station by wireless or internet. To keep the time synchronous precision within 10 ns between the master station and any slave station according to the observation results, phase shifting control and frequency division have been used which exploit their full level of performance. With the timing system, time comparisons are performed with a precision of 7.4 ns for a short baselines and 6.6 ns for a super short baseline. The result of traveling clock experiment indicates that the synchronous precision was 2.7 ns. The frequency stability of one second, 1.3 E-12 was achieved. The timing system can be used to supply high time and frequency signal for radar tracking, communication system, power grid and intelligent transportation system etc.