Although the first generation QZSS timekeeping system (TKS) will be based on the Rb clock, the first QZSS satellites will carry a basic prototype of an experimental crystal clock synchronization system.
雖然第一代QZSS的計時系統（TKS，timekeeping system）使用銣原子鐘，但第一個QZS將攜帶一個實驗性質的晶體時鐘同步系統原型。