A clock steering method: using a third-order type 3 DPLL equivalent to a Kalman filter with a delay. (17th November 2015)

• Record Type: Journal Article
• Authors: Wu, Yiwei; Gong, Hang; Zhu, Xiangwei; Ou, Gang
• Is Part Of: Metrologia. Volume 52:Number 6(2015:Dec.)
• Page Start: 864
• Page End: 877
• Publication Date: 2015-11-17
• Subjects: clock steering -- digital phase locked loop (DPLL) -- transfer functions -- frequency stability; Weights and measures -- Periodicals; Weights and Measures -- Periodicals; 530.805
• DOI: 10.1088/0026-1394/52/6/864
• Languages: English
• ISSNs: 0026-1394

Abstract

Abstract: In this paper we propose a new clock steering method, which uses a third-order type 3 digital phase locked loop (DPLL) which is equivalent to a Kalman filter with a delay. A general overview of the theoretical framework is described in detail including the transfer functions, the structure and control values, the specifications, and the approach to choosing a parameter. Simulations show that the performance of the time and frequency steering errors and the frequency stability are quite desirable. Comparing with traditional clock steering methods, it is easier to work with just one parameter. The DPLL method satisfies the requirements of generating a local representation of universal time coordinated and the system time of a global navigation satellite system.