Zero‐bias mitigation method based on optimal correlation interval for digital code phase discriminator. Issue 11 (8th May 2019)

• Record Type: Journal Article
• Authors: Ma, Chunjiang; Lv, Zhicheng; Tang, Xiaomei; Xiao, Zhibin; Sun, Guangfu
• Is Part Of: Electronics letters. Volume 55:Issue 11(2019)
• Page Start: 667
• Page End: 669
• Publication Date: 2019-05-08
• Subjects: phase estimation -- correlation methods -- spread spectrum communication -- synchronisation; zero‐bias mitigation method -- digital code phase discriminator -- time synchronisation systems -- spread spectrum signal -- signal correlation peak -- zero‐bias code‐phase estimate -- zero‐phase deviations -- digital code phases -- optimal correlation interval design method -- zero‐crossing deviation; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2019.0265
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : In time synchronisation systems, the code phase of the spread spectrum signal is an important characteristic that can provide users with high‐precision and unambiguous observation results. However, digital code phase discriminators have limited sampling frequencies that distort the signal correlation peak and generates a zero‐bias code‐phase estimate. In this Letter, the authors evaluate and analyse the zero‐phase deviations of digital code phases. An optimal correlation interval design method, based on a code phase discriminator that can effectively suppress the zero‐crossing deviation, is also proposed. The simulation results show that the proposed algorithm can reduce the deviation of 96.5% and effectively improve the measurement accuracy of the code phase.