Zero‐bias elimination with selective non‐commensurate sampling for PN code tracking. Issue 3 (20th February 2020)

• Record Type: Journal Article
• Authors: Ma, Chunjiang; Ni, Shaojie; Tang, Xiaomei; Xiao, Zhibin; Sun, Guangfu
• Is Part Of: IET radar, sonar & navigation. Volume 14:Issue 3(2020)
• Page Start: 349
• Page End: 355
• Publication Date: 2020-02-20
• Subjects: statistical analysis -- thermal noise -- synchronisation -- Doppler shift -- spread spectrum communication -- signal sampling -- pseudonoise codes -- modulation; zero‐bias elimination -- PN code tracking -- high‐precision applications -- digital code‐tracking loop -- code‐phase zero bias -- incomplete sampling -- STD -- code correlation reference waveform -- digital discriminator zero bias -- zero‐bias MAX -- selective noncommensurate sampling frequency design method -- pseudonoise imaging -- spread spectrum signal sampling -- maximum deviation -- standard deviation -- analytical expressions -- per code Doppler -- binary offset modulation -- thermal noise -- fibre optic time synchronisation equipment -- statistical analysis model -- PN; Signal processing -- Periodicals; Radar -- Periodicals; Sonar -- Periodicals; Electronics in navigation -- Periodicals; Navigation -- Periodicals; 621.3848
• DOI: 10.1049/iet-rsn.2019.0161
• Languages: English
• ISSNs: 1751-8784

Abstract

Abstract : Zero bias is the main source of error in high‐precision applications based on pseudo‐noise (PN) ranging. This study proposes a selective non‐commensurate sampling frequency design method applied to the digital code‐tracking loop which can effectively suppress the code‐phase zero bias caused by incomplete sampling of the spread spectrum signal. The maximum (MAX) and standard deviation (STD) of the zero bias independent of code and the initial phase are used to design the sampling frequency. The code correlation reference waveform is utilised to establish a statistical analysis model of the digital discriminator zero bias. Analytical expressions of the zero‐bias MAX and STD are derived. The performance of the proposed method is assessed as per code Doppler, binary offset modulation, and thermal noise. Fibre optic time synchronisation equipment is used to determine the feasibility of eliminating PN code‐tracking zero bias based on selective non‐commensurate sampling.