GNSS pseudorange and time‐differenced carrier phase measurements least‐squares fusion algorithm and steady performance theoretical analysis. Issue 23 (1st November 2019)

• Record Type: Journal Article
• Authors: Qian, Nijia; Chang, Guobin; Gao, Jingxiang
• Is Part Of: Electronics letters. Volume 55:Issue 23(2019)
• Page Start: 1238
• Page End: 1241
• Publication Date: 2019-11-01
• Subjects: radio receivers -- satellite navigation -- Global Positioning System; GNSS pseudorange -- TDCP -- steady performance theoretical analysis -- GNSS community -- pseudorange observables -- integer ambiguity -- measurement noise -- carrier phase observables -- high measurement accuracy -- high‐accuracy navigation -- ambiguity‐free time‐differenced -- popular data processing technique -- least‐squares fusion -- different pseudorange‐carrier‐phase precision ratios -- steady accuracy -- fusion pseudorange -- original pseudorange; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2019.2408
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : In Global Navigation Satellite System (GNSS) community, pseudorange observables, without integer ambiguity, have large measurement noise, while carrier phase observables, with high measurement accuracy, have integer ambiguity, which restricts the direct use either of them for high‐accuracy navigation and positioning. In this regard, fusing pseudorange and ambiguity‐free time‐differenced carrier phase (TDCP) is a popular data processing technique. In this Letter, the least‐squares fusion is studied. A theoretical analysis of the steady performance of this fusion is conducted. A set of formulas of the steady performance is derived, based on which simulations are carried out for different pseudorange‐carrier‐phase precision ratios. Results showed that the steady accuracy of fusion pseudorange is about two orders of magnitude higher than that of the original pseudorange, and is close to that of carrier phase observables. Besides, the convergence speed and the comparison to the Hatch filter are also checked in the simulations.