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Title: Impact assessment of the asynchronous clocks between reference and user receivers in differential pseudolite navigation system
Authors: Dou, J
Xu, B 
Dou, L
Issue Date: 1-Jan-2021
Source: IEEE sensors journal, 1 Jan. 2021, v. 21, no. 1, p. 403-411
Abstract: Compared with the Global Navigation Satellite System (GNSS), the asynchronous pseudolite (PL) navigation system does not provide corrections for the frequency deviation between PL signals. To realize precise positioning, a reference receiver is utilized to reduce the effect of frequency deviation between PLs via the differential method using carrier phase measurements. However, there exists time deviation between the user and reference receivers due to their asynchronous clocks. With this time deviation, the effect of frequency deviation between PLs cannot be removed thoroughly. Theoretical derivation and experimental verification indicate that the residual error in double difference of carrier phase measurements is proportional to the frequency deviation between PLs and the time deviation between receivers. To solve this problem, two approaches, refer to hardware and software methods, are proposed, which are experimentally proven to be feasible.
Keywords: Clock synchronization
Global navigation satellite system
Oven controlled crystal oscillators
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE sensors journal 
ISSN: 1530-437X
DOI: 10.1109/JSEN.2020.3014103
Rights: © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
The following publication Dou, J., Xu, B., & Dou, L. (2020). Impact Assessment of the Asynchronous Clocks Between Reference and User Receivers in Differential Pseudolite Navigation System. IEEE Sensors Journal, 21(1), 403-411 is available at
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