Title:
CLOCK FREQUENCY OFFSET TRACKING METHOD BASED ON WEIGHTED OBSERVATION FUSION AND TIMESTAMP-FREE INTERACTION
Document Type and Number:
WIPO Patent Application WO/2023/273363
Kind Code:
A1
Abstract:
The present invention relates to a clock frequency offset tracking method based on weighted observation fusion and timestamp-free interaction, which method belongs to the technical field of wireless sensor networks. The method comprises: a hidden node S which is located in an overlapping communication range of a reference node and a plurality of active nodes executing monitoring synchronization; and after a plurality of pairs of timestamp-free communication messages are successfully monitored, performing, by using a plurality of groups of extended Kalman filtering algorithms, multi-observation weighted fusion on a plurality of obtained tracking results according to a scalar weighted linear minimum variance information fusion criterion, so as to realize timestamp-free relative frequency offset fusion tracking of the hidden node. By means of the present invention, a relative clock frequency offset can be dynamically tracked on the basis that there is no message to be sent, and the influence of a synchronization node with a relatively large tracking error on a monitoring node can also be reduced, thereby increasing the robustness of frequency offset tracking of a monitoring node.
Inventors:
WANG HENG (CN)
LU RUI (CN)
PENG ZHENGCEN (CN)
WANG PING (CN)
LU RUI (CN)
PENG ZHENGCEN (CN)
WANG PING (CN)
Application Number:
PCT/CN2022/076844
Publication Date:
January 05, 2023
Filing Date:
February 18, 2022
Export Citation:
Assignee:
UNIV CHONGQING POSTS & TELECOM (CN)
International Classes:
H04J3/06; H03H17/02; H04L27/00; H04W84/18
Domestic Patent References:
| WO2021118675A1 | 2021-06-17 |
Foreign References:
| CN113452466A | 2021-09-28 | |||
| CN113438726A | 2021-09-24 | |||
| CN113438045A | 2021-09-24 | |||
| CN110460553A | 2019-11-15 |
Other References:
YU FEI: "Study on Parameter Estimation Methods for Clock Synchronization with Timestamp Free Exchanges in Wireless Sensor Networks", CHINA MASTER'S THESES FULL-TEXT DATABASE, INFORMATION TECHNOLOGY, 20 June 2020 (2020-06-20), pages 1 - 67, XP093016017, DOI: 10.27675/d.cnki.gcydx.2020.000234
WANG, HENG ET AL.: ""Clock Skew Estimation for Timestamp-Free Synchronization in Industrial Wireless Sensor Networks"", "IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS", vol. 17, no. 1, 31 January 2021 (2021-01-31), XP011818858, ISSN: 1551-3203, DOI: 10.1109/TII.2020.2975289
LI MAX; GVOZDENOVIC STEFAN; RYAN ALEXANDER; DAVID RADU; BROWN D. RICHARD; KLEIN ANDREW G.: "A real-time implementation of precise timestamp-free network synchronization", 2015 49TH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS, IEEE, 8 November 2015 (2015-11-08), pages 1214 - 1218, XP032874440, DOI: 10.1109/ACSSC.2015.7421334
WANG, HENG ET AL.: ""Clock Skew Estimation for Timestamp-Free Synchronization in Industrial Wireless Sensor Networks"", "IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS", vol. 17, no. 1, 31 January 2021 (2021-01-31), XP011818858, ISSN: 1551-3203, DOI: 10.1109/TII.2020.2975289
LI MAX; GVOZDENOVIC STEFAN; RYAN ALEXANDER; DAVID RADU; BROWN D. RICHARD; KLEIN ANDREW G.: "A real-time implementation of precise timestamp-free network synchronization", 2015 49TH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS, IEEE, 8 November 2015 (2015-11-08), pages 1214 - 1218, XP032874440, DOI: 10.1109/ACSSC.2015.7421334
Attorney, Agent or Firm:
TIDYTEND INTELLECTUAL PROPERTY LAW FIRM (CN)
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