Method and Performance of Time Holdover for RT-PPT Receivers Utilizing on-line Estimation of Clock Parameters

Method and Performance of Time Holdover for RT-PPT Receivers Utilizing on-line Estimation of Clock Parameters | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Method and Performance of Time Holdover for RT-PPT Receivers Utilizing on-line Estimation of Clock Parameters Wenfei Guo, Qirui Gong, Mengmeng Zhu, Chuang Shi, Hongming Zuo This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4605279/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 20 Sep, 2024 Read the published version in GPS Solutions → Version 1 posted 9 You are reading this latest preprint version Abstract Real Time Precise Point Timing (RT-PPT) receivers can achieve sub-nanosecond accuracy through precise clock offset estimation and receiver clock discipline. However, when satellite signals are lost, the receiver clock drifts, causing timing errors due to clock noise and environmental factors. Strict autonomous holdover is therefore essential for high-precision timing receivers. This paper proposes a time holdover method based on online clock modelling. At the timing stage, the frequency bias compared to the time reference is estimated and eliminated by the closed control loop. Meanwhile, the recursive least square algorithm is used to estimate the parameters of the clock temperature and ageing effects online. In the event of signal interruption, the initial frequency bias is reduced by one-step prediction, while the clock offset caused by temperature and ageing is compensated for using the estimated parameters. To verify the validity of the method, real experiments were carried out using an RT-PPT receiver with different types of oscillators. The results show that with the method proposed in this paper, we can achieve holdover accuracy better than 1ns in 1h using a rubidium clock after correcting for the initial frequency bias, with an improvement of more than 67% over the free-running clock. And the holdover accuracy of the receiver using an OCXO after correcting for temperature and ageing is better than 1us in 24h, with a performance improvement of more than 70% over the free-running clock. RT-PPT holdover clock noise frequency accuracy Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 20 Sep, 2024 Read the published version in GPS Solutions → Version 1 posted Editorial decision: Revision requested 05 Aug, 2024 Reviews received at journal 30 Jul, 2024 Reviews received at journal 22 Jul, 2024 Reviewers agreed at journal 08 Jul, 2024 Reviewers agreed at journal 08 Jul, 2024 Reviewers invited by journal 08 Jul, 2024 Editor assigned by journal 07 Jul, 2024 Submission checks completed at journal 21 Jun, 2024 First submitted to journal 19 Jun, 2024 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4605279","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":325176652,"identity":"acbd68c9-5ee9-4780-bc2a-c7f0771c8d1d","order_by":0,"name":"Wenfei Guo","email":"","orcid":"","institution":"Wuhan University","correspondingAuthor":false,"prefix":"","firstName":"Wenfei","middleName":"","lastName":"Guo","suffix":""},{"id":325176653,"identity":"f0a4628a-fefc-47fb-b346-bcb65c98e9b0","order_by":1,"name":"Qirui Gong","email":"","orcid":"","institution":"Wuhan University","correspondingAuthor":false,"prefix":"","firstName":"Qirui","middleName":"","lastName":"Gong","suffix":""},{"id":325176655,"identity":"5607e95d-a0ff-4a09-8b5c-951b29565abc","order_by":2,"name":"Mengmeng Zhu","email":"","orcid":"","institution":"Wuhan University","correspondingAuthor":false,"prefix":"","firstName":"Mengmeng","middleName":"","lastName":"Zhu","suffix":""},{"id":325176658,"identity":"88cb0113-170e-4c6a-8db2-d3c1dbec0fde","order_by":3,"name":"Chuang Shi","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA6klEQVRIiWNgGAWjYDACCcYGZjCDvQcqcoBoLTxniNbCwADRIpFDpBb52c2Nnwvb7PLkI98ek/hRwyDHdyOB8XMBHi0Gdw42S89sSy42vJ2XJtlzjMFY8kYCs/QMfFokEtuYeduYEzfOzjGT4GFjSNxwI4GNmQefw2aAtdQnbpx5xkzyzz+GeoJaGG6AtRxOnC/BYybN28aQYEBIi8GNxGZpnnPHEzfw5CVby/ZJGM488xAogtdh6Q8/85RVJ85vP3vw5ptvNvJ8x5MPfsbrMLh1B8AUMJoYGBuI0QC0jkh1o2AUjIJRMAIBABE6SrVD9loHAAAAAElFTkSuQmCC","orcid":"","institution":"Beihang University","correspondingAuthor":true,"prefix":"","firstName":"Chuang","middleName":"","lastName":"Shi","suffix":""},{"id":325176659,"identity":"a440146e-22f7-4c80-bce5-38dec7c47da5","order_by":4,"name":"Hongming Zuo","email":"","orcid":"","institution":"Wuhan University","correspondingAuthor":false,"prefix":"","firstName":"Hongming","middleName":"","lastName":"Zuo","suffix":""}],"badges":[],"createdAt":"2024-06-19 10:39:57","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-4605279/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-4605279/v1","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1007/s10291-024-01748-x","type":"published","date":"2024-09-20T15:58:10+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":65104436,"identity":"644ba3ec-49c8-404f-880c-225b902651ab","added_by":"auto","created_at":"2024-09-23 16:13:23","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1021677,"visible":true,"origin":"","legend":"","description":"","filename":"MethodandPerformanceofTimeHoldoverforRTPPTReceiversUtilizingonlineEstimationofClockParameters.pdf","url":"https://assets-eu.researchsquare.com/files/rs-4605279/v1_covered_d46f1ce8-2aee-4913-8f49-e2e06ea8ffc4.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Method and Performance of Time Holdover for RT-PPT Receivers Utilizing on-line Estimation of Clock Parameters","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"gps-solutions","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"gpss","sideBox":"Learn more about [GPS Solutions](http://link.springer.com/journal/10291)","snPcode":"10291","submissionUrl":"https://submission.nature.com/new-submission/10291/3","title":"GPS Solutions","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"RT-PPT, holdover, clock noise, frequency accuracy","lastPublishedDoi":"10.21203/rs.3.rs-4605279/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4605279/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eReal Time Precise Point Timing (RT-PPT) receivers can achieve sub-nanosecond accuracy through precise clock offset estimation and receiver clock discipline. 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