{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9846240","patent":{"patent_number":"US-9846240","title":"Multi-level/multi-threshold/multi-persistency GPS/GNSS atomic clock monitoring","assignee":null,"inventors":[],"filing_date":"2014-06-24T00:00:00.000Z","publication_date":"2017-12-19T00:00:00.000Z","cpc_codes":["G01S","G01S","G01S","G01S","G01S","H04L"],"num_claims":20,"abstract":"Methods and apparatus to monitor GPS/GNSS atomic clocks are disclosed. An example method includes establishing a measured difference between an atomic frequency standard (AFS) and a monitoring device. The method also includes modeling an estimated difference model between the AFS and the monitoring device, and computing a residual signal based on the measured difference and the estimated difference model. In addition, the method includes analyzing, by a first detector, the residual signal at multiple thresholds, each of the thresholds having a corresponding persistency defining the number of times a threshold is exceeded before one or more of a phase jump, a rate jump, or an acceleration error is indicated. Furthermore, the method includes analyzing, by a second detector, a parameter of the estimated difference model at multiple thresholds, each of the thresholds having a corresponding persistency defining the number of times a drift threshold is exceeded before a drift is indicated."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Multi-level/multi-threshold/multi-persistency GPS/GNSS atomic clock monitoring","description":"Methods and apparatus to monitor GPS/GNSS atomic clocks are disclosed. An example method includes establishing a measured difference between an atomic frequency standard (AFS) and a monitoring device.","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9846240","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9846240","citation_suggestion":"Patentable. \"Multi-level/multi-threshold/multi-persistency GPS/GNSS atomic clock monitoring\" (US-9846240). https://patentable.app/patents/US-9846240","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9846240","json":"https://patentable.app/api/llm-context/US-9846240","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:00:29.768Z"}