{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9702960","patent":{"patent_number":"US-9702960","title":"Frequency difference of arrival (FDOA) for geolocation","assignee":null,"inventors":[],"filing_date":"2013-07-19T00:00:00.000Z","publication_date":"2017-07-11T00:00:00.000Z","cpc_codes":["G01S","G01S","G01S","G01S","G01S","G01S"],"num_claims":13,"abstract":"A method for determining a FDOA of a pulsed waveform received by two sensors includes obtaining a respective plurality of in-phase and quadrature-phase (IQ) samples indicative of a pulse envelope of the received pulsed waveform. The method includes determining a TDOA responsive to a leading edge of a pulse of the pulsed waveform and obtaining a first cross correlation of IQ samples at a delay (dc) closest to the TDOA, and respective second and third cross correlations at least one additional delay (dc+1 and dc−1) on either side of the closest delay. The method includes refining the approximation of the TDOA according to an interpolation of amplitudes of the cross-correlation and determining a respective rate of change of cross-correlation phase (Δφ). The method includes approximating a straight line fit to the rates of change of cross-correlation phase (dΔφ/dt), the slope of the straight line representative of the FDOA."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Frequency difference of arrival (FDOA) for geolocation","description":"A method for determining a FDOA of a pulsed waveform received by two sensors includes obtaining a respective plurality of in-phase and quadrature-phase (IQ) samples indicative of a pulse envelope of t","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9702960","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-9702960","citation_suggestion":"Patentable. \"Frequency difference of arrival (FDOA) for geolocation\" (US-9702960). https://patentable.app/patents/US-9702960","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9702960","json":"https://patentable.app/api/llm-context/US-9702960","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:28:07.991Z"}