{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9590740","patent":{"patent_number":"US-9590740","title":"Method and system for robust symmetrical number system photonic direction finding","assignee":null,"inventors":[],"filing_date":"2015-10-21T00:00:00.000Z","publication_date":"2017-03-07T00:00:00.000Z","cpc_codes":["H04B","G01S","H04B","H04B","H04B"],"num_claims":7,"abstract":"A four-element wideband photonic DF system with robust symmetrical number system preprocessing utilizes dual electrode Mach-Zehnder modulators (DE-MZMs) to conduct phase detection for direct wideband direction finding (DF) of RF signals, such as microwave signals, in which the normalized magnitude of the output signal phase detector circuit is equal to |sin(φ/2)| where φ is the phase difference between the plane waves arriving at the reference and measurement antennas of a linear DF array. The method and system allow fine angular resolution using a much smaller array size than is typically required for linear arrays employing super-resolution signal processing techniques."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Method and system for robust symmetrical number system photonic direction finding","description":"A four-element wideband photonic DF system with robust symmetrical number system preprocessing utilizes dual electrode Mach-Zehnder modulators (DE-MZMs) to conduct phase detection for direct wideband ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9590740","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-9590740","citation_suggestion":"Patentable. \"Method and system for robust symmetrical number system photonic direction finding\" (US-9590740). https://patentable.app/patents/US-9590740","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9590740","json":"https://patentable.app/api/llm-context/US-9590740","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T04:09:11.855Z"}