{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8542718","patent":{"patent_number":"US-8542718","title":"Method and apparatus for acquisition, tracking, and sub-microsecond time transfer using weak GPS/GNSS signals","assignee":null,"inventors":[],"filing_date":"2012-11-06T00:00:00.000Z","publication_date":"2013-09-24T00:00:00.000Z","cpc_codes":["G01S","G01S","G01S"],"num_claims":20,"abstract":"A method and apparatus provide high-sensitivity GPS/GNSS signal acquisition in a stationary GPS/GNSS receiver. The uncertainty in frequency due to apparent Doppler shift is partitioned into a plurality of contiguous frequency bins, and the uncertainty in location of navigation data bit boundaries is partitioned into equally spaced trial bit boundary locations. For each combination of the trial bit boundary location and the frequency bin, a signal block of captured complex baseband signal is Doppler-compensated using a phase rotator, and then synchronously summed with a periodicity of one period of C/A code so as to produce a compressed sample block having N samples. Each compressed sample block is cross-correlated with one period of reference C/A code to produce an N-value correlation function. A predetermined number of magnitudes of the N-value correlation functions are stack-accumulated into an array with precession compensation so as to find a correlation peak having the largest value."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Method and apparatus for acquisition, tracking, and sub-microsecond time transfer using weak GPS/GNSS signals","description":"A method and apparatus provide high-sensitivity GPS/GNSS signal acquisition in a stationary GPS/GNSS receiver. The uncertainty in frequency due to apparent Doppler shift is partitioned into a pluralit","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8542718","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-8542718","citation_suggestion":"Patentable. \"Method and apparatus for acquisition, tracking, and sub-microsecond time transfer using weak GPS/GNSS signals\" (US-8542718). https://patentable.app/patents/US-8542718","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8542718","json":"https://patentable.app/api/llm-context/US-8542718","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T05:04:13.183Z"}