Patent ID: 6559795
Filing Date: 2003-05-06
Classification: G01S

Abstract:
A method of high-sensitivity operation of a navigation satellite receiver that can connect to a server over a network, the method comprising the steps of:measuring each satellite vehicles (SV's) received signal strength; classifying each measured SV's signal strength according to strong, medium, and weak; if said SV signal strength is classified as strong, then downloading NAV-data from a corresponding SV to collect ephemeris, z-count and navigation data bit transition time (BTT); if said SV signal strength is classified as medium, then using NAV-data pattern matching to get a z-count or integer millisecond, and fetch a corresponding ephemeris from a server; if said SV signal strength is classified as weak, fetching both NAV-data and ephemeris from said server; and computing a navigation fix.