Method and system for reducing autonomous time to fix a multi-standard GNSS receiver

摘要

A multi-standard GNSS receiver, handle different global navigation satellite systems (GNSSs), determines with respect to a current time instant, the earliest broadcast timing based on corresponding satellite broadcast cycles for satellites in the different GNSSs. The multi-standard GNSS receiver acquires broadcast ephemeris at the determined earliest broadcast timing to determine its own first position. A search order is determined based on the corresponding satellite broadcast cycles and the current time instant. The multi-standard GNSS receiver may selectively utilize appropriate satellite receivers such as the GPS receiver and the GLONASS receiver to search for satellite signals based on the determined search order. Channels for different GNSSs are scanned to identify transmitting satellites based on the corresponding satellite broadcast cycles for ephemeris downloading. The satellite search is prioritized by comparing the current time instant with the corresponding satellite broadcast cycles.

主权项

1. A method for processing signals in a multi-standard global navigation satellite system (GNSS) receiver associated with a plurality of global navigation satellite systems, the method comprising:
determining a search order for a plurality of satellites included in the plurality of global navigation satellite systems based on a current time instant and satellite broadcast cycles of the plurality of satellites; searching among the plurality of satellites in accordance with the determined search order to identify a satellite from among the plurality of satellites from which ephemeris data is to be received based on the current time instant and on the satellite broadcast cycles; acquiring the ephemeris data from the identified satellite; and determining a position of the GNSS receiver based on the acquired ephemeris data.