Method and system for processing positioning signals based on predetermined message data segment

摘要

A method and system for determining a geolocation of an object includes collecting a positioning signal including a predetermined message data segment. A time of arrival of the predetermined message data segment may be determined in the positioning signal. Information based on the time of arrival may be provided for determination of a geolocation of an object. The time of arrival of the predetermined message data segment may be determined based on a time search for the predetermined message data segment in the positioning signal.

主权项

1. A method for synchronizing a time setting of a clock in a receiver with a Global Positioning System (GPS) time in a clock of each of a plurality of satellites, comprising:
recording a predetermined segment of a signal received from each of at least four satellites; establishing a time of arrival of a predetermined message data sequence in each received signal; determining a time difference of arrival for at least three pairs of satellites; computing a location of the receiver from the time difference of arrival; locating a HOW word in the received signal preceding the predetermined message data segment; extracting a GPS time from the HOW word; identifying a GPS time of transmission from each satellite of the predetermined message data sequence from the extracted GPS time and a separation between the HOW word and the predetermined message data segment; calculating a propagation time of the signal from each satellite to the receiver based on the location of the satellites and the location coordinates of the receiver; obtaining GPS time of receipt at the receiver of the predetermined message data sequence from the propagation time and the GPS time of transmission; formulating a receiver clock error from the GPS time of receipt and the time of arrival for a given satellite.