Method for obtaining correct phase inversion points in...

Details Method for obtaining correct phase inversion points in... Method for obtaining correct phase inversion points in...

2011-03-29

2011-03-29

Tarcza, Thomas H (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C342S357490, C342S357670, C342S357690

Reexamination Certificate

active

07916077

ABSTRACT:
A method for obtaining correct phase inversion points in a signal of global positioning system (GPS) includes the following steps. A satellite signal from one of a plurality of satellites is received continuously. A plurality of phase inversion points in the received satellite signal is interpreted. Each time difference between each two adjacent phase inversion points among the plurality of phase inversion points is calculated. It is determined whether each of the time differences is an integral multiple of 20 milliseconds. A data is retrieved every 20 milliseconds from the satellite signal by using a first phase inversion point in the plurality of phase inversion points as a starting point when each of the time differences is an integral multiple of 20 milliseconds. By finding out a plurality of correct phase inversion points in the satellite signal, the positioning speed is increased, and thus a positioning time required is reduced.

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