Satellite positioning apparatus and method

Details Satellite positioning apparatus and method Satellite positioning apparatus and method

2007-11-13

2007-11-13

Tarcza, Thomas H. (Department: 3662)

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

Directive

Including a satellite

C342S464000, C701S213000, C701S214000, C340S988000

Reexamination Certificate

active

11073024

ABSTRACT:
Available-satellite data indicating satellites available for satellite positioning is obtained from a GPS receiver, and satellites continuously available for satellite positioning in the current instance and the previous n times are extracted as candidate satellites referring to available-satellite record data. Four of the candidate satellites are selected so that the satellites used for satellite positioning the previous time are selected with priority as the satellites to be used for satellite positioning in the current instance, and the selected satellites are set in designated-satellite data. The GPS receiver performs three-dimensional positioning using the four satellites designated by the designated-satellite data. If the number of extracted candidate satellites is three, these three extracted candidate satellites are selected as the designated satellites and are set in the designated-satellite data. The GPS receiver performs two-dimensional positioning using these three designated satellites. If the number of extracted candidate satellites is smaller than three, satellite positioning is not performed.

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