Signal receiving method for a user's device in a global position

Details Signal receiving method for a user's device in a global position Signal receiving method for a user's device in a global position

1989-06-19

1990-05-22

Tarcza, Thomas H.

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

Directive

Including a satellite

342451, 364449, G01S 502, H04B 7185, G01C 2100

Patent

active

049281070

ABSTRACT:
In a user's device of a GPS, the calculation of GDOP values for determining satellites to be used for the positioning is initiated periodically with a predetermined operation period. Once they are determined in a certain operation period, the processing for the positioning is repeatedly executed on the basis of signals from the determined satellites through the operation period, until satellites to be used are determined in a succeeding operation period. Plural times of the positioning can be executed for every time of the calculation of a GDOP value. If, therefore, a frequency of executing the positioning are made almost as equal as conventionally, a frequency of carrying out the time-consuming calculation of GDOP values is decreased, whereby the load of a microprocessor in the user's device can be remarkably reduced.

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