First output position calculation method, storage medium,...

Details First output position calculation method, storage medium,... First output position calculation method, storage medium,...

2008-04-03

2009-11-03

Phan, Dao L (Department: 3662)

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

Directive

Including a satellite

C342S357490, C342S357490

Reexamination Certificate

active

07612713

ABSTRACT:
In the first positioning, a positioning process that calculates the present position based on acquired GPS satellite signals (step A3) is performed a plurality of times. A number of times that the difference (position difference) ΔP between the calculated present located position and the preceding located position is successively equal to or less than a given value is counted using a position counter, and a number of times that the difference (time difference) ΔT between the present time error and the preceding time error is successively equal to or less than a given value is counted using a time counter each time the positioning process is performed (step A5). A position threshold value and a time threshold value are determined by changing a reference threshold value by an amount corresponding to an APR average value (step A7). When the position count value has reached the position threshold value (step A9: YES) and the time count value has reached the time threshold value (step A11: YES), the present position is determined to be the first located position and output (step A13).

REFERENCES:
patent: 2003/0156058 (2003-08-01), Edwards et al.
patent: 2003-240836 (2003-08-01), None

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