Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1997-07-02
2000-09-19
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
G01S 502
Patent
active
061219215
ABSTRACT:
A position detection apparatus is disclosed which comprises: a GPS receiver for receiving at least a GPS radio wave signal, calculating and outputting position data from at least the GPS signal received; a PWR SUPP for supplying a PWR to the GPS receiver; a SW for controlling supplying the PWR to the GPS receiver; a timer; and a control portion for operating the SW to supply the PWR to the GPS receiver periodically using the timer and the SW, for detecting whether the position data Is outputted by the GPS receiver for a predetermined interval from when the PWR is supplied using the timer, and for operating the SW to stop supplying the PWR to the GPS receiver when the position data is not outputted by the GPS receiver for the predetermined interval. The control portion stores the position data from the GPS receiver and reads and outputs the latest position data in response to a position data request. Scanning a PRN signal in the GPS signal with a PRN signal generated therein with a range determined by a total continuous PWR OFF period. In the cyclic PWR ON operation, the cycle is controlled by an externally input signal. An intermittent receiving operation may be effected when the position data is not outputted by the GPS receiver because more than a predetermined number of GPS signals are not received.
REFERENCES:
patent: 5101416 (1992-03-01), Fenton et al.
patent: 5491486 (1996-02-01), Welles, II et al.
patent: 5592173 (1997-01-01), Lau et al.
patent: 5650785 (1997-07-01), Rodal
patent: 5703598 (1997-12-01), Emmons
Issing Gregory C.
Matsushita Electric - Industrial Co., Ltd.
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