Position detection apparatus
First Claim
1. A position detection apparatus comprising:
- a GPS receiver, including an antenna, for receiving at least a GPS radio wave signal, calculating and outputting position data from at least said GPS signal received;
a power supply for supplying a power to said GPS receiver;
a switch for controlling supplying said power to said GPS receiver;
a timer; and
control means for operating said switch to supply said power to said GPS receiver periodically using said timer and said switch, for detecting whether said position data is outputted by said GPS receiver for a predetermined interval from when said power is supplied using said timer, and for operating said switch to stop supplying said power to said GPS receiver when said position data is not outputted by said GPS receiver for said predetermined interval at the latest.
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Accused Products
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.
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Citations
7 Claims
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1. A position detection apparatus comprising:
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a GPS receiver, including an antenna, for receiving at least a GPS radio wave signal, calculating and outputting position data from at least said GPS signal received; a power supply for supplying a power to said GPS receiver; a switch for controlling supplying said power to said GPS receiver; a timer; and control means for operating said switch to supply said power to said GPS receiver periodically using said timer and said switch, for detecting whether said position data is outputted by said GPS receiver for a predetermined interval from when said power is supplied using said timer, and for operating said switch to stop supplying said power to said GPS receiver when said position data is not outputted by said GPS receiver for said predetermined interval at the latest. - View Dependent Claims (2, 3, 4, 5)
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6. A position detection apparatus comprising:
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a GPS receiver for receiving a plurality of GPS signals and for calculating and outputting position data from said received plurality of GPS signals when more than a predetermined number of GPS signals are received; a power supply for supplying a power to said GPS receiver; a switch for controlling supplying said power to said GPS receiver; a timer; and control means for operating said switch to supply said power to said GPS receiver using said switch, for detecting whether said position data is outputted by said GPS receiver for a predetermined interval from when said power is supplied using said timer, and for effecting an intermittent receiving operation using said timer and said switch when said position data is not outputted by said GPS receiver for said predetermined interval until said GPS receiver outputs said position data. - View Dependent Claims (7)
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Specification