GPS reception system
First Claim
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1. A GPS reception system including a GPS receiver having a built-in antenna and an external antenna made connectable to the GPS receiver, the system comprising an antenna switching unit which switches between the built-in antenna and the external antenna, wherein the antenna switching unit is adapted to detect when the external antenna is connected to the GPS receiver and thereafter switch a receiving antenna from the built-in antenna to the external antenna.
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Abstract
A GPS reception system is provided in which, when sufficient reception level for positioning cannot be obtained only by a built-in antenna, a reception antenna is switched from the built-in antenna to an external antenna.
16 Citations
10 Claims
- 1. A GPS reception system including a GPS receiver having a built-in antenna and an external antenna made connectable to the GPS receiver, the system comprising an antenna switching unit which switches between the built-in antenna and the external antenna, wherein the antenna switching unit is adapted to detect when the external antenna is connected to the GPS receiver and thereafter switch a receiving antenna from the built-in antenna to the external antenna.
- 6. A GPS reception system comprising a GPS receiver having a built-in antenna and an external antenna made connectable to the GPS receiver, the system characterized by comprising a reception level detecting unit which measures a reception level of the built-in antenna and that of the external antenna and compares the measured reception levels with each other, and an antenna switching control unit which selects a reception antenna from measurement and comparison results of the reception levels obtained in the reception level detecting unit and carries out control of switching between the built-in antenna and the external antenna, and carrying out diversity reception with the built-in antenna and the external antenna.
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9. A GPS reception system including a GPS receiver having a built-in antenna and an external antenna made connectable to the GPS receiver, the system characterized by comprising a reception level detecting unit which measures a reception level of the built-in antenna and that of the external antenna and compares the measured reception levels with each other, and an antenna switching control unit which selects a reception antenna from measurement and comparison results of the reception levels obtained in the reception level detecting unit and carries out control of switching between the built-in antenna and the external antenna, and, of the built-in antenna or the external antenna, designating an antenna which provides a higher reception level as the reception antenna for each of the GPS satellites picked up.
Specification