Unformatted text preview: There are certain places that the GPS signals are not available and the Wi-Fi signals are also not available; therefore, it’s very hard to locate where exactly the smart card is. In case of emergency, the rescue squad will take longer time to get to the place because of the unknown location. Nevertheless, the updating period of the location is also another concern. We have to decide when would be the perfect updating period; we don’t want to update it very often because it would cost a lot of power, but if we don’t update often, the location will not be accurate....
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- Spring '08
- Global Positioning System, smart card, The Unknown, perfect updating period