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2014/10/15 ¤U¤È 10:03:41
iphone Programming Glossary: antennaBluetooth LE RSSI for proximity detection iOS http://stackoverflow.com/questions/15687332/bluetooth-le-rssi-for-proximity-detection-ios fair period of time two things have helped us calibrate this better. We did have to wrap a simple kalman filter on the antenna orientation and the IMU to get a rough running commentary though and this is not very CPU or battery light. Using the IMU..
BSD Sockets don't behave in a iPhone 3G environment http://stackoverflow.com/questions/2488634/bsd-sockets-dont-behave-in-a-iphone-3g-environment many times while developing for an iPhone 3G BSD socket functions will simply fail. I also noticed at the time the 3G antenna wasn't even ON nor was there WIFI Access to back up the network call So it seems ridiculous that it doesn't turn on to support..
iOS: Can I manually associate wifi network with geographic location? http://stackoverflow.com/questions/6341547/ios-can-i-manually-associate-wifi-network-with-geographic-location to know where shop X is. Probably there is no GPS signal and if you install a GPS repeater you get the position of the antenna of that repeater not your position. Even if you install a dozen Wi Fi access points you can't ask the user to manually connect..
What is the range of bluetooth and is it strictly 1:1? http://stackoverflow.com/questions/658899/what-is-the-range-of-bluetooth-and-is-it-strictly-11 things use 2.4 GHz. WiFi for example can cause problems. Antenna design Space and cost constraints often mean that the antenna design is sub optimal. I don't know how good the iPhone is in this respect. Walls Generally walls attenuate Bluetooth signals...
how to get distance using Wi-Fi http://stackoverflow.com/questions/684781/how-to-get-distance-using-wi-fi fixed if you're looking for instantaneous measurements a single fixed base station the access point an omnidirectional antenna on the receiver 802.11 b g protocol This cannot be done. Even if you were working at the PHY level this is an impossible..
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