3 meters! really! 在 2016年7月3日星期日 UTC+8上午11:51:35，gjs写道： > > "... method is feasible to do the collision avoidance job or not?" > > Probably NOT. Consider vehicles travelling in opposite directions on a two > lane road. Even with perfect instantaneous communications between any two > oncoming vehicles, the inaccuracy in smartphone GPS position (lat, lon) of > roughly 3 meters in good circumstances, would mean that your project would > likely be reporting incorrectly, that nearly every passing vehicle was > going to be involved a head on collision. > > To have any confidence in your project smartphone GPS position would need > to be accurate to within 10 centimeters or less. > > On Saturday, July 2, 2016 at 12:47:52 PM UTC+10, 吴梦飞 wrote: >> >> Recently I'm doing a project about broadcast my location infos (latitude, >> longitude, bearing and speed) from gps module in smartphone, then ppls >> or drivers who are closer to each other could get the distance and avoid >> the collision(Actually part of the VANET). I wanna use the Wi-Fi Direct >> to broadcast these infos without establishing connections among the >> devices. Just fill the infos into the name of Wi-Fi Direct ssid. Then a >> problem occurs that the delay is really long. When I switched on the Wifi >> Direct of one device, another one could find it after about 1 second. >> However it’s not enough when comes to the vehicular network. This problem >> became more terrible when changing the device name periodically. If anyone >> can tell me whether this method is feasible to do the collision avoidance >> job or not? If there are some better ways using android smartphones? Thanks >> a lot! >> >
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