Some frequently asks: previously bought a car known as inertial navigation technology , is interesting that not too many cars in the tunnel where the vehicle stopped , the icon shows still moving forward , is that true inertial navigation technology it?android dvd navigation
Re: Actually , GPS has occurred because the signal is weak or inaccurate interference obstacles arise. Not only in the tunnel , we often encounter in downtown , GPS signals are lined with tall buildings refraction, reflection can also occur when the drift .
In addition, the complex viaduct or in the shade of dense track, the signal will be masking live , GPS signal also appears disorders.car GPS dvd navigation system
Currently effective solution to this problem is popular inertial technology on the market.
GPS inertial navigation technology in the field of a wide range of military applications, such as in 1958 , the U.S. " Nautilus " submarine relies on inertial navigation sailing through the Arctic ice in 21 days . Now, the civilian inertial navigation products with precise gyro and vehicle speed pulse projection system , and the formation of vehicle location latitude and longitude information, and locate and map matching .
In the process of moving , always based on inertial navigation signals will be mainly fusion , GPS satellite signal is only secondary correction , when the GPS signal is lost GPS signal or a bad case , the navigator can continue to navigate , good inertial navigation technology can be sustained ten minutes , or even longer.
You said that the situation is the moment you enter the tunnel extrapolated speed , so your car parked it continues to go this inertial technology is not in the true sense .
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