Well, the dust and sand raised by the Xiaomi conference yesterday in Shenzhen are gradually settling but there are still some little pending details of that event. One of the innovative features of the Xiaomi Mi 8 is its dual-band GPS. This is the first smartphone in the world to use a dual-band GPS for super-precision positioning. Now, a test of the Xiaomi Mi 8’s GPS showed amazing results.
In the open environment, a GPS deviation mainly comes from a delay of the signal through the ionosphere. Xiaomi Mi 8 uses the L1+L5 dual-frequency dual-channel positioning, which can effectively correct the ionosphere delay. The error of L1 band is 300 meters in theory while that of the L5 band is 30 meters. L5 is 10 times more accurate than L1, which effectively solves the reflection interference of urban buildings.
At yesterday’s press conference, Lei Jun said that Xiaomi Mi 8 took the lead in adopting the dual-frequency GPS technology, which actually improved the accuracy of positioning by at least 3-5 times. This is called “Road Dementia.” In order to show the ultra-precision of the dual-frequency GPS of the Xiaomi Mi 8, Xiaomi conducted an extreme test of this phone in a car with all the windows blacked out. A narrow lane was created and a driver had to drive the car through the lane to a parking lot. The driver had no view since all the windows were blacked out and he had to rely strictly on the Xiaomi Mi 8 GPS.
Since the lane is completely invisible to the driver, it requires that the positioning accuracy of the Mi 8 navigation must be extremely high without any deviation for the driver to succeed. In the end, with the dual-frequency GPS positioning of the Xiaomi Mi 8, the test car passed successfully with precise alignment, and the vehicle did not encounter any obstacles. See some images of the test below