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gps speedometer and odometer
The distance odometer displayed above in navigation is the length of the road in the map data installed in the navigator, which is affected by the accuracy of map acquisition and manual production, and deviates from the actual situation; The mileage odometer displayed on the car dashboard is the rolling distance of the wheels, which indicates the actual distance your car has traveled.The distance displayed by GPS navigation is different from that on the car dashboard, which should be normal. The distance on the dashboard is the actual distance of the car, which is relatively accurate. The distance displayed by GPS navigation is the weighted approximate distance before navigation; The GPS track distance after navigation includes the distance generated by a large number of GPS positioning point drift.Therefore, the GPS track distance is generally greater than the distance on the instrument panel. The speed indicated by the navigation is different from the actual instrument speed. Generally, GPS is used for navigation to test the speed of the car when it is driving, and the code meter is used to test the speed of the car when it is driving with a wheel tester. The speed measurement methods of the two are different. From the surface, it seems that the code meter measures the speed according to the actual situation, and the data should be more accurate, but in fact, it is not.
GPS speedometer and car odometer:
There are errors in the display of speed per hour. Although GPS is affected by the environmental signal at that time, the displayed speed will be unstable, but the error will be smaller. Generally, the error is about 2-3 yards, and the displayed speed is relatively accurate. Because of the car's own speedometer, the car code meter will be designed from the normal safety range. The display of the code meter will be higher than the actual speed, with an error of about 3-5 yards. The meter displays faster than the actual speed. This is to remind the car owner not to overspeed, so as to better avoid speeding at the critical point. There must be a few percentage error between the displayed speed and the actual speed, which is stipulated by the state
1. GPS recorder records the driving path, and calculates the straight-line distance between two points according to the longitude and latitude of each positioning. The actual driving is much more complicated than positioning.
2. The automobile odometer calculates the mileage according to the diameter of the wheel and the number of turns of the wheel. There is basically no error in the actual mileage, which is very accurate.
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