National Yang Ming Chiao Tung University

Chia-Cheng Wang

Jyh-Cheng Chen

Ping-Fan Ho

Yu-Xin Xiao

A vehicular positioning method is provided for positioning a vehicle that is running on a road, where the road has a plurality of feature objects that have the same detectable feature and that are disposed along the road. The vehicle is provided with a system that counts a number of the feature objects the vehicle has passed by as the vehicle runs on the road, and that calculates a travelling distance the vehicle has traveled on the road based on the number counted thereby, an object length of the feature objects, and spacing between adjacent two of the feature objects. Then, the system displays an electronic map that shows the road and that indicates a position of the vehicle on the road based on the calculated travelling distance.

Vehicular positioning method and system

A method for determining a road type includes measuring, for a preset period, a magnetic field of an environment in which an electronic device is located to obtain a plurality of magnetic field values, calculating an absolute value of a difference between every two adjacent magnetic field values among the magnetic field values sorted in chronological order, calculating an average of the absolute values related to the magnetic field values to serve as a variation value for the environment, determining whether the variation value is smaller than a predetermined threshold value, determining that the environment is a surface road when the determination result is affirmative, and determining that the environment is a non-surface road when the determination result is negative.

Method and electronic device for determining road type

Pressure assisted positioning method and device thereof are disclosed in the present invention. The pressure assisted positioning device is exerted for positioning a target under the circumstance of altitude change since the target enters a specific region. The pressure assisted positioning method includes the following steps. First, confirming the entrance of the specific region of the target and detecting a plurality of pressure data. Then, calculating a pressure variation between the two selected pressure data. At last, comparing the pressure variation to a threshold. An altitude change within the specific region is confirmed as the pressure variation is greater than the threshold. On the other hand, as the pressure variation is greater than the threshold, it refers to no altitude change within the specific region. Wherein, confirming the entrance of the specific region of the target determines via the result of detecting the target enters a region having at least a distance with a reference location of a structure with altitude change illustrated according to a map information. The pressure assisted positioning device of the present invention can not only directly detect the actual pressure data but calibrate the pressure variation information according to the pressure data and the moving statuses of the target as well. Comparing to the conventional device, the method and device of the present invention can calculate and calibrate the pressure variation information independently without any external pressure data from the barometric station.

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Hsinchu, Taiwan

Chia-Cheng Wang