Patent ID: 7925466

Claim:
A speed measuring system for measuring the speed of a wireless communication terminal communicating with a base station, the base station comprising a signal tower, an antenna configured in a horizontal plane on the signal tower, the signal tower defining a central longitudinal axis perpendicular to the antenna, and the axis intersecting the antenna at a point, the system comprising: an angle measuring unit configured for measuring a first included angle between a longitudinal direction of a signal wave emanating from a first location of the wireless communication terminal and a longitudinal direction of the antenna at the point, and a second included angle between a longitudinal direction of a signal wave emanating from a second location of the wireless communication terminal and the longitudinal direction of the antenna at the point; a distance measuring unit configured for measuring a first distance between the wireless communication terminal at the first location and the point and a second distance between the wireless communication terminal at the second location and the point; a time measuring unit configured for measuring the time the wireless communication terminal takes to move from the first location to the second location; and a speed calculator configured for calculating the speed of the wireless communication terminal moving from the first location to the second location using the following formula: V = E a 2 + E b 2 - 2 ⁢ E a ⁢ E b ⁢ cos ⁡ ( θ b - θ a ) t , where V is designated as the speed, E a is designated as the first distance, E b is designated as the second distance, θ a is designated as the first included angle, θ b is designated as the second included angle, and t is designated as the time the wireless communication terminal takes to move from the first location to the second location.