| 摘要 |
PROBLEM TO BE SOLVED: To easily calculate the height of an antenna from a measuring point of a height measuring device, by installing an angle measuring device at the position any distance away from the post of an arm fixed to it, and measuring the angle between horizontal or vertical direction and the direction of a collimated object. SOLUTION: An antenna height measuring device includes a plumbing device 31 which has a receiving antenna 11 fixed to its top, an antenna fixing post 41, an angle measuring device 55, and an arm 53 which connects the device 55 to the post 41. The angle measuring device 55 collimates a measuring point 80, and immediately measures an angle a between the direction of the measuring point 80 and axial direction of the arm 53, horizontal direction, or an angleβbetween the direction of the measuring point 80 and the vertical direction. Based on the anglesα,βand an offset value L, height Hb from the measuring point 80 to the angle measuring device 55 is derived by Hb=L×tanα=L×tan(90 deg.-β). The height H from the measuring point 80 to the antenna phase center 15 is derived by adding set height Hc to Hb as shown by H=Hb+Hc.
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