| 摘要 |
Position-detecting apparatus comprises a GPS antenna (1), preferably of microstrip type, for receiving radio waves transmitted by global positioning system satellites, the antenna (1) being mounted on a support structure (3, 6, 13, 14, 15, 16, 17) for supporting the antenna (1) at a selected survey point, and reflective means (8), for use in an optical surveying method, mounted on the said support structure (3, 6, 13, 14, 15, 16, 17) so as to be rotatable with respect thereto about a vertically-extending first axis (15) and a horizontally-extending second axis (17). <IMAGE> |
