Survey rod and auxiliary sensor unit with annular form

The invention relates to a surveying rod and an auxiliary sensor unit having an annular form. The invention relates to a surveying rod (1) and an auxiliary sensor unit (2) attachable to the surveying rod (1). A reflector (10) and/or GNSS receiver attachable to the surveying rod (1) may be attached irrespective of whether the auxiliary sensor unit (2) is attached to the surveying rod (1). The distance between the reflector (10) and/or GNSS receiver and the rod tip (12) is also independent of whether the auxiliary sensor unit (2) is attached to the survey rod (1). The distance between the attached reflector (10) and/or GNSS receiver and the attached auxiliary sensor unit (2) is also known and fixed. The invention also relates to a method and a computer program product for numerical correction of distance measurement errors due to the orientation and position of a reflector (10) relative to a main sensor (14), in particular a stadia. 本发明涉及一种具有环形形式的勘测杆和辅助传感器单元。本发明涉及一种勘测杆(1)和可附接到该勘测杆(1)的辅助传感器单元(2)。可附接到勘测杆(1)的反射器(1