Total Station GNSS Lecture Notes PDF

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Summary

Lecture Notes...

Description

Total Station Total station is a combination of electronic digital theodolite, an EDM to measure distances and a computer processing unit

Uses -

Measures horizontal and vertical angles Measures slope distances Outputs true horizontal angles Outputs true vertical angles Stores the measures and calculated data

Features -

Dual axis compensator that corrects vertical axis tilt Dual axis compensator that corrects dislevelment of trunnion axis Collimation error corrections for both horizontal and vertical

GNSS uses a spherical coordinate system which needs to convert from GNSS coordinates to local, because Civil Engineers work on the plane and therefore require a flat coordinate system, allowing for clock errors, atmospheric refraction, and multipath. Multipath Errors occur due to GNSS signals arriving at the receiver after being reflected from an object/building surface. In Civil Engineering, GNSS is useful in surveying. Differential carrier positioning using two GNSS receivers (One to calculate errors and the other to calculate position) provides data with a 1-2cm accuracy, allowing Engineers to create large-scale, detailed surveying maps. However, Total Stations and Levelling is a more accurate yet strenuous data collection method....