Trimble Inc.
Survey system with field calibration

Abstract:

A survey system configured to perform a calibration that eliminates, or at least significantly reduces, mechanical misalignment issues with the receiver or top unit (e.g., a GNSS receiver or the like), the mounting hardware, and the survey pole of the survey system. The survey system may include a data collector mounted upon the pole, and a calibration module (i.e., calibrating software and/or firmware) may be run or provided on the data collector or other component of the survey system (e.g., on the top unit). The calibration module processes data collected (including data from its inertial measurement unit (IMU)) by the top unit during calibration operations (or simply calibration) to determine a mounting angle and a correction factor (or corrections for attitude) based on this mounting angle, and the correction factor is communicated to the top unit for use in later data collection to improve accuracy of the survey system.