Method for compensating an error of a digital magnetic compass associated with a sight device

The method enhances the accuracy of terrestrial observation devices by using common sensors to correct orientation errors through user-interactive mapping-image corrections, addressing magnetic field disturbances in digital magnetic compasses.

WO2026013016A1 Publication Date: 2026-01-15VECTRONIX AG
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Patent Information

Application Number
PCT/EP2025/069371
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-07-09
Filing Date
2025-07-08
Publication Date
2026-01-15

AI Technical Summary

Technical Problem

Existing terrestrial observation devices suffer from inaccuracies in determining the orientation of the sight axis due to magnetic field disturbances, which conventional calibration methods struggle to effectively compensate for, especially when using digital magnetic compasses.

Method used

A method that utilizes a terrestrial observation device equipped with a viewing member, range finder, orientation-measuring member, display unit, and electronic processing unit to display a mapping-image, allowing users to correct the orientation of the sight axis by identifying landmarks and applying correction parameters based on geographic coordinates, thereby compensating for magnetic field errors without additional sensors.

Benefits of technology

Improves the accuracy of measuring the orientation of the sight axis by leveraging common sensors in standard observation devices, enhancing precision through user-interactive mapping-image corrections.

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Abstract

Method for calibrating a terrestrial observation device (1) comprising a viewing member (3) defining a sight axis, a range finder (6) for determining a distance from a reference point being located on the sight axis, an orientation-measuring member (7) for measuring the orientation of the sight axis to determine a current orientation of the sight axis, a display unit (4) and an electronic processing unit (5). The method comprises the steps, commanded by the processing unit, of: displaying a mapping-image on the display unit, corresponding to a current position of the observation device; representing the current position and the sight axis from the current orientation on this mapping-image; having a user indicate, on the mapping-image, the reference point aimed at with the range-finder, and determining the position of the reference point indicated by the user on the mapping-image; and deducing from this, a correction parameter of the current orientation of the sight axis. Terrestrial observation device for implementing that method.
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