Electronic Polar Scope Alignment Using Star Image Matching
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Solution Overview
Problem
Existing polar alignment methods for equatorial telescopes are cumbersome and prone to inaccuracies, requiring users to adjust the mount's altitude and azimuth while looking through a polar scope, which can be straining and difficult, especially in low positions, and often result in errors due to misalignment.
Innovation Solution
An electronic polar scope system that acquires star images and determines the celestial pole's location through computerized matching with a database, displaying symbols to guide the user in aligning the mount's right ascension axis with the celestial pole, allowing for accurate polar alignment without the need for manual reticle alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a user adjusts the mount's altitude and azimuth while looking through a polar scope, then polar alignment can be achieved, but user neck strain increases and alignment accuracy decreases
Solution Approach 1:
The patent uses a camera to capture an image of the polar scope's field of view and displays it on a screen, creating a visual copy that the user can view without physically looking through the scope. This eliminates neck strain while maintaining alignment accuracy by allowing the user to see the reticle and star positions clearly on the display.
Solution Approach 2:
The patent introduces a camera and display screen as intermediary devices between the user and the polar scope. The camera captures the optical field and transmits it electronically to the display, mediating the interaction so the user can align the mount without direct visual inspection through the scope.
2Measurement precision
If a user manually aligns stars with reticule images through a polar scope, then polar alignment can be achieved, but alignment accuracy decreases due to eye misalignment
Solution Approach 1:
The camera creates a digital copy of the polar scope's field of view, allowing precise visualization of star positions and reticle alignment without the limitations of direct optical viewing. The display shows the exact positions clearly, eliminating errors from eye misalignment.
Solution Approach 2:
The system provides visual feedback by displaying the captured image with the reticle and star positions on a screen. The user can see the alignment status clearly and make adjustments based on this feedback, with the option to capture multiple images and compare alignment progress.
3Measurement precision
If an electronic polar scope with computerized matching is used, then alignment accuracy improves, but device complexity increases
Solution Approach 1:
The system performs automated functions including capturing images, processing them to identify star positions, matching stars with a catalog database, and calculating the precise polar alignment. This self-service capability achieves high accuracy while reducing the user's burden, as the computer handles the complex calculations automatically.
Solution Approach 2:
The patent replaces manual mechanical alignment procedures with an electronic and computational system. Instead of physically adjusting components based on visual inspection, the system uses a camera, image processing, and computer algorithms to determine and guide alignment, substituting mechanical operations with electronic ones.
Data Source
AI summary
A technique for polar aligning the mount of a telescope or other astronomical instrument includes acquiring star images from an electronic polar scope and determining a location of a celestial pole relative to the star images based on computerized matching of the star images to information in a database. The mount has a right-ascension (RA) axis, and the technique directs an adjustment to the mount so as to align a location of the RA axis with the determined location of the celestial pole.