Digital sextant

Abstract

The invention relates to a digital sextant which comprises a mechanical sextant. The mechanical sextant comprises a base which is provided with a fixed mirror, a telescope, a movable arm and an arc dividing disc. One end of the movable arm is provided with a movable mirror and is connected to a base included angle opposite to the dividing disc through a rotating shaft I. The digital sextant further comprises a capacitive gate ruler parallel to the base. One end of a ruler body of the capacitive gate ruler is connected to the movable arm through a rotating shaft II. A vernier of the capacitive gate ruler is connected to the base through a rotating shaft III. The rotating shaft III, the fixed mirror and the rotating shaft I are placed on the same straight line. The distance between the rotating shaft II and the rotating shaft I and the distance between the rotating shaft III and the rotating shaft I are equal. The vernier of the capacitive gate ruler is connected with a microprocessor I in a signal mode. The microprocessor I is connected with a display screen I. The digital sextant has the advantage that digitization of the mechanical sextant is achieved. Angle is measured, and meanwhile the measured starting point distance is automatically computed.

Description

technical field [0001] The invention relates to a digital sextant. Background technique [0002] At present, in the water and sand test using a survey ship, the commonly used methods for measuring the starting point distance are as follows: 1. Section marking method, constructing a marking cable (cableway), and determining the starting point distance of the vertical line according to the sign board; 2. GPS positioning system Measure the starting point distance, establish a GPS network, and use GPS to measure the starting point distance; 3. Use a mechanical sextant to meet, read the intersection angle, and then convert it into the required starting distance. [0003] Most hydrological stations in the lower Yellow River hydrological test use a mechanical sextant to measure the starting point distance of the vertical line. It is the main test instrument for measuring the starting point distance of the current ship survey. It has the characteristics of fast measurement, simple u...

AI Technical Summary

Problems solved by technology

However, the mechanical sextant also has some shortcomings in the measurement of the starting point distance: 1. It can only read the intersection angle (divider type), and the distance between each degree is about 1mm. It is difficult to read, and sometimes there may be reading errors, and The degrees and fractions need to be read at different positions, and then the angles are synthesized. The reading is very troublesome; 2. The measured data is the intersection angle, which is not the starting point distance data we need. It needs to be calculated manually (or look up the table) to get the vertical angle. 3. The information observed by the sextant is not digital information, which cannot be recognized by the computer, and the data communication between the sextant and the computer cannot be realized, which hinders the computer's automatic information collection and processing development of

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