Device for calibrating aircraft magnetic compasses

Abstract

The invention provides a device for calibrating aircraft magnetic compasses, which consists of a sensor component and a manual operator component, wherein the sensor component mainly acquires geomagnetic / gravitational acceleration signals; the manual operator component mainly resolves, displays and stores magnetic azimuth; and the sensor component and the manual operator component exchange data through a wireless data-transmitting module. The device has the advantages of providing a more precise magnetic north benchmark for calibrating the aircraft magnetic compasses in a digitized form, solving mechanical friction, processing precision, value-reading errors, pointer shake and other technical problems of the conventional calibration device, simplifying the process of calibrating the aircraft magnetic compasses, reducing manpower and material investment for calibration and improving the efficiency and precision of calibrating aircraft magnetic heading instruments, along with small volume, light weight and low power consumption.

Description

technical field [0001] The invention relates to the field of measuring equipment, in particular to equipment and facilities for calibrating the heading of an aircraft magnetic compass. Background technique [0002] The aircraft magnetic compass is an instrument that uses the horizontal component of the geomagnetic field as a directional reference to measure the aircraft's magnetic heading. Together with the horizon indicator and the altimeter, it is called the three most important instrument systems on the aircraft. Generally, the emergency magnetic compass of an aircraft requires an accuracy of ±4°, and the gyro magnetic compass requires an accuracy of 1-1.5°. Because the metal parts on the aircraft will cause magnetic interference to the magnetic compass, in order to ensure the required accuracy of the aircraft magnetic compass, the heading must be calibrated regularly after the aircraft magnetic compass is installed. Since the aircraft magnetic compass must eliminate the ...

AI Technical Summary

Problems solved by technology

[0004] 1) The mechanical calibrator is actually a compass, using the most primitive way to find the magnetic north, there are a series of problems that need to be solved by machining technology such as mechanical friction, machining accuracy, and counterweight

[0005] 2) The mechanical calibrator uses the dial and the pointer to indicate the azimuth value, and the reading error caused by human visual difference is only about 0.5°, and this reading method is related to the experience of the tester, and there is artificiality in the test. Subjective factors, increasing the uncertainty of measurement accuracy

[0006] 3) The pointer of the mechanical calibrator is a gemstone bearing bracket structure, which must be installed within the horizontal range, which puts forward higher requirements for the installation of the test equipment, and there is an insurmountable problem of pointer shaking

[0007] 4) When testing a large aircraft, it is required to install the calibrator in the place with the least magnetic interference, usually near the vertical tail of the aircraft back, which requires the tester to rotate with the aircraft on the smooth back several meters high and observe at the same time The instructions of the mechanical calibrator increase the unsafe factors of testers and the cost of testing

[0008] 5) When the compass is calibrated by the directional instrument method, the alignment of the directional instrument directly affects the measurement accuracy. This work is performed by the sight on the directional instrument, which is similar to the rifle sight. The alignment accuracy is not high, and there is a certain degree of human subjectivity. Uncertainty in measurement accuracy due to factors

[0009] 6) If a digital compass is installed and used on the aircraft, the automatic error calibration cannot be achieved by using a mechanical calibrator, and it can only be done by manually checking the error

[0010] Because the above-mentioned aircraft magnetic compass calibration equipment has difficult technical problems such as measurement accuracy and verification error, it is difficult to meet the current requirements for the use of aircraft magnetic compass calibration equipment, which seriously affects the safe flight of general aircraft, especially in the country. The compass calibration accuracy and calibration speed of various aircraft directly affect flight safety

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