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Laser aiming reference object-free aircraft magnetic heading calibration method

A technology of laser aiming and calibration method, applied in measuring devices, instruments, etc., can solve the problems of high safety risk, difficult operation, fuel consumption, etc., and achieve the effect of reducing safety risk, easy operation, and prolonging service life

Pending Publication Date: 2022-01-14
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The cost is high, and a dedicated magnetic compass calibration site is required, such as a compass field and a thin-height target reference object, which is 1 kilometer away from the compass field. In the absence of a magnetic compass calibration site, such as after the aircraft is transferred or the field is tested When magnetic heading calibration is required, it cannot be performed
[0005] 2. It is greatly affected by the weather. In the case of rain, fog and haze, and low visibility, the existing magnetic heading calibration method cannot be carried out
[0006] 3. The safety risk is high. When the magnetic heading is calibrated in all directions, the operator is required to lie on the back of the aircraft and observe the thin and tall target through the azimuth when the aircraft is in a circular motion. The operator on the back of the aircraft has a greater safety risk.
However, this patent document embeds the compass automatic calibration system in the mainframe of the strapdown attitude computer. When the aircraft engine is working, the electronic compass field is first modeled for one circle of circular motion, and then calibrated for the second circle of circular motion. , the acquisition and calibration are carried out at fixed (0°, 45°, 90°, 135°, 180°, 215°, 270°, 315°, 360°) 8-point azimuths, and its defects are: The dynamic taxiing work needs to be completed by the pilot when the engine is working, and the operation is difficult; the engine work consumes fuel, which not only increases the cost but also wastes the service life of the engine, and there is also a safety risk; because the method of establishing an electronic compass field is that the aircraft must be marked Good 0° is the starting point, turn left and return to the starting point after 360° circular motion, but when the end point is not at the starting point, the establishment of the electronic compass field is invalid and needs to be re-established, so this method is difficult to operate; the magnetic heading of the emergency magnetic compass cannot be calibrated

Method used

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  • Laser aiming reference object-free aircraft magnetic heading calibration method
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  • Laser aiming reference object-free aircraft magnetic heading calibration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] see figure 1 and figure 2 , a method for calibrating an aircraft magnetic heading with laser aiming without a reference object, comprising the following steps:

[0035] a. Install the target board on the longitudinal axis under the nose of the aircraft, and then tow the aircraft to the calibration site in an open area;

[0036] b. Place the laser azimuth on a tripod in the center of the calibration site, and read the laser heading through the compass scale of the laser azimuth;

[0037] c. Use the laser azimuth to emit lasers in the directions of 0°, 45°, 90°, 135°, 180°, 225°, 270° and 315° in sequence, and mark them on the calibration site;

[0038]d. Tow the aircraft around the center of the calibration site, and then turn it at 0-45°, 45-90°, 90-135°, 135-180°, 180-225°, 225-270°, 270-315° and 315- Stop the aircraft at any position within the eight intervals of 360°;

[0039] e. The laser is fired at the target board through the laser azimuth. When the laser be...

Embodiment 2

[0043] see Figure 1-Figure 3 , a method for calibrating an aircraft magnetic heading with laser aiming without a reference object, comprising the following steps:

[0044] a. Install the target board on the longitudinal axis under the nose of the aircraft, and then tow the aircraft to the calibration site in an open area;

[0045] b. Place the laser azimuth on a tripod in the center of the calibration site, and read the laser heading through the compass scale of the laser azimuth;

[0046] c. Use the laser azimuth to emit lasers in the directions of 0°, 45°, 90°, 135°, 180°, 225°, 270° and 315° in sequence, and mark them on the calibration site;

[0047] d. Tow the aircraft around the center of the calibration site, and then turn it at 0-45°, 45-90°, 90-135°, 135-180°, 180-225°, 225-270°, 270-315° and 315- Stop the aircraft at any position within the eight intervals of 360°;

[0048] e. The laser is fired at the target board through the laser azimuth. When the laser beam i...

Embodiment 3

[0052] see Figure 1-Figure 3 , a method for calibrating an aircraft magnetic heading with laser aiming without a reference object, comprising the following steps:

[0053] a. Install the target board on the longitudinal axis under the nose of the aircraft, and then tow the aircraft to the calibration site in an open area;

[0054] b. Place the laser azimuth on a tripod in the center of the calibration site, and read the laser heading through the compass scale of the laser azimuth;

[0055] c. Use the laser azimuth to emit lasers in the directions of 0°, 45°, 90°, 135°, 180°, 225°, 270° and 315° in sequence, and mark them on the calibration site;

[0056] d. Tow the aircraft around the center of the calibration site, and then turn it at 0-45°, 45-90°, 90-135°, 135-180°, 180-225°, 225-270°, 270-315° and 315- Stop the aircraft at any position within the eight intervals of 360°;

[0057] e. The laser is fired at the target board through the laser azimuth. When the laser beam i...

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Abstract

The invention discloses a laser aiming reference object-free aircraft magnetic heading calibration method, which belongs to the technical field of aviation airborne strapdown heading attitude navigation, and is characterized by comprising the following steps of: a, mounting a target plate on a longitudinal axis below an aircraft nose; b, reading the course of emitted laser; c, emitting laser; d, dragging the airplane to rotate around the center of a calibration site; e, emitting laser to the target plate through a laser azimuth instrument, and calculating to obtain a real magnetic heading angle of the airplane; and f, carrying out magnetic heading calibration on an emergency magnetic compass and a strapdown backup navigation system. The method does not need to coordinate a pilot and start an aircraft engine, an operator does not need to get on and off an aircraft back, operation is easy, safety risks are reduced, the method is not influenced by visibility, and accurate calibration can be conducted even under the weather condition of low visibility.

Description

technical field [0001] The invention relates to the technical field of aviation airborne strap-down attitude navigation, in particular to an aircraft magnetic heading calibration method for laser aiming without a reference object. Background technique [0002] Due to the influence of the surrounding environment of the aircraft and the electromagnetic field of the airborne equipment on the magnetic induction element or magnetic sensor sensitive to the geomagnetic component after the aircraft is powered on, it is necessary to calibrate the magnetic heading indicated by the emergency magnetic compass and the magnetic heading output by the strapdown combined backup navigation system. [0003] At present, the most commonly used magnetic heading calibration method is the magnetic compass calibration method, that is, in the process of towing or pushing the aircraft to make a circular motion, through the azimuth installed on the longitudinal axis of the back of the aircraft, aim at t...

Claims

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/00Y02A90/30
Inventor 金优辉邓攀贾鸿冯虎军
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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