Encoding and decoding method for wraparound coding mark points of external store wind tunnel model

Abstract

The invention discloses a coding and decoding method for surrounding coded marking points of a wind tunnel model of an external store, which comprises the following steps: creating characteristic coded marking points; creating surrounding coded marking points based on template points; extracting circular marking points; identifying codes mark point. The advantage of the present invention is that it not only solves the problem of identification and matching of marking points when the wind tunnel model of the external objects moves in the direction of six degrees of freedom, but also eliminates the need for external object wind tunnel The model opening and wiring will not destroy the aerodynamic shape of the wind tunnel model of the external storage, and will not change its structural strength and rigidity, which reduces the design difficulty and cost of the wind tunnel model of the external storage; More feature coding marker points can be distributed on the hole model, and the recognition accuracy rate of decoding is improved.

Description

technical field [0001] The invention relates to the technical field of wind tunnel tests for the separation of external objects, in particular to an encoding and decoding method for encircling encoding and marking points of an external object wind tunnel model. Background technique [0002] After the external storage objects (bombs, auxiliary fuel tanks, missiles, etc.) are dropped from the carrier aircraft, they are in the interference flow field of the carrier aircraft at the initial stage of leaving the carrier aircraft. The characteristics of the interference flow field are related to the shape, flight speed, flight altitude, The attitude of the carrier aircraft, the shape of the external store and its installation position and attitude are related to many factors, and it is difficult to use theoretical methods to predict the flight trajectory of the external store in the disturbed flow field; especially under the condition of high Mach number, due to the influence of com...

AI Technical Summary

Problems solved by technology

[0005] The color coding method embeds miniature color light-emitting devices on the surface of the wind tunnel model of the external store, codes and arranges the light-emitting devices according to the color, uses two color cameras to collect moving images of the marking points, and reconstructs the marks according to the color arrangement and decoding rules of the marking points The three-dimensional coordinates of the point, and then obtain the position and attitude information; however, the embedded micro light-emitting device destroys the structural strength of the wind tunnel model of the external store, which may affect the aerodynamic shape, and additional wiring is required, which increases the design difficulty and manufacturing cost. For the test model of free release, the mass distribution must be kept similar, and the embedded micro light-emitting device greatly improves the design and manufacturing difficulty of the free release test model; it destroys the structural strength of the wind tunnel model of the external store, and increases the design difficulty and manufacturing cost.

[0006] Generally, the inner circle is used to locate the code point, and the outer ring is used to determine the identity information of the code point. However, the size of the ring code mark point is generally large, and it is mostly used for the measurement of large industrial parts. When sticking or drawing on the surface of the model, the quantity is not only limited, but also easily deformed, which makes identification and matching difficult

Large size, not suitable for external wind tunnel models, prone to deformation, resulting in inaccurate identification and difficult matching

[0007] Surround coding markers, whose decoding depends on the distance relationship between circular markers, too few markers distributed on the external wind tunnel model, the decoding accuracy rate is too low

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