A rocket sled image velocity measurement method

A technology of image speed measurement and rocket sled, which can be applied to devices using optical methods, etc., and can solve problems such as radar and visor failure.

Active Publication Date: 2019-03-12
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

[0012] The technical problem that the present invention solves is: find a kind of image speed measuring method of rocket skid, this method can measure the speed of skid body running accurately, solve the problem that radar, light-shielding board is affected by engine ignition and become invalid when multi-stage engine is separated, with Provides high-precision velocity information

Method used

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  • A rocket sled image velocity measurement method
  • A rocket sled image velocity measurement method
  • A rocket sled image velocity measurement method

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Embodiment

[0125] In a rocket sled test, set the shooting frequency f = 2000 frames per second, the length corresponding to a single pixel point c = 22 μm, and the proportional coefficient k = 853.65. figure 2 The positions of the rocket sled track and fasteners in the original photo are processed by image processing so that there is no background noise. The part marked with a purple rectangular box on the rocket sled track at the bottom of the photo is the position of the fasteners on the rocket sled track , the value in the white box indicates the pixel distance between two adjacent fasteners. ; image 3 The straight line model established for the fastener sequence at the point position of the original photo. The coordinate system is the right-handed coordinate system oxy (the center point coordinate system of the original photo) with the center of the photo as the origin and the ox axis horizontally to the right. The coordinate axis crosses the black in the middle of the photo. The ...

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Abstract

The invention provides an image-based speed measurement method for a rocket sled. A high-speed camera is used for shooting an operation process of a sled body continuously; and after completion of a test, pitching and orientation information correction of the high-speed camera relative to a track, sled body feature point extraction, and operation speed calculation are carried out, thereby completing measurement of the operation speed of the sled body. The method has advantages of high speed measurement precision, simple and clear idea, and easy programming implementation. With the method, the speed measurement precision of the key position in the rocket sled test can be improved.

Description

technical field [0001] The invention relates to a rocket sled image speed measurement method, in particular to a method for measuring the running speed of a sled by continuous shooting with a high-speed camera, which belongs to the field of rocket sled testing. Background technique [0002] The rocket sled test has the ability to produce comprehensive conditions such as large overload, high speed, strong vibration and shock, and can simulate the real flight environment of the missile most realistically. Through the test, various performance indicators and accuracy of the inertial measurement system can be assessed under comprehensive environmental conditions, and the correctness of the error model of the inertial measurement system can be verified under high dynamic conditions, especially in the case of large overload, the amplification effect of high-order terms can be Determining the influence of high-order error terms of inertial measurement system on navigation performan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/38
CPCG01P3/38
Inventor 魏宗康彭智宏江麒吕滕
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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