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Image-based speed measurement method for rocket sled

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

Active Publication Date: 2017-05-31
BEIJING INST OF AEROSPACE CONTROL DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
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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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  • Image-based speed measurement method for rocket sled
  • Image-based speed measurement method for rocket sled

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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 position of the rocket sled rail and fasteners in the original photo, and the photo is processed to have no background noise through image processing. The part marked with a purple rectangular box on the rocket sled rail at the bottom of the photo is the position of the fastener on the rocket sled rail , the value in the white box represents 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 (original photo center point coordinate system) with the center of the photo as the origin and the ox axis horizontally to the right, and the coordinate axis is a black cross in the middle of the photo. The th...

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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 method for measuring the speed of a rocket sled image, in particular to a method for measuring the running speed of a sled body by using a high-speed camera for continuous shooting, and belongs to the field of rocket sled testing. Background technique [0002] The rocket sled test has the ability to generate 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, the performance indicators and accuracy of the inertial measurement system under comprehensive environmental conditions can be assessed, and the correctness of the error model of the inertial measurement system under high dynamic conditions can be verified. Determining the influence of higher-order error terms of inertial measurement system on navigation performance is the best way to verify the dynamic performance of inertial measurement...

Claims

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Application Information

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Patent Type & Authority Applications(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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