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A Measurement and Calibration Method for Accurately Measuring the Characteristic Response of Unexploded Bombs

A feature-response, precise measurement technology, applied in measurement devices, geophysical measurements, radio wave measurement systems, etc., can solve the problems of feature-response measurement error, target feature response distortion, and reduce target recognition accuracy, and improve accuracy. sexual effect

Inactive Publication Date: 2019-02-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: firstly, the actual target body has a certain volume, and the primary fields received by each position are not the same, which will lead to characteristic response measurement errors; secondly, the ground and other background responses are not deducted during the measurement, thus resulting in The response is too large; finally, due to the influence of signal saturation and noise, the measured characteristic response of the target body is seriously distorted. Using these distorted characteristic responses to build a database will reduce the accuracy of target recognition

Method used

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  • A Measurement and Calibration Method for Accurately Measuring the Characteristic Response of Unexploded Bombs
  • A Measurement and Calibration Method for Accurately Measuring the Characteristic Response of Unexploded Bombs
  • A Measurement and Calibration Method for Accurately Measuring the Characteristic Response of Unexploded Bombs

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Experimental program
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Embodiment 1

[0030] Embodiment 1: Further analysis of the measurement method of the present invention (the target object is the unexploded bomb hereinafter).

[0031] 1. Definition of Unexploded Bomb Characteristic Response

[0032] Such as figure 1 As shown, the unexploded bomb in the pulsed magnetic field H P The eddy current is induced under the excitation of the (primary field), and the magnetic field (secondary field) generated by the eddy current in space can be equivalent to a group of dipoles with coincident centers and orthogonal directions m=(m x , m y , m z ) the magnetic field generated in space, the secondary field H at point P in space can be calculated as:

[0033]

[0034] (1) In the formula, r is the position vector of point P, r is the modulus value of r, e r is a unit vector parallel to r.

[0035] When the main axis of the unexploded bomb is parallel to the z-axis, the dipole m is calculated as:

[0036]

[0037] β of axisymmetric target body xx = β yy , ...

Embodiment 2

[0080] Embodiment 2 measurement length is 27cm, and diameter is the characteristic response of 82mm mortar shell

[0081] 1. Establish a measuring device for the characteristic response of unexploded bombs.

[0082] established as image 3 A pair of characteristic response measurement devices shown: a long straight solenoid with a length of 120cm and a diameter of 22cm, with a total of 30 turns, uniformly distributed, used as a measurement device for the characteristic response of the longitudinal axis. The rectangular coil group consists of two rectangular coils connected in series in the same direction. Each rectangular coil is 100cm long, 60cm wide, and has 12 turns. The two rectangular coils are placed parallel and coaxially with a distance of 36cm to form a horizontal axis characteristic response measurement device.

[0083] 2. Measurement of the characteristic response of the longitudinal axis of unexploded bombs.

[0084] Such as Figure 4 As shown, place the receivi...

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Abstract

The invention provides a measurement and calibration method for accurately measuring dud characteristic response, belongs to the technical field of target detection and recognition, and is mainly used for measuring the characteristic response of various types of duds in the laboratory so that a dud characteristic response database is established to act as the basis for target recognition in the actual detection process. According to the method, the secondary field generated by the dud along longitudinal axis and transverse axis directions is respectively measured under the excitation of a uniform pulse magnetic field; the measurement system is calibrated so as to obtain the characteristic response calibration coefficient; and finally the target characteristic response lp(t) and lv(t) are obtained. The dud characteristic response measurement device is designed for aiming at the problem of low measurement accuracy of the conventional method, and background field deduction, measure distance adjustment and the calibration method are put forward to enhance the measurement accuracy of the characteristic response so as to provide an effective means for accurately acquiring the dud characteristic response.

Description

technical field [0001] The invention belongs to the technical field of target detection and identification, and specifically relates to the theory and method of using a specially designed device to accurately measure the characteristic responses of various unexploded bombs in a laboratory. These characteristic responses can be used to establish a characteristic response database. As the basis for the system to identify various targets during actual detection. Background technique [0002] Unexploded ordnance mainly refers to landmines, artillery shells, aerial bombs, etc. that have not yet been detonated after war or other military activities. These munitions are scattered on the surface or extremely shallow underground, seriously threatening people's lives and affecting local social and economic development. The transient electromagnetic method is widely used in the detection of unexploded bombs due to its high detection efficiency and strong ability to identify targets. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/11
CPCG01V3/10
Inventor 陈曙东张爽王昊丰郭欣
Owner JILIN UNIV