A Harmonic Detection Object Detection Algorithm and Device Based on Multidimensional Information Fusion
A technology of object detection and multi-dimensional information, applied in the field of harmonic detection, can solve problems such as unfavorable spectrum analysis, affecting the practical application of harmonic detection technology, and greatly affecting the detection accuracy
Active Publication Date: 2020-04-21
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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Problems solved by technology
The harmonic detection method based on the instantaneous reactive power theory is simple in principle and fast in dynamic response, but its detection accuracy is greatly affected by the filter, and at the same time it only transforms in the time domain, which is not conducive to spectrum analysis; the method based on Fourier transform The harmonic detection method obtains the energy of the second harmonic and the third harmonic by performing Fourier transform on the received signal. The energy-based detection method is simple in principle and high in engineering feasibility, but this method can only simply judge whether the target exists or not. , the object resolution is low, which seriously affects the practical application of harmonic detection technology
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Embodiment 1
[0057] Step 1: spectrum information extraction;
[0058] This system divides the entire detection area into N sub-areas, and each area corresponds to a group of transceiver channels. The N transceiver channels are independent of each other and work in turn according to a certain scanning sequence. When the system is working, the metal junction or semiconductor junction is irradiated by electromagnetic waves of a specific frequency, thereby scattering the second harmonic signal and the third harmonic signal. The harmonic signal enters the receiving channel of the radio frequency terminal through the receiving antenna, and completes frequency division, After filtering and down-conversion processing, it is converted from radio frequency to intermediate frequency, and then converted into a digital signal through AD sampling. The digital signal enters the numerical control board, and realizes filtering, down-conversion and extraction processing in the numerical control board, so as...
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The invention relates to harmonic detection technology, and provides a harmonic detection object detection algorithm and device based on multi-dimensional information fusion for the problems existing in the prior art. Obtain multi-dimensional information, jointly judge from different dimensions, improve the object resolution of harmonic detection, reduce the probability of false alarms, improve anti-interference ability, and then improve the practical applicability of harmonic detection. The present invention first judges whether there is a target according to whether the total energy of each channel crossing the threshold point is 0. The number of harmonic threshold points, the total energy value of the third harmonic threshold point, the contribution of the second harmonic energy to the total harmonic energy, and the relationship between the second harmonic kurtosis coefficient and the third harmonic kurtosis coefficient are detected. Regular multi-metal junction objects (such as keys), regular objects with mainly metal junction characteristics (such as metal shell electronic equipment), and regular objects with semiconductor junction characteristics; otherwise, it will be judged as no detection target and output no detection target result .
Description
technical field [0001] The invention relates to harmonic detection technology, in particular to a harmonic detection object detection algorithm and device based on multi-dimensional information fusion. Background technique [0002] Studies have shown that artificial metal targets and semiconductor targets have nonlinear characteristics. When electromagnetic waves of a specific frequency are used to irradiate artificial metal targets and semiconductor targets, in addition to scattering incident waves, they will also radiate frequency components that are not included in the incident waves—harmonic waves. portion. For semiconductors, its V-I characteristics can be expressed in an exponential form, which can generate rich harmonic frequencies, and the conversion loss of the lowest frequency harmonic is the smallest, so its second harmonic power is the largest. For artificial metal targets, its V-I characteristic is an antisymmetric curve, so it can only produce odd harmonics, a...
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IPC IPC(8): G06K9/00
CPCG06F2218/08G06F2218/12
Inventor 夏碧君何俊岑肖开奇樊博宇向龙凤曾跃胜
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP