Multi-dimensional information fusion-based harmonic detection object detection algorithm and apparatus

Abstract

The present invention relates to technologies of harmonic detection, and provides a multi-dimensional information fusion-based harmonic detection object detection algorithm and apparatus. The present invention aims to solve the problems in the prior art. Multi-dimensional information is acquired, and joint determining is based on different dimensions, so that object resolution in harmonic detection is improved, the probability of false alarm is lowered, the anti-interference capability is improved, and harmonic detection is more practical and feasible. According to the method, whether a target exists is determined according to whether threshold total energy of each channel is zero; if yes, the target exists, regular objects (like metal shell electronic equipment) dominated by irregular multi-metal knot objects (including keys) and metal knot features, and regular objects dominated by semi-conductor knot features are detected according to a quantity of secondary harmonic thresholds, a total energy value of secondary harmonic thresholds, a quantity of third harmonic thresholds, a total energy value of third harmonic thresholds, contribution of the secondary harmonic energy to total harmonic energy, and a relationship between a secondary harmonic peak coefficient and a third harmonic peak coefficient; and if not, it is determined that no detection target exists, and a result indicating that no detection target exists is output.

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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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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