Electromagnetic signal screening method and device

Abstract

The invention provides an electromagnetic signal screening method and device, and the method comprises the steps: firstly obtaining the amplitude data and phase data of a to-be-detected electromagnetic signal, extracting a first feature from the amplitude data, extracting a second feature from the phase data, and generating a time-frequency heat map according to the first feature and the second feature; thereafter, according to a specified threshold, roughly dividing the time-frequency heat map into a first pre-selected region corresponding to a strong target and a second pre-selected region corresponding to a weak target. Further, the proportion of the first preselected area and the second preselected area in the to-be-detected electromagnetic signal is calculated to determine a first area and a second area, iterative calculation is carried out according to the first area, the amplitude data and the phase data, a first target electromagnetic signal is screened out in the first area, and iterative calculation is performed according to the second pre-selected region, the amplitude data and the phase data, and a second target electromagnetic signal is screened out in the second region.

Description

technical field [0001] The present application relates to the technical field of communications, and in particular to a method and device for screening electromagnetic signals. Background technique [0002] The signal receiving device passively detects and processes the electromagnetic signals emitted by the signal transmitting devices (such as drones) to implement passive detection, identification and positioning of these signal transmitting devices. Usually, the signal receiving device will know the model of the signal transmitting device in advance, so that the signal receiving device can directly determine its electromagnetic signal from the received numerous electromagnetic signals according to the model of a certain signal transmitting device (such as a certain type of unmanned aerial vehicle). The transmitted electromagnetic signal, and then implement passive detection, identification and positioning processing on the signal transmitting device according to the electr...

AI Technical Summary

Problems solved by technology

[0003] However, in practical application scenarios, the signal receiving device usually cannot know the model of each signal transmitting device in advance, and it cannot directly screen out the electromagnetic signals corresponding to each signal transmitting device. Therefore, in order to implement passive For processing such as detection, identification and positioning, it is necessary to first screen out the electromagnetic signals emitted by the signal transmitting device

However, because the characteristics of electromagnetic signals are unknown and changeable, and they are prone to problems such as complex environmental interference and time-frequency aliasing of other signals, it is difficult to accurately screen out electromagnetic signals.

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