A time-reversal electromagnetic cancellation method for active stealth

Abstract

The invention provides an active electromagnetic cancellation method based on time-reversal electromagnetic wave focused transmission, which belongs to the field of electromagnetic stealth and electronic countermeasures. The method of the present invention first uses the Clean algorithm to extract the channel impulse response, and then flips on the corresponding time axis according to the discrete impulse response value, and then uses the flipped impulse response to modulate the pulse to obtain a time-reversed electromagnetic pulse return signal , and finally use the cancellation signal to generate the antenna to transmit the return signal, and focus the transmission through time reversal to focus the electromagnetic energy on the receiving antenna of the enemy radar to cancel the echo returned from the target to the receiving antenna of the enemy radar Signal. The method realizes the separation of the cancellation system and the target, can carry out one-to-many electronic support, and utilizes the characteristics of the equivalent channel impulse response on the time axis, and can simply and quickly construct the cancellation signal without complicated calculations.

Description

technical field [0001] The invention belongs to the field of electromagnetic stealth and electronic countermeasures, and in particular relates to an electromagnetic cancellation method based on time-reversal electromagnetic wave transmission. Background technique [0002] Electromagnetic stealth is an important research topic in the development of countries in the world today, and its core is to realize one's own goals not to be detected by enemy radars. At present, electromagnetic stealth mainly uses physical mechanisms such as electromagnetic energy absorption, angular reflection, scattering, and transmission to reduce the detectable information of the target. The main technologies include: wave-absorbing material stealth and shape stealth, and the latest research on plasma stealth. [0003] The absorbing material is a kind of material that can absorb the electromagnetic wave energy projected on its surface, and convert the electromagnetic wave energy into heat energy or d...

AI Technical Summary

Problems solved by technology

[0006] However, the direction of the electromagnetic wave emitted by the traditional electromagnetic cancellation technology must be consistent with the direction of the reflected wave. The computer must also know the reflection characteristics of the target, and at the same time, the emission time must match the incident wave, so the whole system is very complicated.

In particular, active targets such as antennas and radars need to emit electromagnetic waves to the outside. If traditional electromagnetic wave transmission methods are used for cancellation, it will affect their own detection signals.

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