Radio frequency cancellation method based on optical true time delay network

Abstract

The invention discloses a radio frequency cancellation method based on an optical true time delay network, and the method specifically comprises the steps: dividing a transmitted radio frequency signal into two paths: modulating a reference radio frequency cancellation signal to an unmodulated signal with multiple frequency components at a reference signal end, dividing the reference radio frequency cancellation signal into multiple paths of modulated optical signals through a wavelength division multiplexer, sending the signals to a multi-channel adjustable true delay optical network for delay amount and attenuation amount adjustment, and sending the combined output signals to a photoelectric detector to recover reference radio frequency cancellation signals; at a signal receiving end, transmitting the received radio frequency signal through an electric or optical link and outputting the received radio frequency signal; and finally, combining and subtracting the reference radio frequency cancellation signal recovered by the reference signal end from the received radio frequency signal, and outputting two paths of combined signals to obtain the received radio frequency signal afterthe reference radio frequency cancellation signal is eliminated. According to the invention, a time delay technology with a larger adjustment range and tuning precision can be provided, interferencesignals with agile characteristics can be responded and processed more quickly, and the method is of great significance for solving the problem of radio frequency cancellation of a receiving end.

Description

technical field [0001] The invention belongs to the fields of microwave photonics, radio frequency communication and radar detection, and in particular relates to a radio frequency cancellation method based on an optical true delay network. Background technique [0002] Under complex electromagnetic environment conditions, the interference signals faced by the front end of the RF receiver generally have the characteristics of agility, wide spectrum, and strong power. The existence of interference signals will cause the receiver to fail to measure and process the signals normally. In general, the interference signal can be eliminated after digital sampling. However, when the interference signal power is high, it will directly saturate the front-end amplifier of the receiver and cause signal distortion; in addition, as the frequency bands used in electronic reconnaissance and full-duplex wireless communication are getting higher and higher, the response of digital signal proc...

AI Technical Summary

Problems solved by technology

However, when the interference signal power is high, it will directly saturate the front-end amplifier of the receiver and cause signal distortion; in addition, as the frequency bands used in electronic reconnaissance and full-duplex wireless communication are getting higher and higher, the response of digital signal processing technology The rate also limits the real-time performance of processing broadband interference signals

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