Radio frequency digital interference canceller

Abstract

The invention relates to a radio frequency digital interference canceller, which mainly comprises a reference radio frequency sampling circuit, an error radio frequency sampling circuit, a radio frequency cancelling output circuit, a clock circuit, a time delay line, a noise source and a digital signal processing unit. The radio frequency digital interference canceller provided by the invention adopts a radio frequency digitalization technology system for the first time, provides a specific circuit construction scheme and a signal processing method, adopts a no-delay LMS (least-mean-square) adaptive filtering technology, and put forward an RLS (Recursive least-square) based closed loop nonlinear group delay correction method. The radio frequency digital interference cancels is characterized in that extraction of error signals and reference signals is carried out in a digital domain; adaptive filtering, weighting and waveform generation are carried out in the digital domain; and interference cancelling is still carried out in an analog domain. The radio frequency digital interference canceller has the technical advantages of small size, light weight, high waveform adaptability, ability of cancelling waveforms such as fixed frequency, frequency hopping and pulses, good broadband performance, ability of cancelling multi-source interference and high cancelling suppression ratio.

Description

technical field [0001] The invention relates to the field of information technology, in particular to a radio frequency digital interference canceller. Background technique [0002] Interference cancellers have high military application value. It can be used to solve the electromagnetic compatibility problem of multi-task electronic systems on the same platform. In the past, when the transmitter was working, it would cause the receiver in the same frequency band to saturate and block and fail to work, which greatly reduced the combat effectiveness of the mission system. The interference canceller can effectively solve this co-site interference problem, so that the receiving system and the transmitting system can work simultaneously in the same frequency band, which will greatly improve the combat effectiveness of the system. Interference cancellers can also be used for self-interference problems within / between communication devices. In the past, communication was carried ...

AI Technical Summary

Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a radio frequency digital interference canceller, which is used to solve the problems of poor waveform adaptability, insufficient interference cancellation ability, large volume and heavy weight of traditional analog system interference cancellation

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