Adaptive control circuit and control method for adaptive interference cancellation device

Abstract

The invention discloses an adaptive control circuit used for an adaptive interference cancellation device. The adaptive control circuit comprises a first frequency band selection filter, a second frequency band selection filter, a delayer, a reference sampling AGC module, an error sampling AGC module, a first fixed gain adjusting module, a second fixed gain adjusting module, an error sampling power divider, a reference sampling orthogonal power divider, an I-path multiplier, a Q-path multiplier, a reference sampling power detection module, a logic control module, an I-path low-pass filter, a Q-path low-pass filter, an I-path controllable integrator and a Q-path controllable integrator. The AGC technology is introduced so that the dynamic range of the amplitude of the reference sampling signal and the error sampling signal can be effectively compressed and the relatively stable interference suppression effect can be obtained; and the integral time constant under different interference transmitting power conditions is switched through the integral time constant switching control method so that high interference cancellation ratio and rapid convergence can be both realized under sharpdynamic change of interference sampling power.

Description

technical field [0001] The invention belongs to the technical field of circuit design and signal processing, and in particular relates to an adaptive control circuit and a control method for an adaptive interference cancellation device. Background technique [0002] Near-range radiation interference of transceiver antennas on common platforms such as aircraft and ships is ubiquitous and increasingly serious. Adaptive radiation interference cancellation technology is an effective technical approach to solve the problem of radiation interference in the near area of ​​the common platform transceiver device antenna. The adaptive interference canceling device utilizes the correlation between the interference signal and the reference signal to adaptively track and filter out the narrowband interference signal. The adaptive control circuit is used to extract the correlation between the interference signal and the reference signal, and its adaptive control method directly affects t...

AI Technical Summary

Problems solved by technology

However, limited by the stability conditions of the feedback control loop, the gain-bandwidth product of the feedback control loop is often lower than a certain upper limit condition

[0011] Chinese patent ultrashort wave electromagnetic interference cancellation device (application number 201010198092.0), a multi-channel interference cancellation device (application number 201518001239.6), co-site coupling interference cancellation device (application number 201518001240.9), adaptive broadband interference cancellation device (application number No. 201320001505.0), an adaptive interference cancellation device and its debugging method (Application No. 201110223502.7) The adaptive interference cancellation module or device is based on such figure 1 The orthogonal vector synthesis circuit shown, but none of its invention content is aimed at the problem that it is difficult to balance the fast convergence of interference and the high interference cancellation ratio when the interference power changes in a large dynamic range

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