Digital-analog hybrid adaptive interference cancellation device

Abstract

The invention discloses a digital-analog hybrid adaptive interference cancellation device comprising an analog vector modulator and a digital correlation controller. The analog vector modulator includes a transmitting directional coupler, a quadrature power divider, an I-way directional coupler, an I-way electrically switched attenuator, a Q-way directional coupler, a Q-way electrically switched attenuator, a first power combiner, a second power combiner, and an error directional coupler. The digital correlation controller comprises three same ADC sampling channels, two identical DAC output channels, a digital processing core FPGA, and a data processing core FPGA running a digital control algorithm. The analog vector modulator is realized by an analog device, which does not involve the amplification of power signals and has characteristics of low noise and low distortion. The digital correlation controller makes full use of the programmable and insensitive characteristics of digital devices, and has the advantages of simple debugging and upgrading, high environmental adaptability, high device parameter consistency, high loop gain adjustable upper limit, and easy multi-channel integration.

Description

technical field [0001] The invention relates to the technical field of electromagnetic interference, in particular to a digital-analog hybrid adaptive interference cancellation device. Background technique [0002] Modern military combat platforms such as warships, tanks, aircraft, and satellites integrate various radio frequency systems such as communications, radar, electronic warfare, and reconnaissance. Various high-power transmitting equipment and high-sensitivity receiving equipment need to work on the same platform. There is a complex coupling relationship between antennas, which leads to increasingly prominent electromagnetic compatibility problems in various systems within the platform. The high-power transmission signal, through the coupling effect of the transmitting antenna and the receiving antenna, can form an interference voltage signal of several millivolts to tens of volts at the receiver port, which seriously interferes, blocks or even burns the receiver, r...

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Problems solved by technology

[0004] Chinese invention patents "Application No. CN201710851619 for Adaptive Control Circuit and Control Method for Adaptive Interference Cancellation Device" and "Application No. CN201710846705 for Co-located Interference Cancellation Device for Multiple Transceiver Integrated Radio Stations" all involve self-adaptive control based on orthogonal vector synthesis. Adapt to interference cancellation technology, however, the vector modulators and related controllers in their circuits or devices are all implemented by analog devices. The problems faced are: 1. Once the functions of analog devices are confirmed, the hardware must be replaced when upgrading, resulting in difficulty in upgrading; 2. Correlation The controller runs an adaptive control algorithm, including active integrated circuits such as analog multipliers and high-gain amplifiers. Its output zero point is easily affected by ambient temperature and humidity; The output of the amplifier is saturated, which leads to the failure of the cancellation function. 3. The consistency of parameters within the same batch of analog devices and between different batches is poor, resulting in differences in the performance parameters of different interference cancellation devices. 4. The performance of the cancellation device is controlled by the loop gain. , limited by the limited output voltage range of analog devices and device stability requirements, the upper limit of loop gain improvement is limited. Difficult to integrate

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