Research On Radio Frequency Interference Suppression Technology With Integration Of Electromagnetic Countermeasure And Sensing

The core problem of the electronic countermeasure and sensing integrated system is to suppress the interference of one's own high-power interference signal on the electromagnetic sensing task.Through the three-layer interference suppression method in the air,radio and digital domains,self-interference is suppressed to the vicinity of the receiver's noise floor.The receiver can detect environmental signals normally,and realize real-time and accurate spectrum sensing of the complex electromagnetic environment on the battlefield.Combat and perceive the purpose of integrated health work.Aiming at the interference suppression requirements in the integrated electromagnetic countermeasure and sensing system,this paper focuses on the radio frequency domain self-interference suppression method,and designs a digitally assisted radio frequency domain self-interference suppression scheme,and implements the scheme on the ARM+FPGA joint architecture And experimental verification.The main work of this paper is as follows:First,summarize the current status of research on the integration of electromagnetic countermeasures and perception.Aiming at the application background of the integration of electromagnetic countermeasure and perception,the necessity of interference suppression in the integrated electromagnetic countermeasure and perception system is clarified,and the principle of typical radio frequency domain self-interference suppression is given,which provides a reference for the design of radio frequency domain interference suppression schemes in this paper.Second,analyze the demand for radio frequency interference suppression in the integrated electromagnetic countermeasure and sensing system.The application scenarios and functional models of the integrated system were established,and the three core indicators of radio frequency interference suppression,frequency coverage,suppression capability,and processing speed,were quantified.Third,design a radio frequency interference suppression scheme in an integrated electromagnetic countermeasure and sensing system.Based on the overall architecture of the electromagnetic countermeasure and sensing integrated system and the self-interference channel model,the principle of the digital-assisted radio frequency domain interference suppression algorithm is explained in detail.According to the algorithm,the radio frequency domain interference suppression scheme is designed,and the RF domain under ideal conditions is completed in Matlab The interference suppression performance is simulated,and the influence of non-ideal factors such as delay offset and the number of taps on the interference suppression performance is analyzed.Fourth,complete the engineering realization of radio frequency interference suppression in the integrated electromagnetic countermeasure and sensing system.According to the overall framework,it is divided into microprocessor architecture and logic layer architecture,and then the two architectures are divided into sub-modules,the interface definition and constraints of each sub-module are carried out,and the function of each module is explained.Unite all modules for simulation,implementation,and joint testing,optimize the design of the scheme,and finally evaluate the resource consumption.Fifth,complete the experimental verification of radio frequency interference suppression for the integrated electromagnetic countermeasure and sensing system.In response to the index requirements,by controlling the communication signal transmission power and the interference signal power,the narrowband,broadband,total interference and pulse interference scenarios were tested respectively,the test results were analyzed and the index requirements were compared,and the index requirements for frequency coverage,suppression capability,and processing speed were achieved..The thesis provides an interference suppression scheme in the radio frequency domain in the integrated electromagnetic countermeasure and sensing system,and the feasibility is verified through experiments.The research results of this paper can provide theoretical support for the design of integrated data links on airborne,shipborne,and vehicle-mounted platforms carrying dense electromagnetic wave transceiver equipment.