Research And Implementation Of Broadband Reconnaissance And Signal Key Parameter Extraction Technology

With the continuous deepening of research in the field of electronic reconnaissance,as a key part of the electronic reconnaissance field,wide-band reconnaissance receivers have played a key role in the application of electronic warfare and have an important role in determining the trend of war.Facing the complex electronic warfare electromagnetic environment,researching digital reconnaissance receivers with wider reconnaissance frequency bands,greater reconnaissance dynamic range,higher accuracy,and more real-time processing capabilities of multiple signals has always been an important topic in the field of electronic reconnaissance.Electronic reconnaissance is used as the starting point of this article,studies the wideband reconnaissance receiver and signal key parameter extraction technology,and then implements the entire broadband detection system on the FPGA and FMC hardware platform.The specific work is as follows:Firstly,the digital channelization technology is introduced,and various digital channelization structures are derived.The frequency response masking technology(FRM)is applied to the design of the narrow transition band filter and the channelization structure in order to solve the common leakage alarm and mixing.At the same time,another solution is proposed in the actual design of the system,that is,the method of increasing the auxiliary passband of the filter.Both solutions have been proven to be effective by MATLAB simulation.Secondly,the signal detection,amplitude measurement,pulse width,arrival time measurement,frequency measurement,and modulation method identification in signal parameter extraction were studied in detail.Among them,signal detection studies the FFT method in the frequency domain and the energy detection method in the time domain;for the measurement of pulse width and arrival time,the time-domain summation method and the time-domain autocorrelation method are mainly studied,and an improved self-relation related detection algorithms;two methods of phase difference frequency measurement and FFT frequency measurement are introduced for frequency measurement;for modulation method identification,modulation characteristics of common reconnaissance signals are introduced,and the identification algorithms of phase modulation and frequency modulation signals are studied in detail.Based onthese studies,simulation analysis was conducted to fully compare the performance and difficulty of various methods,which laid the foundation for the FPGA hardware implementation behind.Finally,according to the hardware implementation requirements,a hardware platform combining FMC and FPGA was constructed,and various functional modules for wideband reconnaissance and signal key parameter extraction were completed.The system performance test was completed using the hardware platform and test instruments,the system can carry out reconnaissance on the wide frequency band of100MHz~400MHz,and can extract the key parameters of the detected signal.The accuracy of the parameter measurement can reach more than 99%,which meets the performance requirements of the broadband detection system.