Research On Signal Reconnaissance, Classification And Realization Of Spatial Multiple Radiation Sources

In the process of modern electronic warfare,the use of interference signals to mislead the collection equipment has become the mainstream anti-war means,so signal reconnaissance is particularly important.It is able to extract the characteristics of multiple interference signal sources in space and accurately identify their orientation and characteristics,which plays a decisive role in accurately acquiring intelligence and accurately attacking enemy targets.This dissertation focuses on the location identification of multiple interfering radiation sources(continuous wave interference,linear frequency modulation interference,pulse interference,narrowband white Gaussian noise interference and broadband white Gaussian noise interference)in space,and can extract characteristics of their time,frequency,space,energy and the the other aspects,finally based on NI LabVIEW development software and CompactPCI hardware platform to complete the function realization and display of the entire system.The system is divided into three major categories: signal collection,signal processing,and parameter display.The signal acquisition part adopts NI's usrp 2955 receiving antenna,embedded Kintex7 fpga chip,and 14-bit configurable adc chip.Finally,the signal is converted from real signal to complex signal and mixed frequency by CORDIC algorithm;The signal processing part adopts NI's CopmactPCI hardware platform.The complex digital signal is first transmitted to the Kintex7 fpga by using the PCIe bus,and then the channelization algorithm based on polyphase filter is used to separate the channel in frequency domain for the transmitted signal and makes the processing channel narrow.channel detection is performed for each channel next,and finally the feature parameters of each channel are extracted to provide a basis for the DTSVM-based interference recognition mode;In terms of parameter display,NI equipment host is used to transmit the processed signal parameters to the host computer through the 80 M bandwidth transmission backplane,and the graphical programming function of LabVIEW is used to complete the 3D host computer interface to achieve display effect of the signal parameters.