Research And Implementation Of Communication Signal Reconnaissance Receiver And FMCW Radar Signal Processing

Electronic warfare is a special form of warfare in modern wars,and it is also a vital means of warfare.All forms of confrontation and offensive are based on electronic reconnaissance in electronic warfare.This dissertation introduces the communication signal reconnaissance receiver which is a technical means used in the field of electronic detection and is aimed at the communication signals in the first part.With the increasing complexity of electromagnetic environment on the battlefi eld,there are more and more requirements for communication signal reconnaissance receiver.The receiver in this dissertation adopts the structure of the channelized digital receiver,which can better meet the requirements of simultaneous processing of mul tiple signals and whole probability capturing.At first,the dissertation analyzes the general digital receiver.Then,the dissertation analyzes the channelized digital receiver based on multiphase filter structure.Finally,through introducing the concept of fast Fourier transform(FFT),the efficient structure of channelized digital receiver is obtained.At the same time,aiming at the issue that the same signal can not be recognized in the adjacent cha nnel,the dissertation adopts the channel estimation method based on instantaneous frequency measurement.Based on the theoretical framework,this dissertation completes the hardware implementation process on the field programmable gate array(FPGA)platform.Due to the special requirements of the polyphase filter structure,this dissertation designs a parallel FFT processing unit and optimizes it in order to achieve the purpose of saving resources as much as possible.This dissertation simulates the theoretical design of channelized digital receiver and the design of FPGA algorithm,and simulation results verify the correctness of the design.The detection system of communication signal reconnaissance receiver is passive.However the FMCW radar which is introduced in the second part of this dissertation is a kind of active detection radar.With the rapid development of economy in China,the car ownership is increasing dramatically.Meanwhile,the traffic safety issues are also increasingly serious.In the second part of this paper,the frequency modulated continuous wave(FMCW)radar signal processing is introduced,and it is an intelligent information acquisition equipment used in the field of traffic safety.FMCW radar uses frequency modulated continuous wave signal as the transmitting signal to obtain the target information.This radar has the advantages of no distance ambiguity,high accuracy of ranging and velocity measurement,light weight,small size and low probability of interception.This dissertation mainly introduces the relevant principle of FMCW radar and the design process of FPGA algorithm,based on the provincial key scientific research project of the radar signal processing taken over by our laboratory.In this part,the dissertation firstly introduces how to use the FMCW radar to get the information about the distance,velocity and azimuth of the target.And then this part discusses the causes of the phenomenon of range-velocity decoupling and how to solve the problem.Since FMCW radar signal processor is mainly aimed at moving targets,this di ssertation also introduces how to get rid of the interference of fixed targets and solve the problem of multi-target display.This dissertation only introduces some parts of the project and mainly introduces the algorithm design of FMCW radar signal processing in FPGA.In the part of FPGA algorithm design,the dissertation introduced in detail the data processing procedure for two dimensional FFT operation and cancellation,and includes the data storage structure in each module.