| Along with the mutual competition between the radar system and the electronic reconnaissance receiver,the progress of either party will promote the rapid development of the other party.ICW radar is a new radar system,which has been studied by many experts and scholars at home and abroad,and has made a lot of achievements.ICW radar is developed on the basis of pulse radar and continuous wave radar,taking advantage of its essence,to its dross,which inherits the advantages of pulse radar and continuous wave radar,and abandoned its shortcomings.In order to keep pace with the times,the study of ICW began to develop.How to solve the problem of high efficiency,high speed and high precision parameter estimation for radar reconnaissance receiver in the complex electronic warfare environment is the key problem in this thesis.In this thesis,we will study the method of high precision parameter estimation from the two aspects of theoretical research and hardware implementation:1.In this thesis,the concept of unconventional radar signal is put forward,and the significance of the research on unconventional radar signal is briefly introduced.In this thesis,the time domain,frequency domain and time-frequency domain characteristics of these four kinds of non conventional radar signals are analyzed.According to the frequency domain characteristics of these four kinds of signals,a new method is proposed to convert the frequency modulated interrupted continuous wave into frequency modulated continuous wave.From the two aspects of the acquisition probability and receiver characteristics of the radar reconnaissance receiver,the feasibility of the interrupted continuous wave signal as a kind of LPI signal is analyzed in detail.2.Two kinds of high precision frequency measurement algorithm is proposed for single tone signal,that is the improved iterative interpolation algorithm and the improved histogram,a detailed analysis of the two kinds of algorithms and the specific implementation steps of the two algorithms are given.A method of high precision is proposed to estimate the four characteristic parameter,that is modulation period,initial time shift,initial frequency and modulation bandwidth.The results of detailed analytical parameter estimation are given.The simulation results show the high accuracy of the proposed algorithm.3.The hardware realization of the radar reconnaissance receiver is completed,and the hardware structure,software design and display interface of the receiver are described in detail.In the realization of radar reconnaissance receiver process,we encounter three technical problems,that is the multiple simultaneous signals separation,the cross channel signal processing and the multi core efficient scheduling algorithm,and puts forward specific solutions.Finally,the system test verifies the feasibility,accuracy and precision of the parameter estimation algorithm of frequency modulated interrupted continuous wave. |
PDF Full Text Request