Suitable For Radar Detection Of The Chaotic Signal Preprocessing Algorithm Research

Wideband signals have a lot of performance advantages in radar and communication applications,such as high range-resolution,good electromagnetic compatibility,anti-jamming ability,and low-interception probablity.Since 1960,much attention has been taken on the signal research and generated great advances on signal generation,analyses and processing.With the advance on the new theroy and techniques,the new results appear as sequal.Chaotic signal,generated by deterministic systems,can be easily implemented by a simple circuit and controlled to the desired states.Since its founding,the singal has attaracted wide interests in applications.With the development of chaotic theory and appeal in applications,this dissertation mainly studies the generation,analysis and processing of chaotic signals.On the basis of analyzing Lorenz chaotic system feathers and the elementary theory of radar,basis research is done to the radar waverom signal design.In this thesis,waveforms will be generated from the well-studied Lorenz system.Each waveform from the Lorenz system can be fully characterized by three parameters (σ,b,and r) and a set of initial conditions,(xo,yo,zo).The particular parameter values greatly affect quality of the Lorenz waveform as quasi-orthogonal radar waveform. Therefore,this thesis conducts a parameter study to quantify how the parameters affect various radar waveform metrics.Additionally,this thesis take a typical radar signal which formed by chaos Loenz mapping as an example,analysis its auto-correlation,PRMS,mutual correlation characteristic as well as the ambiguity function,the simulation result indicated that the chaos radar signal's relevance is better,has good speed and range resolution,thus further certificates the feasibility of chaos radar profile signal design.Finally , the digital implementation by Programmable logic devise-field programmable gate array(FPGA) for discretized Lorenz system.We use DSP Builder toolbox of Simulink to carry on the model of discretized continuous chaotic systems,after compiling,transform them into hardware description language-VHDL,and use Quartus II which is the software developed by Altera Corporation to synthesis and simulate the circuit's design.The implementation details are given and confirm the feasibility of the digital implementation.The research in this thesis can be used to implement any chaotic systems.The chaotic signals produced are useful for practical applications and chaotic theory.