Study And Design Of Pulse Doppler Radar Simulation Experiment Platform

With the rapid development of radar-jamming and anti-jamming technology, the testing of radar interference counterwork technology, which mainly attributable to the high cost, hard to organization and with high risks, has become a major issue in front of the engineers and technicians. For these reasons, people begin to study the radar simulator to cut down costs, simplify procedures, and reduce risk. The simulation of radar system with computer simulation technology is economic, efficient, safe, repeatable and easy to control, which has become the precursor technology in aspect of radar system scheme argumentation, equipment development and debugging, radar countermeasures technology testing, weapons performance testing and evaluation etc. It is one of the hot issues in the field of radar technology research. The Pulse-Doppler (PD) radar as a representative of advanced radar system, of which the simulation system has developed widely and been learned in depth.From the point of view of interference counterwork technology test, by using personal computer, this thesis mainly discusses the simulation of the bottom function and display control terminal in PD radar interference counterwork experiment platform. In terms of signal processing, the models and simulating methods of key techniques in simulated radar system are concerned. And then the display control interface of the experiment platform is designed. The main jobs of this article are as follows:Firstly, According to the process of radar, the simulation of radar system can be divided into four sections, including signal environment simulation, signal processing simulation, data processing simulation and display control terminal simulation. On the basis of PD radar principles and main goal, the framework and basic elements of platform is archived. And at last, this article mainly concerns with the modeling and simulation of signal environment, the core parts of signal processing and display control terminal.Secondly, in signal environment part, from the perspective of signal and clutter, the modeling and emulation of radar transmit signals, receiver noises and radar clutter is discussed. In terms of transmit signal, design indicators of signal in PD radar are given with some typical waveforms, and then the constant focus on the simulation of single-frequency pulse train by computer; In the receiver noise aspect, the generation method of [0,1] uniformly distributed random variables is concerned, and on the basis of it, the mathematical model and simulation algorithms of Gaussian random variables are discussed; In the radar clutter part, the zero-memory nonlinearity method,by which the Rayleigh distributed clutter can be simulated, is mainly studied. At last, radar signal environment has been constructed by coherent pulse train, Gaussian noise and radar clutter, the magnitude of which is Rayleigh distribution and the power spectrum is Gaussian type.Thirdly, in signal processing part, the function, principle and implementation methods of the modules, such as orthogonal coherent detection, range gate storage, Doppler filtering and CFAR processing, are described in detail. The key techniques of signal processing are stressed, including orthogonal mixing low-pass filter, FFT, and CAGO-CFAR. At last, with the simulating echo, simulation works including the IF signal sampling and orthogonal coherent detection, range gate storage by two dimension array, Doppler filtering based; on FFT, constant false alarm processing by CAGO, are completed. By the analysis of simulation result, the preciseness and effectiveness of the model and simulation method are proved.Finally, in display control section, the layout, logic and design methods of the terminal are studied by display part, control logic part, interface and outer part. In terms of display, P-type radar display, experimental and simulated radar target figure, simulation parameters window are designed based on single document interface framework; In the logic aspect, the steps and implementation methods of system menus, tool buttons are introduced, and the enable relationship of every logic cell is stressed; In the interface and outer part, the structure of platform data arid elements of display and control interface outer part are given, then the design method and process of outer data interface, which based on dialog box, are mainly discussed. At last, on personal computer, the display control terminal of test platform is designed and completed, of which the operation interface includes title bar, menu bar, toolbar, status bar and client area, that is in line with the standard Windows application program interface.