| Focusing on the key problems of simulation and clutter suppression algorithms for the missile-borne radar system, this thesis mainly studies fast modeling of the prototype of the missile-borne radar system and algorithms of clutter suppression. The main research content of the whole paper is demonstrated as follows:The first chapter mainly introduces the background and significance of the research. And then the research actuality of the radar system simulation and clutter suppression with the space-time adaptive processing algorithms is introduced comprehensively. At last, this chapter epitomizes the structure of this article.The second chapter establishes the standard block library of typical radar system on the common platform of Simulink. To solve the problems of unified model, complex debugging, and cumbersome parameter setting, this chapter first establishes the sublibrary of radar simulation signal and signal processing in detail, which includes the LFM signal generator, the Rayleigh clutter generator, the block of matched filter, the block of MTI and MTD, the block of CFAR and a GUI for man-machine interaction. In order to provide convenience for the users to access the blocks in different conditions, this chapter enriches the library of Simulink and lays a foundation on how to model some kind of radar prototype system rapidly.The third chapter sets up a prototype of some kind of frequency-modulated with stepped frequency radar system based on the library established in the second chapter. Firstly, this chapter studies the mathematical model of target echo and clutter, and then establishes an universal model of the squint side-looking clutter and relevant block on Simulink. Secondly, the model of radar antenna and the receiver is introduced briefly. And then the signal processing of the frequency-modulated with stepped frequency radar and two kinds of target pick-up algorithms are analyzed. At last, angle measurement is accomplished using the range profile after being picked up. Finally, a Monte Carlo simulation is represented which certifies the effectiveness of all models.The fourth chapter mainly studies the algorithms of clutter suppression for the missile-borne monopulse radar. This chapter firstly introduces the basic principles of STAP. In order to solve the problem that the full space-time STAP brings about a great amount of calculation, and it cannot be applied to real-time processing, and the missile-borne monopulse radar, this chapter makes an improvement of this algorithm by reducing its dimension. That means reducing the amount of calculation, which makes it possible for real-time processing. Furthermore, by reducing the airspace freedom into 2, this part lays a theoretical foundation on applying the STAP algorithm to the missile-borne monopulse radar. Combining the application background, this chapter extends the side-looking and difference beams STAP algorithm to squint side-looking scenario, and proposes a least squares clutter compensation algorithm. And then, optimal matched filtering and target detection for the compensated data are accomplished. At last, one dimension reduction method in Doppler domain-- ?? ?3 DT algorithm is analyzed to improve the real-time processing performance. The simulation results of this study indicate that using the ?? ?3 DT algorithm can suppress the clutter effectively and highly reduce the computational complexity.The fifth chapter gives a comprehensive summary of the research content of this article and points out the deficiency of the paper and the prospect of the future work. |
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