米波雷達(dá)測角方法研究
[Abstract]:Because of its unique advantages in anti-stealth and anti-radiation missiles, Mibo radar has become the focus of attention all over the world. However, due to the influence of long wavelength and wide beam width, the accuracy of target angle estimation is poor. Therefore, how to improve the angle measurement accuracy of Mew radar is an important research direction. In this paper, based on the research task and the main research subject, the angle measurement method of Mew radar is studied, and several improved angle-measuring algorithms are proposed: first of all, In this paper, some basic angle measuring methods of meter wave radar are studied. The working principle of radar angle measurement and some basic angle measuring methods are introduced, including amplitude method, phase method, maximum signal method, centroid method and monopulse method. The performance, advantages and disadvantages of these methods are simulated by computer experiments, and some problems of these methods are discussed and analyzed. The theoretical analysis and mathematical derivation of the angle detection curve in monopulse method are emphasized. Secondly, the working principle and the principle of the conventional monopulse angular measurement method are introduced, and two improved methods are proposed, one is the improved monopulse angle measurement method and the other is the improved beam scanning method. The improved monopulse angle measurement method is based on the principle of semi-matrix method, the received data is converted from DFT operation to Doppler channel, and some points of the received data are zeroed in the Doppler channel, and then the IDFT operation is carried out. Using the processed data to measure the angle of monopulse; The improved beam-scanning method constructs a new cost function, which simplifies the previous multi-beam scanning to a single search to obtain the angle information of the target, which greatly reduces the computational complexity. Simulation results show that the performance of the two improved algorithms is better than that of the conventional algorithms. Then, the structure model and basic principle of distributed meter wave radar are introduced, and the rough estimation method and accurate estimation method based on ESPRIT algorithm are studied. Rough estimation is an inherent attribute of distributed radar. Using rough estimation method to estimate the angle will result in a large variance and there is no fuzzy angle measurement value. On the contrary, using the accurate estimation method, the variance is smaller and the angle is fuzzy. Therefore, it is necessary to search the estimation value and obtain the real angle of the target. Theoretical analysis and simulation experiments show that the performance of the two methods is very high, and the performance of the accurate estimation method is better than that of the rough estimation method. Finally, according to the structural characteristics of distributed meter wave radar, the influence of baseline length on angle measurement accuracy is further analyzed. With the increasing of baseline length, the angle measurement performance of distributed meter wave radar changes in "V" type. According to the characteristic of distributed meter wave radar with baseline length, an optimal baseline length determination method is proposed. By using this method, the optimal baseline length can be determined and the angle measurement error caused by the structural characteristics of the distributed meter wave radar can be reduced. The effectiveness of the method is verified by computer simulation.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN953.5
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