多星時(shí)差無(wú)源定位系統(tǒng)研究
[Abstract]:With the rapid development of electronic technology, modern military activities can not be separated from the support of electronic technology and electronic equipment. Mastering the initiative of electromagnetic wave is equivalent to mastering the initiative of the whole situation. Electronic reconnaissance satellite has become a very effective means of obtaining information because of its large detection range, high sensitivity, strong maneuverability, wide range of reconnaissance frequency, not limited by national and regional factors. Passive location technology is the basis of electronic reconnaissance satellite. It determines the location of target emitter by passive acquisition of radiation, scattering or reflected electromagnetic wave of target radiation source, and in the process of location, It does not actively radiate electromagnetic waves to detect targets, which has good concealment and is of great significance to the development of electronic countermeasures. According to the different positioning methods, passive location can be divided into direction finding cross location, time difference location, frequency difference location, phase difference location and mixed positioning. Among them, the time difference positioning is fast and the accuracy is high, so it is the most widely used multi-star passive location method. Time difference location is also called hyperbolic location. It uses the time difference of the target radiation signal to reach the observation station to determine the target position. The TDOA system consists of four parts: (1) selecting and matching the target signal; (2) estimating the time difference of arrival at each observation station; (3) obtaining the target position using a certain algorithm; (4) analyzing the location error. In this paper, time difference location is systematically studied, pulse pairing, time parameter estimation, location algorithm and error are introduced, simulated and analyzed. The contents are as follows: in the first chapter, the background and significance of the subject are described, and passive location technology is introduced. The present situation of the development of electronic reconnaissance satellite and the direction of its development in the future are given. In the second chapter, the fuzzy problem of high repetition frequency pulse pair and its corresponding solution are introduced, and the simulation of high repetition frequency pulse pair method based on the principle of mutual test equality is carried out to verify the reliability of the algorithm. Then, two methods of time difference estimation: based on unified signal and based on unified time, two algorithms of time difference estimation are presented. The generalized cross-correlation method based on unified signal mode and the third-order cumulant method are simulated and compared, and the performance of the algorithm is verified. In the third chapter, the principle of moveout positioning is introduced, the geometric positioning principle of 2D and 3D is expounded, the coordinate transformation formula between spatial coordinate system and geodetic coordinate system is given, and the precision of time difference positioning is simulated. The positioning accuracy is analyzed under the conditions of different observation stations, different baseline distances and irregular centers. In chapter 4, we introduce the algorithm of time difference location, and describe the linear algorithm and nonlinear algorithm. The least square method and maximum likelihood method are simulated, and the root mean square error (RMS) of the two algorithms is compared. The lower bound of Clemero and the ability to resist error interference are used to verify the localization performance of the algorithm.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TN95
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