The Design Of Complex Distributed Localization Algorithm For Low-Altitude Targets

In recent years, with the rapid development of low-flying weapon, which can fly in the ground radar detection blind area, it inevitable produces serious threat to low-altitude defense system, so sound localization gradually become a hot direction of low-altitude target positioning technology research. The paper taking a project as the background, combines with the low-altitude target acoustic field characteristics, studies distributed composite localization algorithm in the low-altitude target positioning system.The paper puts forward a distributed bybrid localization algorithm based on the analysis of development trend and advantages of low-altitude target. Comparing three kinds of low-altitude target localization algorithm from type and transmission mode of low-altitude target noise source, this paper adopts the passive acoustic localization algorithm based on time delay estimation. The paper’s analysis mainly from the two key parts, time delay estimation and optimization of the layout of radar stations. Firstly, the paper compares the basic cross-correlation and generalized cross-correlation algorithm, the experimental results show that the generalized cross-correlation is superior to the basic and cross-correlation, the relative time delay precision is higher. And then analyzes optimization of the layout of radar stations and proposes a kind of Geometric Dilution of Precision. At the same time, studies the common station distributions by simulation analysis, the results show that star-model station is better than rhombus-model station.The paper uses mathematical derivation of a single station mathematical model and error analysis to study the low-altitude near field goal. The results show that, under the assumptions of low-altitude targets, it consistent with the positioning accuracy requirements. For long-range targeting, positioning a single station model, simulation results show that the orientation to meet the accuracy requirements, but the positioning accuracy of large deviations. Therefore proposes a single stand to set direction and a jointly distributed complex mathematical model positioning location. Through the simulation analysis, simulation results show that the positioning accuracy to meet the requirements. The paper proposes low-altitude targets location data fusion model on the basis of the analysis, carrying on the coordinate’s data fusion by dynamic weighting method to the low-altitude near-field and far-field. So it can take full advantage of the complementary nature among sensors positioning to improve low-altitude targets accuracy.On the basis of the simulation results, combining with VC++ and MATLAB, designs the composite localization algorithm for low-altitude target. And then analysis the application of related modules and mixed programming detestably. Finally, against near-field low-altitude and far-field low-targeting targeting, simulation experiments carries out to achieve a visual analysis of localization algorithm. It enables MATLAB programs cross-platform applications, improves the portability of the program simultaneously.