Research On Systematic Performance Of Unmanned Aerial Vehicle Airborne Array Antenna

Currently, with the continuous expansion of Unmanned Aerial Vehicle(UAV) application fields, the performance of UAV airborne array antenna system is increasingly important in UAV applications, such as communication, detection, investigation, etc. In the thesis, the main work is carried out to study the various systematic performance parameters of airborne array antenna, and we discuss the effects of the four factors such as the mutual coupling, the amplitude-phase error, array layout and array deformation on the systematic performance of UAV airborne array antenna. Then, it will provide a valuable technical reference for designing UAV airborne array antenna and optimizing systematic performance by summarizing the characteristics and rules of the four factors.Mutual coupling between elements in array antenna directly affects systematic performance of the array antenna, which should not be ignored in the design of the array antenna. It not only changes the gain of the antenna, increases the level of sidelobe, but also makes the pattern distortion, so the compensation of mutual coupling also needs to be addressed. The improved active element pattern technique is applied to analyze the effect of mutual coupling on systematic performance. And then realize the mutual coupling compensation by combing the improved active element pattern technique with the least squares method. Biggest advantage of this combined method is that the mutual coupling compensation coefficient matrix can be obtained directly and quickly while reducing auto and mutual coupling effect caused.Amplitude and phase error is an important factor in the performance of the array antenna system. In this thesis, probability and statistics methods is used to analyze effects of the performance of array antenna system from amplitude and phase error. And the statistical properties of the array antenna pattern is analysed when amplitude and phase error presences. Then summarize the amplitude-phase error characteristics and the law.Array elements that affect the layout of the array antenna performance, this paper studies the number of array elements and the research element spacing affect the performance of the array antenna analysis reveals the relationship between the number of array elements, spacing and orientation gain, sidelobe level.To conformal airborne antenna array, the array deformation is a factor affecting the performance of the system. This paper considers the impact of the array of deformation on performance of conformal array antenna firstly. And for the analysis of the factors which influence the characteristics of the gain, the sidelobe equality. In the deformation compensation, combined with characteristics of deformation, and deficiencies of phase compensation method and least squares method, fourier method proposed to compensate for deformation. And the results show that the effect of the compensation by the fourier method is much better than the former two, also effectively improve the effect of deformation.In the thesis, the models of comformal antenna array and simulation have been accomplished by Ansoft HFSS which an electromagnetic simulation platform. It have analysised the effects of mutual coupling, amplitude and phase errors, array layout and array deformation on performance of airborne array antenna system. Then have summed the four factors the characteristics and laws, and achieve better compensation, reaching optimization airborne antenna array system performance objectives.