数字阵列雷达发射多波束关键技术研究
发布时间：2018-07-24 08:52
【摘要】：数字相控阵雷达因其多工作模式,多目标跟踪等优点,现正广泛的应用于军事、民用领域,而这些优点的充分运用是与多波束技术紧密相关的。目前,接收多波束技术已经相当成熟了,而与之对应的发射多波束技术却还有很多的研究空间。本论文以阵列发射基本原理为基础,以数字阵为研究背景,深入研究了数字阵列同时多波束发射的机理、可能的技术途径和特点、以及实现过程中遇到的一些工程问题,给出了详细的理论分析和完整的仿真结果,为数字阵列同时发射多波束的工程应用提供理论支撑。本文主要从下面几个方面展开研究工作:1.介绍数字相控阵雷达的发展历史,并分析比较传统相控阵的工作原理(主要是时分模式),对于多目标同时工作存在着不足;而采用了数字阵发射多波束技术则可以在空域多个范围内同时工作,甚至可以多种工作模式同时工作。从这个对比中可以发现数字阵发射多波束的研究意义。2.以波束形成算法为基础,分析研究三种发射多波束的算法:基于FFT的发射多波束算法,基于正交投影的发射多波束算法,基于子阵的发射多波束算法。根据算法的分析和仿真的对比可以发现,基于正交投影的发射多波束算法更适合于数字阵的同时发射多波束形成。3.在算法实现的过程中,会产生很多工程问题,本文就发射多波束系统在实现过程遇到的若干问题进行了分析仿真,包括通道间幅相不一致,信号加权合并的位置,算法实现的实际方法。通过分析,为实际解决这些工程问题提供理论依据。4.作为发射端主要的非线性来源,本文重点研究了功率放大器对发射多波束的影响。首先,建立输入信号形式和功率放大器模型。接着分析功放输出信号形式,从分析结果可以发现,输出信号可以分成原信号和干扰信号两种形式,通过两种信号的功率比可以衡量功放的非线性对波束信号的影响。最后通过仿真发现在无记忆功放中,功放对信号的影响与信号的形式有关;而在记忆功放中,记忆效应在信号能量弱的时候表现更明显,非线性在信号能量强时表现更明显。结论为设计功放提供了理论依据和参考。
[Abstract]:Digital phased array radar is widely used in military and civil fields because of its advantages of multi-mode and multi-target tracking. The full application of these advantages is closely related to multi-beam technology. At present, the receiving multi-beam technology has been quite mature, but the corresponding multi-beam transmission technology still has a lot of research space. Based on the basic principle of array transmission and the background of digital array, the mechanism, possible technical approaches and characteristics of simultaneous multi-beam transmission of digital array are studied in this paper, and some engineering problems encountered in the process of implementation are also discussed. Detailed theoretical analysis and complete simulation results are given, which provide theoretical support for the engineering application of digital array simultaneously transmitting multi-beam. This paper mainly from the following aspects of research work: 1. This paper introduces the development history of digital phased array radar, and analyzes and compares the working principle of traditional phased array (mainly time-division mode). The digital array transmitting multi-beam technology can work simultaneously in multiple ranges of airspace or even in multiple modes of operation. From this comparison, we can find the significance of the digital array transmitting multi-beam. Based on the beamforming algorithm, three kinds of transmit multi-beam algorithms are analyzed and studied: one based on FFT, one based on orthogonal projection, and one based on subarray. According to the analysis of the algorithm and the comparison of simulation, it can be found that the transmit multi-beam algorithm based on orthogonal projection is more suitable for simultaneous transmitting multi-beam formation of digital array. 3. During the implementation of the algorithm, many engineering problems will arise. This paper analyzes and simulates some problems encountered in the implementation process of the transmitting multi-beam system, including the position of the amplitude and phase inconsistency between channels, the position of signal weighted combination, and so on. Algorithm implementation of the actual method. Through the analysis, provides the theoretical basis for the practical solution of these engineering problems. 4. 4. As the main nonlinear source of transmitter, this paper focuses on the influence of power amplifier on transmitting multi-beam. First, the input signal form and the power amplifier model are established. From the analysis results, we can find that the output signal can be divided into two forms: the original signal and the interference signal. Through the power ratio of the two signals, the influence of the nonlinear power amplifier on the beam signal can be measured. Finally, it is found that in memoryless amplifier, the effect of power amplifier on signal is related to the form of signal, while in memory amplifier, the memory effect is more obvious when the signal energy is weak, and the nonlinearity is more obvious when the signal energy is strong. Conclusion it provides theoretical basis and reference for designing power amplifier.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN958.92
本文编号：2140856
[Abstract]:Digital phased array radar is widely used in military and civil fields because of its advantages of multi-mode and multi-target tracking. The full application of these advantages is closely related to multi-beam technology. At present, the receiving multi-beam technology has been quite mature, but the corresponding multi-beam transmission technology still has a lot of research space. Based on the basic principle of array transmission and the background of digital array, the mechanism, possible technical approaches and characteristics of simultaneous multi-beam transmission of digital array are studied in this paper, and some engineering problems encountered in the process of implementation are also discussed. Detailed theoretical analysis and complete simulation results are given, which provide theoretical support for the engineering application of digital array simultaneously transmitting multi-beam. This paper mainly from the following aspects of research work: 1. This paper introduces the development history of digital phased array radar, and analyzes and compares the working principle of traditional phased array (mainly time-division mode). The digital array transmitting multi-beam technology can work simultaneously in multiple ranges of airspace or even in multiple modes of operation. From this comparison, we can find the significance of the digital array transmitting multi-beam. Based on the beamforming algorithm, three kinds of transmit multi-beam algorithms are analyzed and studied: one based on FFT, one based on orthogonal projection, and one based on subarray. According to the analysis of the algorithm and the comparison of simulation, it can be found that the transmit multi-beam algorithm based on orthogonal projection is more suitable for simultaneous transmitting multi-beam formation of digital array. 3. During the implementation of the algorithm, many engineering problems will arise. This paper analyzes and simulates some problems encountered in the implementation process of the transmitting multi-beam system, including the position of the amplitude and phase inconsistency between channels, the position of signal weighted combination, and so on. Algorithm implementation of the actual method. Through the analysis, provides the theoretical basis for the practical solution of these engineering problems. 4. 4. As the main nonlinear source of transmitter, this paper focuses on the influence of power amplifier on transmitting multi-beam. First, the input signal form and the power amplifier model are established. From the analysis results, we can find that the output signal can be divided into two forms: the original signal and the interference signal. Through the power ratio of the two signals, the influence of the nonlinear power amplifier on the beam signal can be measured. Finally, it is found that in memoryless amplifier, the effect of power amplifier on signal is related to the form of signal, while in memory amplifier, the memory effect is more obvious when the signal energy is weak, and the nonlinearity is more obvious when the signal energy is strong. Conclusion it provides theoretical basis and reference for designing power amplifier.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN958.92
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