回旋行波管相位特性研究
发布时间：2019-01-09 15:28
【摘要】：作为大功率宽带毫米波源,回旋放大器是下一代远距离高分辨率成像雷达发射机的必然选择,回旋放大器要实现雷达应用,其相位特性必须满足雷达整机要求。主要指标包括相位时间稳定度,相位随输入频率变化的连续性(相频特性),相位随输入幅值变化的连续性(幅相特性),相位随外加电压、发射电流变化趋势等指标。雷达整机对这些指标有严格要求,同时这些指标也影响雷达接收机与发射机配套单元的设计。这些参量与回旋行波管的高频结构共同(边界条件)决定了注波互作用过程,必须建立这些参量在给定边界条件下对输出相位影响的物理模型,才能有效优化回旋行波管的高频结构,使其输出相位达到雷达整机的要求。普通行波管的相位特性的研究已开展多年,分别进行了相位的冷场特性及热场非线性的特性的研究,相位的一致性理论与仿真研究,并在此基础上进行了相位一致性行波管研制工作;研究了相位噪声的来源对雷达作用距离的影响,及相噪抑制技术。通过以上相位特性的研究使行波管广泛用于各类雷达、通信及以对抗系统中。但回旋行波管的雷达应用还处于起步阶段,其相位问题的研究国内外尚无文献报道。本论文是主要是对是对回旋行波管的输出相位进行了分析研究。对输入耦合器和输出渐变段进行了优化分析设计。分析了回旋行波管输出相位的决定性因素。对多模及反射条件下冷场相位随边界及工作频率变化问题进行分析研究,得出保持冷场相位随频率连续变化的关键是保证电磁波在整管内单模,小反射耦合与传播的结论。对冷场耦合过程中高模式纯度低反射技术进行分析研究,分析了输入耦合器的耦合缝改变对相位所产生的影响,耦合缝的位置固定的情况下其他因素对输出相位所产生的影响,对耦合器外腔宽带模式隔离技术和高耦合小扰动技术进行了简要的分析。对冷场传播过程中高模式纯度低反射技术进行分析说明。对高频冷场相位随外界变化控制技术进行分析说明。然后是对冷场相位测试技术进行了简单的说明,包括耦合器冷场测试技术、高频加载段的冷场相位测试以及输出渐变段冷场相位测试技术。最后是对回旋行波管的热场相位进行简单的理论分析与编程计算分析,分析了热场相位稳态情况下随外界条件变化趋势问题,用大信号以及小信号理论进行了理论推导。对热场相位在时变多模状态下随时间变化问题进行了简要分析。
[Abstract]:As a high-power wideband millimeter-wave source, gyroscope amplifier is the inevitable choice of the next generation of long-range high-resolution imaging radar transmitter. In order to realize radar application, the phase characteristics of gyroscope amplifier must meet the requirements of the whole radar machine. The main parameters include the stability of phase time, the continuity of phase with input frequency (phase frequency), the continuity of phase with input amplitude (amplitude and phase characteristic), the variation trend of phase with applied voltage and emission current, etc. The radar machine has strict requirements for these indexes, and these indexes also affect the design of the matching units of radar receiver and transmitter. These parameters and the high frequency structure of the gyrotron determine the beam-wave interaction process. The physical model of the effect of these parameters on the output phase under given boundary conditions must be established. In order to optimize the high frequency structure of gyrotron TWT effectively, the output phase can meet the requirements of radar. The phase characteristics of ordinary TWT have been studied for many years. The phase characteristics of cold field and thermal field, the theory of phase consistency and the simulation are studied respectively. On this basis, the phase consistent TWT is developed. The effect of the source of phase noise on radar range and the technique of phase noise suppression are studied. TWT is widely used in radar, communication and countermeasure systems through the study of phase characteristics above. However, the radar application of gyrotron is still in its infancy, and the study of its phase has not been reported in domestic and foreign literature. In this thesis, the output phase of gyrotron is studied. The input coupler and output gradient section are optimized and designed. The decisive factors of the output phase of the gyrotron are analyzed. The variation of the phase of the cold field with the boundary and the working frequency under the condition of multimode and reflection is analyzed and studied. It is concluded that the key to keep the phase of the cold field changing continuously with the frequency is to ensure the electromagnetic wave to be coupled and propagated in single mode and small reflection in the whole tube. The technique of high mode purity and low reflection in the process of cold field coupling is analyzed. The effect of the coupling slot change of the input coupler on the phase and the effect of other factors on the output phase under the condition of fixed position of the coupling slot are analyzed. The broadband mode isolation technique and the high coupling small disturbance technique for the external cavity of coupler are briefly analyzed. The technique of high mode purity and low reflection in the process of cold field propagation is analyzed and explained. The control technology of the phase change of high frequency cold field with the outside environment is analyzed and explained. Then the cold field phase measurement technology is introduced, including coupler cold field measurement technology, high frequency loading phase measurement and output gradient phase measurement technology. Finally, a simple theoretical analysis and programming analysis of the thermal field phase of the gyrotron traveling wave tube are carried out, and the trend of the thermal field phase changing with the external conditions under the steady state condition of the thermal field is analyzed. The theoretical derivation is carried out by using the large signal theory and the small signal theory. The change of thermal field phase with time in time-varying multimode state is analyzed briefly.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN124
本文编号：2405809
[Abstract]:As a high-power wideband millimeter-wave source, gyroscope amplifier is the inevitable choice of the next generation of long-range high-resolution imaging radar transmitter. In order to realize radar application, the phase characteristics of gyroscope amplifier must meet the requirements of the whole radar machine. The main parameters include the stability of phase time, the continuity of phase with input frequency (phase frequency), the continuity of phase with input amplitude (amplitude and phase characteristic), the variation trend of phase with applied voltage and emission current, etc. The radar machine has strict requirements for these indexes, and these indexes also affect the design of the matching units of radar receiver and transmitter. These parameters and the high frequency structure of the gyrotron determine the beam-wave interaction process. The physical model of the effect of these parameters on the output phase under given boundary conditions must be established. In order to optimize the high frequency structure of gyrotron TWT effectively, the output phase can meet the requirements of radar. The phase characteristics of ordinary TWT have been studied for many years. The phase characteristics of cold field and thermal field, the theory of phase consistency and the simulation are studied respectively. On this basis, the phase consistent TWT is developed. The effect of the source of phase noise on radar range and the technique of phase noise suppression are studied. TWT is widely used in radar, communication and countermeasure systems through the study of phase characteristics above. However, the radar application of gyrotron is still in its infancy, and the study of its phase has not been reported in domestic and foreign literature. In this thesis, the output phase of gyrotron is studied. The input coupler and output gradient section are optimized and designed. The decisive factors of the output phase of the gyrotron are analyzed. The variation of the phase of the cold field with the boundary and the working frequency under the condition of multimode and reflection is analyzed and studied. It is concluded that the key to keep the phase of the cold field changing continuously with the frequency is to ensure the electromagnetic wave to be coupled and propagated in single mode and small reflection in the whole tube. The technique of high mode purity and low reflection in the process of cold field coupling is analyzed. The effect of the coupling slot change of the input coupler on the phase and the effect of other factors on the output phase under the condition of fixed position of the coupling slot are analyzed. The broadband mode isolation technique and the high coupling small disturbance technique for the external cavity of coupler are briefly analyzed. The technique of high mode purity and low reflection in the process of cold field propagation is analyzed and explained. The control technology of the phase change of high frequency cold field with the outside environment is analyzed and explained. Then the cold field phase measurement technology is introduced, including coupler cold field measurement technology, high frequency loading phase measurement and output gradient phase measurement technology. Finally, a simple theoretical analysis and programming analysis of the thermal field phase of the gyrotron traveling wave tube are carried out, and the trend of the thermal field phase changing with the external conditions under the steady state condition of the thermal field is analyzed. The theoretical derivation is carried out by using the large signal theory and the small signal theory. The change of thermal field phase with time in time-varying multimode state is analyzed briefly.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN124
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