T/R组件幅相一致性研究

【作者】 于涛；

【导师】 刘光祜；

【作者基本信息】 电子科技大学 ， 电路与系统， 2008， 硕士

【摘要】 有源相控阵技术是控制阵列天线各单元的相位、幅度以形成空间波束并控制其扫描的技术。T/R组件(Transmit/Receive Modules)是相控阵雷达有源分布阵列天线的核心部件,其性能直接决定了整个雷达系统的性能。T/R组件间发射支路和接收支路的幅度和相位不一致将会导致有源相控阵雷达发射波束和接收波束的波束指向偏移、副瓣电平抬高和天线增益下降,最终影响有源相控阵雷达的指向精度、抗干扰能力和作用距离。本课题在深入了解T/R组件组成和工作机理的基础上,深入研究了导致T/R组件发射支路和接收支路幅度和相位不一致的主要因素,并且对导致T/R组件发射支路幅相不一致的最主要因素——功放组件间幅相不一致进行了定性和定量研究。通过实验具体分析了导致线性脉冲功放组件间和饱和脉冲功放组件间幅相不一致性的主要因素,并根据分析结果提出了提高功放组件间幅相一致性所应采取的设计措施。本课题结合工程需要,设计并实现了一种L波段线性脉冲功放组件,该功放组件最大线性输出功率大于48.0dBm。在采取幅相一致设计措施后,该功放组件在60dB的动态范围内实现了幅度一致性小于0.3dB RMS,相位一致性小于3°RMS的良好指标。更多还原

【Abstract】 Active phased array technology, forms and steers antenna beam by controlling gain and phase of every antenna unit, has been developed as an important mean in modern radar technology. Transmit/Receive(T/R) modules are key elements in active phased array radar.Shifting of antenna main beam, raising of antenna sidelobe and dropping of antenna gain will happen in transmit or receive beam if transmit or receive channels of T/R modules are amplitude-phase inconsistency, and the performance of active phased array radar will be affected.The main reasons for amplitude-phase inconsistency of transmit channel and receive channel are analyzed based on understanding of typical configuration of T/R modules. Qualitative and quantitative analysis on amplitude-phase inconsistency of power amplifier modules are made as they are key elements in transmit channels. The main reasons for amplitude-phase inconsistency of linear pulse power amplifiers and saturated pulse power amplifiers are analyzed by means of experiments, and design considerations that improve the amplitude-phase consistency of power amplifiers are also introduced.One kind of L band linear pulse power amplifier is designed and realized, and its biggest linear output power is 48.0dBm. The amplitude consistency of the L band linear pulse power amplifiers is less than 0.3dB RMS in 60dB dynamic, and their phase consistency is less than 3°RMS in 60dB dynamic owe to the amplitude-phase design measures put forward in this thesis.更多还原