【作者】 张鹏；

【导师】 陆锦辉； 杨文军；

【作者基本信息】 南京理工大学 ， 电子与通信工程， 2008， 硕士

【摘要】 ISAR雷达通过发射宽带信号来获取高的距离分辨率,通过目标与雷达相对位置变化产生的多普勒信息获耳义高的横向分辨率,从而实现对运动目标的微波成像。这利,新体制雷达在目标特性测量、目标识别等方面有着较为广泛的应用前景。本文结合工程实践介绍了一种ISAR相控阵雷达演示验证系统的主要关键技术及工程实现方法。ISAR相控阵雷达演示验证系统采用分布式子阵有源相控阵体制,以窄带、宽带信号交替发射的方式实现目标的ISAR成像。数据处理采用卡尔曼滤波器和自适应能量调度,有较好的目标跟踪性能和灵活的资源分配方式;发射系统由16台高功率宽带发射机组成,发射信号通过馈电网络空问功率合成,实现了较高的功率合成效率和较好的宽带幅相特性;宽带相控阵天线采用延时器+移相器的方案,有效解决了孔径渡越时间对宽带信号的带宽限制,满足宽带成像要求。论文还介绍了系统集成实验,提出宽带幅相误差补偿的新方法,并给出飞机及国际空间站ISAR成像实验数据。更多还原

【Abstract】 ISAR (inverse synthesize aperture radar) can obtain high range resolution by applying wide band signals and high azimuth resolution by the Doppler information which is achieved by the relative movement of the target and the radar. Thus we can get the radar image of moving target. This new mechanism radar can be extensively applied to target character measurement, target identification and so on. This thesis introduces the main techniques and the engineering implementation approaches of a phased array ISAR demonstration system.The distributed active phased subarray mechanism is adopted in the demonstration system. The ISAR image is obtained by transmitting narrowband and wideband signals alternately. The Kalman filter and adaptive energy schedule are applied to data processing, which makes it a better tracking performance and flexible distribution of radar resource. The transmitting system is composed of 16 high power and wideband transmitters. The power is synthesized in air by the transmitting signals which get across the feedback network. The system has a better power synthesis efficiency and wideband amplitude-phase character. Wideband phased array antenna which composed of real time delayers and phase shifters figure out the bandwidth limit of wideband signals which brings by the aperture duration. Then the imaging request is satisfied.This thesis also introduces system integration experiment and a new method of wideband amplitude-phase error compensation. Some ISAR image experiment data of airplanes and the international space station are given.更多还原