【作者】 潘竞楠；

【导师】 皇甫江涛； 冉立新；

【作者基本信息】 浙江大学 ， 电磁场与微波技术， 2011， 硕士

【摘要】 雷达是探测空域内目标物体的距离、速度、角度位置等信息的重要手段之一。随着信息技术的不断发展,越来越多的新技术被应用于雷达系统。零中频技术作为接收机的一种新型方案,可以有效地简化电路结构,缩小硬件体积,减少功率消耗,降低生产成本。因此,将零中频技术引入雷达接收机系统已经引起了越来越多的研究机构关注。按照辐射类型分类,雷达可分为脉冲雷达和连续波雷达。脉冲压缩雷达具有在保证平均发射功率的基础上实现较高距离分辨力的优势,因此在各个领域都有着广泛的应用。本文提出了一种新型零中频接收机及距离模糊函数补偿算法,可应用于脉冲压缩雷达。与传统零中频接收机不同的是,新型零中频接收机通过特定滤波器直接滤除直流偏移和低频噪声,有效地克服了它们对信号质量的影响,降低了硬件实现难度。针对这种新型接收机产生的雷达距离模糊函数信噪比恶化问题,本文采用新型距离模糊函数补偿算法对其进行有效补偿,保证雷达距离探测性能。此研究使得脉冲压缩雷达既可以应用零中频接收机体系实现硬件的小型化,低功耗,同时也保证雷达仍具有良好的距离探测性能。本文也给出了新型零中频接收机的实现方法和距离模糊函数补偿算法的基本推导,通过MATLAB仿真和电路实验验证了新型接收机和补偿算法的有效性。实验系统新颖地应用直接数字合成技术生成可灵活切换的多种回波信号,同时,为了克服直流偏移和低频噪声,提高灵敏度,采用宽带有源滤波器进行滤波,有利于接收机小型化。更多还原

【Abstract】 Radar is one of the most important techniques to detect location, velocity and angle of the target objects. With the development of information technology, more and more new methods are applied in Radar system. Zero-IF receiver is a new architecture of receiver, which can efficiently simplify circuit structure, minimize the size of hardware, low power consumption and save the production cost. Thus, to apply zero-IF receiver in Radar system has attracted more and more research interests.Radar can be divided as continuous wave radar and pulse radar. Pulse compression radar can achieve high range resolution with proper transmitting power. For this reason, it is widely used in various areas.This article proposes a new zero-IF receiver and a new compensation algorithm for range resolution. This new zero-IF receiver directly filters the direct current offset and low frequency, which can low the complexity of hardware significantly. This article also develops a corresponding method to compensate the deterioration caused by the filter. This research proves that pulse compression radar can minimize its size and low the power consumption by using new zero-IF receiver, and also keeps radar’s range detection precision.This article presents how to design the new zero-IF receiver and the deduction of this compensation algorithm, as well as its performance in simulation and experiments. The experiment is supported by the novel design of direct digital synthesis signal generator as echo signal generator and easy integrated filters.更多还原