【作者】 连迎春；

【导师】 吴文； 高铁；

【作者基本信息】 南京理工大学 ， 电子与通信工程， 2008， 硕士

【摘要】 随着半导体技术,包括各类晶体管、集成电路、信号处理、数据处理和计算机技术等突飞猛进的发展,极大地推进了相控阵雷达技术的发展,并降低了相控阵雷达的造价,当前世界各国新研制的雷达多数为相控阵雷达。相控阵天线依靠控制各通道的相位,实现波束扫描,而通道的幅相变化将影响到阵面性能,因此必须开展阵面校准的方法研究,校准方案反过来又影响着相控阵系统的设计。为达到校准和诊断的目的,专家学者研究了多种方法,如内监测校准法、外监测中场校准法、远场校准法等这些方法具有一定的适用对象,在系统设计时必须考察使用条件。本文以X波段试验阵面为平台,着重研究了外监测技术中极化效应和校准算法。本文分析了线极化的收发天线间极化效应引入误差的形式,进行了研究仿真,给出抑制收发天线间极化效应误差的约束条件;在校准过程中,传统的单路通方法的测试信号通过波束形成网络后,信号功率衰减较大,致使信噪比太低,严重影响到校准结果,本文提出了“局部反相法”,测试过程中子阵级单元全部导通,通过控制某几个通道相位变化,组成线性方程组,解出各单元幅相值,有效解决了传统单路通方法信噪比较低的问题。更多还原

【Abstract】 Along with the rapid development of semiconductor technique as well as those of all kinds of transistors, integrated circuits, signal processing, data processing and computer, technique of phased array radar has been improved greatly while cost has been decreased. At present, phased array radar is the new one mostly developed by different countries.Phased array antenna controls phase of each channel to carry out bean scan. Because variation of amplitude-phase in channel will influence performance of array, research on method for calibrating array is necessary, while calibration scheme will influence design of phased array system inversely. In order to gain the goal of calibration and diagnosis, experts and scholars have researched on many methods that suit to certain objects, and application conditions must be taken into consideration during system design.This paper focus on research polarization effect and calibration arithmetic , based on the X band test bed .In this paper , we analyzed the error mode of polarization effect between transmitting antenna and receiving one . By research and simulation , we proposed the method control the error between transmitting antenna and receiving one caused by polarization . During the calibrating , the test signal of general method which tested channel one by one , attenuate largely by the beam-form net , and the SNR become too low, seriously imposed on the calibration . In this article ,we proposed ’ Method of local phase inversion ’, that all T/R modules of one block work at the same time , and control the phase part of them , then we get linear function , last get all the amplitude and phase of all the units, resolve the problem of low SNR of the general one-by-one method.更多还原