【作者】 张海燕；

【导师】 李正文；

【作者基本信息】 成都理工大学 ， 信号与信息处理， 2004， 硕士

【摘要】 被动无源测向定位在航海、航空、航天、电子战等领域具有十分重要的地位和作用，其主要优点是作用距离远、隐蔽性强。本文以测向系统的组成为基础，研究了单平台情况下利用到达方向、到达时间差、多普勒频率差、相位变化率等参数的测向方法、测向算法、测向精度和性能，并进行了计算机仿真，为无源测向系统的设计和实施提供了重要的理论基础和实验数据。对天线阵通道不一致进行校正是利用天线阵处理信号要解决的问题之一。本研究提出通过辅助信号源对通道增益和相位不一致性进行有源校正的方法。最后，在高速浮点数字信号处理器TMS320C6711系统上实现了五通道测向处理器有源校正和测向算法，达到了性能指标及实时实现。本文主要内容为： 第一章阐述了辐射源无源定位技术研究的历史背景、现状和意义。说明了该技术的研究具有极其重要的理论意义和军事、民用价值。 第二章概述了无线电通信测向原理，包括无线电测向系统组成和分类；无线电测向的主要性能指标；四种主要测向体制的工作原理和特点。 第三章对信道误差的校正问题进行讨论。分析了通道幅相误差产生原因，给出了多基线五元圆形天线模型下的幅相校正过程，在此基础上给出了四种幅相误差校正方法，分析了四种校正方法的特点。 第四章对相位干涉仪进行了较为详细和系统的研究，给出一维相位干涉仪的基本关系式，分析了五通道相位干涉仪测向定位算法及其性能指标，对解相位模糊问题进行了探讨，在CCSS中仿真了测向算法，仿真结果证明了算法的正确性。 第五章进行干涉仪测向系统设计。简述了TI公司的高速浮点数字信号处理器TMS320C6711的主要特点，介绍了其主要结构、软件的开发方法。最后，在TMS320C6711系统上实现了五通道测向处理系统，达到了性能指标及实时实现。 最后，总结了本文的工作，给出研究结果并提出了对辐射源测向问题进一步研究的建议。更多还原

【Abstract】 Passive direction finding of emitter source has been playing an important role in navigation, aviation, aerospace and electronic warfare with its outstanding features such as longer range and better concealment. Based on the configure of direction finding, the location method, algorithm, accuracy and performance for multistations and single station are studied in this thesis, and the computer simulation results are given out. It is important of resolving the performance of antenna array. A technique to estimate and calibrate the performance is developed in this page. Lastly we realized algorithm of calibrate the performance and five channels phase interferometer on high speed float DSP TMS320C6711 and achieved the performance index and real time implementation. The main contents are as following:The first chapter is a brief introduction to direction finding of its backgrounds, present states and importance.The second chapter summarized the principle of radio-communication direction finding, include compose and classify of radio-communication direction finding; the main performance index of radio-communication direction finding; shows the principle and character of four main kinds of direction finding system.The analysis of channel disaccord calibration discussed in Chapter 3. Analysis the cause of channel disaccord of gain and phase, give four methods of gain and phase calibration, computer simulation illustrate the that the methods are effective.In the Chapter 4,the basic relation of phase interferometer of one dimension, two dimensions, and the measurement accuracy and the approach of solving the phase ambiguity in the phase interferometers have been discussed in detail. The equations of target position and its errors in the satellite-born phase interferometer have been also derived.In the Chapter 5,we designed the interferometer direction finding system. It provides a brief overview of the background and major features of DSP, also describes the architecture of TMS320c671h software developing method. Lastly we realized the system.Finally, an overview of author’s work and the prospect of direction finding are presented.更多还原