伪码调相脉冲多普勒复合探测信号处理技术研究

【作者】 徐元银；

【导师】 赵惠昌；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2009， 硕士

【摘要】 伪码调相脉冲多普勒复合引信综合了伪码体制和脉冲多普勒体制二者的优点,是一种既能定距,又能测速的引信系统。它利用伪码脉冲复合信号的自相关特性对目标进行定距,同时利用多普勒频率实现对目标的速度识别,从而完成对目标距离速度信息的双重识别,增强引信工作的可靠性。本文的内容主要包括以下几个方面:1介绍伪码调相脉冲多普勒复合引信的工作原理,然后利用仿真集成环境Simulink搭建了系统仿真框图,对系统的各个部分进行了详细的仿真分析;并编写代码用MATLAB对部分信号进行详细的仿真分析,在此基础上对多普勒频率的提取方法进行研究。2介绍锁相环频率合成技术,并以ADF4360-0为中心,完成了本系统频率源的设计。3利用ISE6.2b软件和XILINX公司的XC95144CPLD完成了m序列伪码信号发生器、开关控制程序和m序列伪码数字相关器的设计和调试,并利用Modelsim软件对程序进行了仿真。4介绍ADI公司生产的调制芯片AD8349,并以AD8349为主要模块完成了调制电路的设计:介绍并利用解调芯片AD8347完成了解调电路的设计。5最后,根据引信工作的现实环境,对系统进行了抗干扰性能分析。更多还原

【Abstract】 Pseudo-code phase-modulation pulse Doppler combined fuze integrates the advantages of fuze of pseudo-code system and phase-modulation pulse Doppler system, which is a fuze system that can not only measure the distance, but also measure the speed.It utilizes the autocorrelation function characteristics of the pseudo-code pulse combined signal to measure the distance of the objective, and also utilizes Doppler frequency to realize the speed recognition of the objective, so as to realize the dual recognition for the objective distance and speed and strengthen the reliability of the work. The following contents are mainly included in this text:1. The operating principle of the pseudo-code pulse combined signal is introduced, and then the simulation integration environment Simulink is used to establish the system simulation block diagram to analyze each part of the system in details; the codes are prepared, and then MATLAB is used to perform the simulation analysis for some signals in details. Extract method for Doppler frequency is researched on such basis.2. Phase locked loop frequency synthesis technique is introduced. The design of frequency source of this system is completed by taking ADF4360-0 as the center.3. ISE6.2b software and XC95144CPLD of XILINX Company are used to complete the design and commissioning of m-sequence pseudo-code signal generator, switch control procedure and m-sequence pseudo-code digital correlator. Modelsim software is utilized to emulate the procedure.4. The modulation chip AD8349 produced by ADI is introduced, which is used as the main module to complete the design of modulation circuit; the demodulation chip AD8347 is introduced and utilized to complete the design of demodulation circuit.5. At last, anti-interference property of the system has been analyzed according to the actual working conditions of the fuze.更多还原