【作者】 陈雷；

【导师】 陈书贞；

【作者基本信息】 燕山大学 ， 电磁场与微波技术， 2014， 硕士

【摘要】 现代的电子对抗战促使数字射频存储器技术的发展，数字射频存储器通过对捕获到的射频信号进行高速采集、存储变换、精确重构来实现对目标的有效干扰。目前已经能够适应在快速多变、复杂环境下的干扰，由于干扰信号和被干扰信号之间具有很高的相干性，因此被广泛应用于军用雷达系统中。随着集成电路的发展，数字射频存储器技术也在不断改进和完善，为了适应先进雷达系统的需求，发展宽带数字射频存储器系统已经成为当务之急。本文通过深入研究数字射频存储器的工作原理和现有技术，对传统的数字射频存储器进行改进和完善，设计了一套大带宽的数字射频存储器，本系统以一片高性能的现场可编程门阵列为核心，采用高速模数转换器和数模转换器完成了数据存储和处理的过程，与现有的数字射频存储器相比，在带宽上有所突破和创新。主要完成的工作如下：首先，根据使用要求，制定宽带数字射频存储器系统的硬件设计方案，为满足高速采集的需求，采用了合适的现场可编程门阵列作为信号处理芯片，确定了系统的核心功能区域，从而完成高速模数转换器和数模转换器以及外围电路的设计。原理图设计中，考虑到系统的可行性问题，对关键电源管理模块进行前仿真测试，仿真结果验证了所设计的模块符合实验要求。其次，对设计好的原理图进行PCB制板，通过对叠层和走线规则的合理设计，使阻抗达到最佳匹配，以适应高速信号在板间的有效传输。同时兼顾电磁特性，采取相应的措施以抑制电磁辐射，如对信号进行蛇形布线、有效接地等。最后，搭建宽带数字射频存储器的硬件测试平台，对系统进行测试，测试结果显示，相比于传统1GHz以下带宽的数字射频存储器，本系统在4.8Gsps采样频率下对1.2GHz信号进行采集，模数转换器采集到信号的杂散达到70dBc，数模转换器采集到的信号杂散达到65dBc，可见本系统对宽带信号的处理基本可以满足应用的要求，可以进行雷达回波信号的模拟，具有一定的工程应用意义。更多还原

【Abstract】 Modern electronic warfare prompted the development of DRFM (digital radiofrequency memory) technology. In order to achieve effective interference to the target,DRFM have a high speed data sampling, storaging and accurate reconstruction. Atpresent, it has been able to adapt to interference in a rapid changeable and complexenvironment. Because of the high coherence between the signal and the interferencesignal, the DRFM is widely used in military radar systems. With the development ofintegrated circuits, DRFM technology is also undergoing continuous improvement. Inorder to meet the requirement of advanced radar systems, the broadband DRFM systemdevelopment has become the urgent matter.Based on the principle of DRFM and the existing technology, this paper make aresearch and improvement to the traditional DRFM system, and design a set ofbroadband DRFM as well. The broadband DRFM system regards the high-performanceFPGA as a core, with a ADC and a DAC sampling and reconstruction. Compared withthe previous sysytem, it has some breakthrough and innovation in the bandwidth. Themain work is as follows:First of all, according to the requirement, develop the design scheme of thebroadband DRFM system, In order to satisfy the demand of high-speed data sampling,select a appropriate FPGA as the signal processing chip, determine the core of the system,then complete the design of high-speed ADC/DAC and peripheral circuit In theschematic design, considering the feasibility of the system, it has carried on thesimulation test to power management module, and the simulation results show that thedesign of the module can meet the experimental requirements.Secondly, design the PCB board. Through the reasonable design of stack and tracerules, the PCB board can achieve a best matching impedance, and enable the high speedsignal transmit effectively. Considering the electromagnetic characteristics at the sametime, the paper take the corresponding measures to suppress the electromagnetic radiation,such as the design of serpentine routing and effective grounding, etc. Finally, set up the system test platform for debugging and testing. Compared totraditional below1GHz bandwidth DRFM, the results show that the1.2GHz signal canbe achieved70dBc under the4.8GHz frequency sampling by ADC, and65dBc by DAC.Thus, the system of the broadband DRFM has basically meet the requirements of theapplication, and can complete simulation of radar echo signal in some aspect, so it hascertain significance for engineering applications.更多还原