基于虚拟仪器与FPGA的多类型信号模拟器设计

Design of Multi-Signal Modulator Based on Virtual Instrument and FPGA

摘要:

随着现有各类信号接收机不断推陈出新，为满足接收机测试所使用的信号多样性、参数可调等需求，对信号产生技术进行了研究，根据现有主流雷达、通信等信号，设计了一种新颖的基于虚拟仪器与FPGA的多类型信号模拟器。其中多类型信号模拟软件使用C语言基于LabWindows/CVI开发。通过模拟软件与FPGA控制数据的传输，使用PCIE接口与总线先将信号数据传输至硬件部分的DDR3存储器中进行缓存，而后从DDR3存储器读取到DAC模块中，最终经数模转换，通过两个通道输出模拟信号。与传统的模拟器相比，所提出的软硬件体系架构在集成度、通用性、灵活性、可扩展性、系统成本等方面均取得较为显著的提升。测试结果表明模拟器能正常工作，性能满足使用需求。

Abstract:

With the development of different types of signal receivers. In order to meet the signals’ requirement of multiple characteristic and parameter adjustability which is used in receivers’ testing, signal production technologies are studied. According to the present radar, communication signal .etc. a new-style multi-signal modulator based on virtual instruments (VI) and field program gate arrays (FPGA) is designed. Multi-types signal modulating software was developed using C language based on LabWindows/CVI. The data transfer is controlled by the software and FPGA. Signal data is stored to Double Data Rate 3Gen (DDR3) Memory via peripheral component interconnect express (PCIE) interface and bus. Then data is red out from DDR3 memory to digital-to-analog converter (DAC) module. Eventually, signals were output using two channels after transferred to analog type. Compared with traditional modulators, great improvements of the proposed software and hardware architecture lie in integration, universality, flexibility, expandability, system cost. The test results proves that modulator can work well, and its performance fulfills the requirement of the design and usage.