基于FPGA的QPSK信号干扰源设计

Design of QPSK Signal Interference Source Based on FPGA

摘要:

针对QPSK调制方式特点,设计了基于FPGA的信号干扰源,分析了系统干扰原理；利用m序列生成均匀白噪声,采用地址法完成高斯白噪声转换；以Logistic混沌映射电路作为信源,采用直接数字频率合成技术产生正弦信号作为载波,用VHDL语言设计FPGA与单片机的接口电路；在单片机控制下,用于FPGA生成干扰信号经AD9760实现数模转换；仿真和实验表明,该系统精度高,干扰参数易于控制修改,满足实际要求,并且稍加改动可生成多路同步干扰信号。

Abstract:

According to the characteristics of QPSK modulation method, a signal Interference source based on FPGA is designed. The principle of jamming is analyzed; the m sequency is used to generate homogeneous distribution, it is translated to Gaussian noise by address method; Logistic chaotic circuit is used as signal source; direct digital frequency synthesize is used to generate sine wave as carrier; VHDL is used to design FPGA and MCU interface circuit; under control of MCU, the interference signals in FPGA is produced by AD9760 analog-to-digital conversion. The simulation and experiment show that the system has high accuracy and its interference parameters are easy adjusted. The system meets the actual demand and can generate multi-channel synchronous jamming signal.