摘要
提高主动式无线探测系统的抗干扰性能有效方法是在随机时间输出不同调制模式的信号,其中多模信号发生器是系统的核心;为了模拟不同调制模式的信号输出及随机时间下信号的快速转换,设计了一种基于DDS的多模信号发生器;系统以DDS为核心,总体采用CPLD与DDS芯片相结合的设计,外置FLASH芯片为信号控制字存储单元;该系统最高频率达120MHz,储存11种常用信号并可输出外部定义信号,转换速度为2.5μs。实验结果表明,该系统具有发生信号种类多、转换速度快且精度高等特点,可以广泛应用于实验室条件和各种无线探测,微波通信的频率合成信源抗干扰领域。
In order to simulate the output of different modulation mode of signals and fast conversion of signals in random time, the thesis brings out a new design of signal generator with multi--mode based on DDS. The main module of the system is combined of CPLD, DDS chips and flash memory. The experiment shows that it has advantages of signal with fast generating, simulating various signals, high accuracy. It can be widely used in fields of laboratory, frequency synthesis in radar detection and microwave communication system.
出处
《计算机测量与控制》
CSCD
北大核心
2010年第3期731-733,共3页
Computer Measurement &Control
