摘要
直接射频采样技术是数字接收机的发展新趋势。由于ADC器件的水平限制,直接射频采样技术在接收机中的应用受到很大的限制。采用SHA(采样保持器)+ADC的系统结构,设计了一种支持超宽带信号输入的数字接收机,实现了射频信号的直接采样。简述了采样保持器的工作原理,介绍了直接射频采样数字接收机的系统组成,详细介绍了数据采集子板的设计。综合FPGA分析工具CHIPSCOPE与MATLAB软件,对数字接收机进行了测试和指标分析。结果表明,该数字接收机在采样保持器带宽范围内,可以满足常规指标要求,简化了系统设计,降低了成本,具有一定的应用价值。
The technology of direct RF sampling is a new trend of the digital receiver. Limited by ADC device, the application of this technology is not very popular in the receiver. Based on the architecture of SHA（sample and hold amplifier） ＋ ADC, this paper introduces a digital receiver that supports ultra-wide waveband input signal and implements direct sampling of RF signal. A brief introduction is given to the prin- ciple of the sample and hold amplifier. The system architecture of the direct RF sampling digital receiver is described and the sub-board of data acquiring is presented in detail. Combining the CHIPSCOPE, the analy- sis tool of FPGA, and the software of MATLAB, the digital receiver is tested and its features are analyzed. The results show that the features of the digital receiver can meet the need of regular application. The system design is simplified and the cost is reduced.
出处
《雷达科学与技术》
北大核心
2015年第3期320-323,共4页
Radar Science and Technology
关键词
直接射频采样
采样保持器
数据采集子板
数字接收机
direct RF sampling
sample and hold amplifier
sub-board of data acquiring
digital receiver
