带通采样频率选择与频谱变换  

Spectrum Transform of Band-Pass Sampled Signal and Choosing of Sampling Frequency

作　　者：蔡晓霞[1] 陈红[1] 金虎[1] 

机构地区：[1]电子工程学院,合肥230037

出　　处：《电子对抗》2014年第2期21-24,共4页Electronic Warfare

摘　　要：带通采样可以有效降低数据量，但也可能带来频谱混乱，其关键就是带通采样频率的选取。带通采样定理虽然给出带通模拟信号的最小采样频率，但没有给出不同带通信号的采样频率。文章通过带通采样信号频谱结构的分析，提出低采样速率条件下不发生频谱混叠的条件；针对特定信号和A／D器件，给出频谱不混叠可用的分频数P及采样频率fs；实际接收信号的分析结果表明，论文提出的采样频率选择方法有效。Band-pass sampling can reduce the amount of data effectively. But band-pass sampiing may bring spectrum confusion. The key is the choosing of band-pass sampling frequency. Band-pass sampling theorem gives the allowed minimum sampling frequency and the sampling frequency for different signal is unknown. In this paper, the spectrum configuration of band- pass sampling is analyzed, and the need that there is no spectrum confusion under the condition of low sampling rate is put forward. For a given signal and A/D device, the practicable number of frequency dividing p and sampling frequency fs are proposed. The analysis of real receiving signal indicates that the choice method is availability.

关 键 词：带通采样 分频数 频谱混叠 

分 类 号：TN957.51[电子电信—信号与信息处理]