摘要
目的 解决在超高速数据采集系统中多通道采样技术存在的非等间隔采样、通道增益失配和频谱混叠等问题 .方法 用两路下变频器 ,在带通滤波器通带之间产生1 0 0 %带宽的隔离带 ,利用改进的频分多路采样法实现了新的并行采样 .结果 改进的频分多路采样法只用两路下变频器 ,比原有方法减少了 n- 3路 ,使得设计与实现大大简化 ,由于带通滤波器通带之间有 1 0 0 %带宽的隔离带 ,使频谱混叠问题得到较好地解决 .结论这种新方法有效地避免了多通道采样过程中存在的实际问题 。
Aim To solve problems such as nonuniformly sampling, unmatched channel gain, spectrum overlapping in ultrahigh speed sampling system when multichannel sampling technique is used. Methods A novel method of ultrahigh speed data acquisitions on the principle of frequency division multiplex was proposed. Two down converters were used, and the isolating bandwidth was equal to the bandwidth of BPF. Results The proposed method uses only two down converters, deducting many of them compared with old methods, therefore the design and realization are simplified. Because the isolating bandwidth equals the bandwidth of BPF, the problem of spectrum overlapping is solved better. Conclusion This novel method succeeds in solving the existing problems in multichannel data acquisition, and an easier way is offered.
出处
《北京理工大学学报》
EI
CAS
CSCD
1999年第6期759-763,共5页
Transactions of Beijing Institute of Technology
