多通道中频采样数字下变频应用技术研究

摘要

The amplitude-phase consistency and big bandwidth are the difficulties of multi-channel digital receiver. An IF sampling digital down-conversion technology program of 20-channel is proposed. The safeguards of data flow synchronization and amplitude and phase consistency between channels of the multi-channel digital down-conversion are provided. And the IQ imbalance is analyzed. The real-time digital down-conversion processing of 20-channel 80 MHz IF sampling and 20 MHz bandwidth is achieved. The test' s results show that the system has good data synchronization, amplitude and phase consistency and IQ balance for each channel.%针对多通道数字接收中幅相一致性和大带宽的难点,提出了一个20通道中频采样数字下变频的技术方案.该方案为多通道数字下变频的数据流同步和通道间幅相一致性问题提供了保证措施,对IQ不平衡进行了分析,实现了20通道80MHz中频采样20 MHz带宽的实时数字下变频处理.测试结果表明,系统各通道具有良好的数据同步性、通道间幅相一致性和IQ平衡性.