单路采样在DBF测向中的应用

The application of single-channel sampling on data acquisition in DBF

为了实现数字波束形成(DBF)中的高速数据采集,减小幅相误差,提出了单路采样方案,即每一通道只用一路A/D变换器对射频或中频信号采样,用软件处理方法得到正交双路信号采样值,讨论了中频带通采样及单双通道数据转换的方法.仿真结果表明:该方案减少了由模拟器件带来的I、Q通道的幅相误差,提高了系统的稳定性和可靠性.

To perform high-speed data acquisition in Digital Beam Forming (DBF) and decrease amplitude phase errors, a single-channel sampling scheme is presented. The method of IF band pass sampling and data transformation from single-channel to orthogonal channel is discussed. The computer simulation of three transformation methods shows a great decrease on I、Q amplitude phase errors.