干涉测量系统数字基带转换方法研究

Research on Digital Baseband Converting Methods in Interference Measurement System

首先介绍两种典型的适用于干涉测量系统的数字基带转换方法,然后采用并行结构和多相结构对正交混频方法进行改进,得到高效的基于并行下变频的方法。结合多相滤波的高效性与正交混频的灵活性,得到更加高效的多相滤波与正交混频结合法。通过比较两种方法的效率和功耗,得到多相滤波与正交混频结合法性能更优的结论。

Two typical digital baseband converting methods used in interference measurement system are introduced.The method based on parallel NCO uses parallel structure and poly- phase structure to improve the performance of the traditional orthogonal mixing method.Through combining the high efficiency of the method based on poly- phase filter bank channelization and the flexibility of the method based on orthogonal mixing,more efficient digital baseband converting method is proposed.The efficiency and power consumption of the method based on parallel NCO and the proposed method in this paper are compared.The result shows that the proposed method has better performance.