一种基于并行结构的宽带实时数字下变频技术

摘要

提出一种并行处理结构,通过多个数字下变频通道并行处理,能有效降低采样率和数据处理速率,解决超宽带数字中频处理的难题.分析了并行数字下变频技术的原理推导,分析了多路NCO输出相位差及影响信噪比的误差因素,为具体工程设计提供指标分配依据.最后通过实验平台验证方法的正确性.%A presents a parallel processing architecture is described. It can solve some difficult problems of ultra-wideband digital IF processing through multiple channels of parallel processing, which can effectively reduce the sample rate and process cost. The parallel digital down conversion technique principle is deduced, phase difference of multi-NCO's output and error factor for reducing SNR are analyzed, and index distribution basis for the specific engineering design is provided. Finally, its correctness can be verified by experiment.