基于DDS和DQUC的宽带多普勒频率模拟器的设计

Design of Broadband Doppler Frequency Simulator Based on DDS and DQUC Techniques

介绍了直接数字频率合成(DDS)和直接正交上变频(DQUC)的基本原理,提出了基于DDS和DQUC的宽带多普勒频率模拟器设计方案,该方案在微波频段保持了DDS的所有优点,并抑制了在混频器中上变频时双边带中的无用边带。最后,介绍了基于AD9854和AD8346的直接正交上变频器优化设计的具体措施,并给出了实验结果。

The paper introduces the basic principles of direct digital synthesis（ DDS ） and direct quadrature up-conversion （DQUC）. The realization method of a broadband Doppler frequency simulator based on DDS and DQUC Techniques is proposed, which has all advantages of DDS and offers an economic approach to frequency up-conversion. At last, the paper introduces several practical measures for direct quadrature up-converter optimization based on AD9854 and AD8346, and the experiment results are presented.