相控阵天线适当随机馈相对DDS杂散的抑制

Reduction of Spur in DDS Based on Appropriate Random Phasing in Phased Arrays

将用于相控阵天线的随机馈相法,应用于DDS的设计。这种方法的优点是,采用这种随机馈相,在DDS中,频率偏差的均值为零,而且其杂散可得到抑制。当采用随机馈相的改进型,即适当随机馈相法时,DDS杂散的峰值进一步降低。文中,给出了计算结果,并对不同随机馈相方法的计算结果进行了比较。

The random phasing techniques for phased array antennas are applied to the design of DDS. The advantages of this technique are that with the random phasing,the mean deviation of the frequency is equal to zero and the spur is reduced in DDS. When the modified version of random phasing technique i. e.,the appropriate random phasing technique is used,the peaks of the spur in DDS can be further reduced. The computation results are presented and compared among different random phasing techniques.