【摘要】 介绍了数字上变频器AD985 7的性能指标 ,阐述了其在PD雷达导引头数字接收机中的应用 ,测试结果表明 ,经过精心设计 ,AD985 7可以作为数字接收机的可变频率源 ,在实际系统中应用。采用数字上变频器代替模拟接收机中的压控振荡器 ,可以提高输出频率的准确度、稳定度和频率控制的线性度 ,从而提高导引头的测量精度更多还原

【Abstract】 In this article. The specifications of Digital Upconverter AD9857 is introduced. And the application of AD9857 in digital receiver of PD Radar Seeker is discussed. Test results indicate that AD9857 can be applied as variable frequency source in the digital receiver. With the digital up converter replacing VCO of analog receiver, the precision and stability of the output frequency as well as the linearity of frequency controlling are improved. As a result, the measuring precision of the seeker is improved.更多还原