国防科技大学学报Issue(3)：28-33,6.DOI:10.11887/j.cn.201503005
数控振荡器相位截断对频域抗干扰性能影响分析
Numerically controlled oscillator phase truncation effect on performance of frequency domain anti-jamming
摘要
Abstract
Numerically controlled oscillator is usually adopted in current GNSS(Global Navigation Satellite System)frequency domain anti-jamming receiver.Constrained by hardware,numerically controlled oscillator phase truncation is needed.But,whether numerically controlled oscillator phase is truncated reasonably influences anti-jamming performance greatly.Aiming at the problem,its effect on mixing and frequency domain anti-jamming was analyzed theoretically based on local oscillator spur caused by numerically controlled oscillator phase truncation.A theoretical computing module of numerically controlled oscillator look-up table width was brought forward.Thus,carrier noise loss approximated that of receiver with non-truncated phase numerically controlled oscillator.Simulations show that numerically controlled oscillator look-up table width computed by that module is no more than 10bit,when suppressing narrow band interference whose band is above 100kHz and jam-signal-ratio is below 80dBc.When adopting that width,carrier noise loss of receiver with numerically controlled oscillator phase truncation increases 0.6dB at most,compared to that of receiver with non-truncated numerically controlled oscillator phase.关键词
全球导航卫星系统接收机/相位截断/频域抗干扰/载噪比损耗Key words
GNSS receiver/phase truncation/frequency anti-jamming/carrier noise loss分类
信息技术与安全科学引用本文复制引用
李建,聂俊伟,李柏渝,王飞雪..数控振荡器相位截断对频域抗干扰性能影响分析[J].国防科技大学学报,2015,(3):28-33,6.基金项目
青年科学基金资助项目 （）
