CAJ | 학술논문

全球导航卫星系统频域抗干扰接收机中，普遍采用数控振荡器生成本振信号。由于硬件约束，通常需要对数控振荡器进行相位截断。而数控振荡器相位截断是否合理对抗干扰性能影响较大。针对该问题，从数控振荡器相位截断导致的本振杂散着手，从理论上分析其对混频和频域抗干扰环节的影响。在此基础上，给出一种数控振荡器查找表地址位宽的理论计算模型，使得接收机的载噪比损耗接近无数控振荡器相位截断的频域抗干扰接收机。仿真结果表明，抑制带宽大于100kHz、干信比小于80dBc的窄带干扰时，计算的数控振荡器查找表地址位宽不超过10bit。与无数控振荡器相位截断的频域抗干扰接收机相比，采用数控振荡器混频的抗干扰接收机的载噪比损耗最多增加0．6dB。
전구도항위성계통빈역항간우접수궤중，보편채용수공진탕기생성본진신호。유우경건약속，통상수요대수공진탕기진행상위절단。이수공진탕기상위절단시부합리대항간우성능영향교대。침대해문제，종수공진탕기상위절단도치적본진잡산착수，종이론상분석기대혼빈화빈역항간우배절적영향。재차기출상，급출일충수공진탕기사조표지지위관적이론계산모형，사득접수궤적재조비손모접근무수공진탕기상위절단적빈역항간우접수궤。방진결과표명，억제대관대우100kHz、간신비소우80dBc적착대간우시，계산적수공진탕기사조표지지위관불초과10bit。여무수공진탕기상위절단적빈역항간우접수궤상비，채용수공진탕기혼빈적항간우접수궤적재조비손모최다증가0．6dB。
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.