CAJ | 학술논문

针对卫星信号的捕获方法、多普勒频移、码片同步误差和预检测积分时间等因素对卫星信号检测概率的影响，本文依据卫星信号的相关特性和卫星信号捕获原理，分析了预检测积分时间和多普勒频率误差与信号幅度关系，对北斗系统 GEO 卫星，通过仿真给出了载体运动与载波多普勒频移的关系，并分析了多普勒频移对捕获性能的影响。仿真结果表明，载噪比较低时高速运动载体捕获概率会降低，但若能得到外部多普勒频率辅助，可降低捕获的载噪比门限。因此，应用于飞机等高速运动载体的北斗用户接收机应采用多普勒频率辅助方式以提高捕获性能。该研究对北斗系统在高速运动载体上的应用具有重要意义。
침대위성신호적포획방법、다보륵빈이、마편동보오차화예검측적분시간등인소대위성신호검측개솔적영향，본문의거위성신호적상관특성화위성신호포획원리，분석료예검측적분시간화다보륵빈솔오차여신호폭도관계，대북두계통 GEO 위성，통과방진급출료재체운동여재파다보륵빈이적관계，병분석료다보륵빈이대포획성능적영향。방진결과표명，재조비교저시고속운동재체포획개솔회강저，단약능득도외부다보륵빈솔보조，가강저포획적재조비문한。인차，응용우비궤등고속운동재체적북두용호접수궤응채용다보륵빈솔보조방식이제고포획성능。해연구대북두계통재고속운동재체상적응용구유중요의의。
Acquisition of satellite signals by the receiver of BDS users are the premise and key issue to real-ize navigation.The satellite signal detection probability is related to the capture method,the Doppler fre-quency,the chip error and the pre-detection integration time.Based on characteristics of the satellite sig-nal and its capture principle,this paper analyzes the relationship between the pre-detection integration time,the Doppler frequency and the signal amplitude.For the BDS GEO satellite,the relationship be-tween the carrier tendency and the carrier Doppler frequency is presented with simulation.It also analyzes the effect of Doppler frequency on acquisition performance.The result indicates that the acquisition proba-bility for high-speed moving carrier will be lower when the carrier-to-noise ratio is low.However,if it is assisted by exterior Doppler frequency,the carrier-to-noise ratio threshold will be lowered.There-fore,the BDS receiver used in aircraft and other high speed carrier should be adopted for the Doppler fre-quency auxiliary style to improve the acquisition performance.