CAJ | 학술논문

当电离层闪烁幅度衰落足够深 ,持续时间足够长时 ,用户接收机接收穿过电离层闪烁区域的卫星信号时其码和载波相位跟踪环路会失锁 ,导致这些卫星不可用,用户定位几何布局发生变化,进而影响定位性能.从GDO P退化、可用性、恶劣函数三个角度详细分析了电离层闪烁对BDS区域系统星座定位性能的影响.结果表明:存在电离层闪烁时 ,GDOP存在一定程度的退化 ,电离层闪烁中心点对应的地面位置GDO P退化程度最大,以此为中心向外辐射;可用性会下降 ,不过程度很小 ;恶劣函数值与电离层闪烁中心有关 ,且电离层闪烁中心越靠近目标点,影响越恶劣 ,当电离层闪烁中心远离目标点时 ,对定位影响几乎可以忽略.
당전리층섬삭폭도쇠락족구심 ,지속시간족구장시 ,용호접수궤접수천과전리층섬삭구역적위성신호시기마화재파상위근종배로회실쇄 ,도치저사위성불가용,용호정위궤하포국발생변화,진이영향정위성능.종GDO P퇴화、가용성、악렬함수삼개각도상세분석료전리층섬삭대BDS구역계통성좌정위성능적영향.결과표명:존재전리층섬삭시 ,GDOP존재일정정도적퇴화 ,전리층섬삭중심점대응적지면위치GDO P퇴화정도최대,이차위중심향외복사;가용성회하강 ,불과정도흔소 ;악렬함수치여전리층섬삭중심유관 ,차전리층섬삭중심월고근목표점,영향월악렬 ,당전리층섬삭중심원리목표점시 ,대정위영향궤호가이홀략.
When the decline of ionospheric scintiliation is deep enough and long enough , the signal will not exist .That will lead to some satellites unavailable and code tracking loop out of lock .For users ,the acailable satellite geormetry layout changes ,thereby affecting the positioning performance .I use BDS region measured data to analyse the influence of iono-spheric scintillation on positioning accuracy from GDOP degradation ,availability and poor function .The results show that the presence of ionospheric scintillation ,GDOP there is a cer-tain degree of degradation ,ionospheric scinitillation largest center ground position corre-sponding to the degree of degradation GDOP ,as the center outward radiation .Availablity will declin ,but to a small extent .Bad function calue and ionospheric scintillation center concerned and ionospheric scintillation closer to the center target point ,the more severe effects of iono-spheric scintillation center when away from the target point ,the positioning of the impact is almost negligible .