全球定位系统
全毬定位繫統
전구정위계통
GPS WORLD OF CHINA
2015年
2期
67-71,80
,共6页
电离层%相关性%增强系统设计%电离层闪烁
電離層%相關性%增彊繫統設計%電離層閃爍
전리층%상관성%증강계통설계%전리층섬삭
Ionosphere%correlation structure%system development%ionospheric scintil-lation
卫星导航局域增强系统采用差分技术实现高精度定位能力。电离层扰动现象将对局域增强系统产生严重影响。电离层暴降低了电离层延迟空间相关性，进而影响差分定位的精度；电离层闪烁引起卫星信号质量和测量质量的降低，同时伴随闪烁产生的电离层电子密度不均匀体也会降低电离层延迟的空间相关性，影响差分定位精度。电离层扰动对局域增强系统的影响应通过接收机设计、增强系统设计、完好性实现方法等多方面的改进加以应对。
衛星導航跼域增彊繫統採用差分技術實現高精度定位能力。電離層擾動現象將對跼域增彊繫統產生嚴重影響。電離層暴降低瞭電離層延遲空間相關性，進而影響差分定位的精度；電離層閃爍引起衛星信號質量和測量質量的降低，同時伴隨閃爍產生的電離層電子密度不均勻體也會降低電離層延遲的空間相關性，影響差分定位精度。電離層擾動對跼域增彊繫統的影響應通過接收機設計、增彊繫統設計、完好性實現方法等多方麵的改進加以應對。
위성도항국역증강계통채용차분기술실현고정도정위능력。전리층우동현상장대국역증강계통산생엄중영향。전리층폭강저료전리층연지공간상관성，진이영향차분정위적정도；전리층섬삭인기위성신호질량화측량질량적강저，동시반수섬삭산생적전리층전자밀도불균균체야회강저전리층연지적공간상관성，영향차분정위정도。전리층우동대국역증강계통적영향응통과접수궤설계、증강계통설계、완호성실현방법등다방면적개진가이응대。
Differenctial correction method is adopted in GNSS Local Area Augmentation System (LAAS) to improve accuracy .Various ionospheric disturbances with different phe‐nomenon could seriously degrade the performance of LAAS .For ionospheric storm ,the deg‐radation will be caused by the loss of ionospheric delay spatial correlation produced by large delay gradients . For ionospheric scintillation , the effects will be results of two different mechanisms ,one is the degradation of signal quality and measurements quality caused by scintillation ,the other is the loss of ionospheric delay spatial correlation caused by irregulari‐ties in electron density .Measures from various aspects such as receiver design ,system de‐velopment ,and method of integrity realization should be taken to avoid the effects of iono‐spheric disturbance .
