宇航计测技术
宇航計測技術
우항계측기술
JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT
2009年
6期
49-53
,共5页
地心惯性系%钟差%时间同步%地球同步卫星%时间比对
地心慣性繫%鐘差%時間同步%地毬同步衛星%時間比對
지심관성계%종차%시간동보%지구동보위성%시간비대
Earth-centered inertial reference frame (ECI)%Clock difference%Time synchronization%Geostationary satellite%Time comparison
卫星导航定位系统测距的基础是测时,而定轨和定位的前提是各观测量的时间同步.因此,时间同步技术是卫星导航定位系统建设的关键技术基础之一.根据星地无线电双向法时间同步技术的基本原理,详细推导了其在地心惯性系中的基本计算模型,并以静止地球同步轨道卫星为例,分析了该计算模型中的距离改正项时延对星地间相对钟差的影响量级.
衛星導航定位繫統測距的基礎是測時,而定軌和定位的前提是各觀測量的時間同步.因此,時間同步技術是衛星導航定位繫統建設的關鍵技術基礎之一.根據星地無線電雙嚮法時間同步技術的基本原理,詳細推導瞭其在地心慣性繫中的基本計算模型,併以靜止地毬同步軌道衛星為例,分析瞭該計算模型中的距離改正項時延對星地間相對鐘差的影響量級.
위성도항정위계통측거적기출시측시,이정궤화정위적전제시각관측량적시간동보.인차,시간동보기술시위성도항정위계통건설적관건기술기출지일.근거성지무선전쌍향법시간동보기술적기본원리,상세추도료기재지심관성계중적기본계산모형,병이정지지구동보궤도위성위례,분석료해계산모형중적거리개정항시연대성지간상대종차적영향량급.
The basis of range measurement in the satellite navigation and positioning system is time measurement, and the precondition of orbiting and positioning is time synchronization of all the observations.Therefore, time synchronization is one of the pivotal technologies in satellite navigation and positioning system. According to the principle of the method of two-way satellite and ground time comparison by wireless radio, the computational model of the method of two-way satellite and ground time comparison by wireless radio in the ECI has been deduced. Taking the geostationary satellite for example, the quantity level of the influence of every item in the distance correction time delay of the computational model to the relative satellite-ground time difference has been analyzed.
