CAJ | 학술논문

分析了在卫星双向时间频率传递中，由地面站间钟差和卫星运动引起的双向几何路径不对等导致的双向几何路径时延差对双向时间比对计算结果的影响。选取了3颗卫星（中卫1号、北斗3G、IGSO70）和3组地面站（北京-成都、北京-喀什、北京-三亚）组成的9条卫星双向时间频率传递链路作仿真计算。对于这9条链路，仿真结果显示：1）当两地面站间钟差在1μs～10 ms范围内时，通过GEO卫星比通过IGSO卫星的双向不对等几何路径时延之差对双向时间比对计算结果的影响（τ值）较小；2）假设地面站间钟差在1 ms内时，通过 GEO卫星的卫星双向时间比对链路所对应的τ值均在皮秒量级，一般可忽略；通过 IGSO 卫星的卫星双向时间比对链路所对应的τ值均在纳秒量级，一般不可忽略。
분석료재위성쌍향시간빈솔전체중，유지면참간종차화위성운동인기적쌍향궤하로경불대등도치적쌍향궤하로경시연차대쌍향시간비대계산결과적영향。선취료3과위성（중위1호、북두3G、IGSO70）화3조지면참（북경-성도、북경-객십、북경-삼아）조성적9조위성쌍향시간빈솔전체련로작방진계산。대우저9조련로，방진결과현시：1）당량지면참간종차재1μs～10 ms범위내시，통과GEO위성비통과IGSO위성적쌍향불대등궤하로경시연지차대쌍향시간비대계산결과적영향（τ치）교소；2）가설지면참간종차재1 ms내시，통과 GEO위성적위성쌍향시간비대련로소대응적τ치균재피초량급，일반가홀략；통과 IGSO 위성적위성쌍향시간비대련로소대응적τ치균재납초량급，일반불가홀략。
The effect of the difference of the time delay, which results from the two-way nonreciprocal geometric path due to the clock offset between the two stations and the satellite motion, on the results of TWSTFT (two-way satellite time frequency transfer) is analyzed. A simulation is conducted for 9 links of TWSTFT, which relate to 3 satellites(chsat-1, BD-3G, IGSO70) and 3 pairs of station(Beijing-Chengdu, Beijing-Kashi, Beijing-Sanya). The simulation shows:1)when the clock offset between the two stations is between 1 ms and 10 ms, the effect of two-way nonreciprocal geometric path via GEO satellite on the result of TWSTFT, i.e.τvalue, is less than that via IGSO satellite;2)when the clock offset between the two stations is less than 1 ms, the effect of two-way nonreciprocal geometric path via GEO satellite on the result of TWSTFT, i.e.τvalue, is in the order of picosecond and can be ignored, while that for the path via IGSO satellite is in the order of nanosecond and final to be ignored.