CAJ | 학술논문

针对地面站的频率标准对航天器跟踪性能影响的问题,采用双向跟踪模式建立了多普勒测速跟踪系统模型.研究了频率标准的确定性和随机性起伏对无线电多普勒测量的影响.分析表明,时间统一系统的不准确和不稳定导致的频率标准不理想,是无线电跟踪测量的主要误差源,进一步推导了Allan方差、取样时间以及电波往返传输时间与地面站系统多普勒测速精度的关系.通过铷、铯、氢原子频率标准的仿真实验,验证了分析方法的有效性.
침대지면참적빈솔표준대항천기근종성능영향적문제,채용쌍향근종모식건립료다보륵측속근종계통모형.연구료빈솔표준적학정성화수궤성기복대무선전다보륵측량적영향.분석표명,시간통일계통적불준학화불은정도치적빈솔표준불이상,시무선전근종측량적주요오차원,진일보추도료Allan방차、취양시간이급전파왕반전수시간여지면참계통다보륵측속정도적관계.통과여、색、경원자빈솔표준적방진실험,험증료분석방법적유효성.
Aiming at the problem of effects for spacecraft's tracking performance due to ground station frequency standards, a Doppler velocity tracking model is established based on two-way tracking modes. The effects for Doppler tracking due to the determinative and random deviations of frequency standards are researched, and the analysis illustrates that frequency standards imperfections caused by inaccuracies and instabilities of timing are the primary error sources for radiometric tracking. The relations of Allan variance, averag-ing time and round trip light time are deduced. Finally, the effectiveness is demonstrated by simulations using Rubidium, Cesium and Hydrogen atom frequency standards.