脉冲星计时数据的天体测量解析

已有的研究表明，通过对毫秒脉冲星脉冲到达观测者的时刻（time of arrival，TOA）的记录和分析，实现航天器的自主定位是可行的。我们对TOA所含成分作了解析，导出和解释了TOA与观测者质心位置间关系的基本方程，并与其他一些作者的结果进行比较和讨论。作者认为，TOA和太阳系质心（SSB）处的脉冲到达时刻无关，和SSB的日心坐标无关，也和SSB处的引力时延无关。因此，不应如Sheikh所做的那样，试图在观测者和SSB之间计算较差到达时刻和较差引力时延。

An astrometry parsing to the data of pulsar timing

Some available studies have indicated that it is feasible for a spacecraft to self-position based on the data of Time Of Arrival （TOA） of pulses from millisecond pulsars. In this paper, the components included in TOA are parsed, and the essential expression relating to the TOA and the barycentral position of the spacecraft is educed and compared with those of other authors. We conclude that observed TOA are irrelative to the pulses arrival time at Solar System Barycentre （SSB）, to the heliocentric position of SSB, and to the gravitational delay at SSB. Therefore, it is not supposed to calculate the differential TOA as well as differential gravitational delay between the observer and SSB, like as that given by Sheikh.