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X射线脉冲星具有广阔的导航应用前景,稳定的脉冲轮廓是自主导航的基础,然而在X射线脉冲轮廓的稳定性及其对导航精度的影响方面一直缺乏系统的研究.采用Pearson相关系数、标准偏差及功率谱熵三组指标量化脉冲轮廓的稳定性.利用罗西X射线计时探测器卫星X射线段(2—16 keV)11年的观测资料,统计了包括周期跃变在内的Crab脉冲轮廓稳定性.在此基础上,引入Cramer-Rao理论建立了脉冲轮廓稳定性对距离测量误差影响的数学模型,并通过分析各误差因素确定脉冲轮廓稳定性对距离测量误差的影响范围.实测数据处理表明,Crab脉冲星的X射线脉冲轮廓具有极高的稳定性,跃变期间脉冲轮廓无明显变化,脉冲轮廓的稳定性导致沿脉冲星方向上产生34 m±25 m的距离测量误差.
However, the stability of X-ray pulse profile and its impact on navigation accuracy have not been studied systematically.Using the Pearson correlation coefficient, the standard Deviation and power spectral entropy of three sets of indicators to quantify the stability of the pulse profile.The use of Rossi X-ray time-lapse satellite satellite X-ray section (2-16 keV) 11 years of observation data, statistics, including periodic transition Crab pulse On the basis of this, Cramer-Rao theory is introduced to establish the mathematical model of the influence of pulse profile stability on distance measurement error, and the influence range of pulse profile stability on distance measurement error is determined by analyzing the error factors. The results show that the X-ray pulse profile of Crab pulsar has high stability and the pulse profile does not change obviously during the transition. The stability of the pulse profile leads to a distance measuring error of 34 m ± 25 m along the pulsar direction.