基于X射线脉冲星的空间定位误差仿真研究

研究了X射线脉冲星脉冲到达时间(TOA)测量的原理;基于TOA测量,构建了SSB惯性系下空间绝对定位的数学模型,并说明了整周期数向量的求解过程;基于SNR得出了脉冲相位观测时间与TOA测量精度的关系.利用仿真脉冲相位观测数据,对×射线脉冲星空间定位进行系统仿真.仿真结果表明模糊度搜索效果较好,相位观测时间的选择对位置确定的精度影响较大.

Simulation of Errors in the Absolute Position Determination in Space Based on X-ray Pulsars

The principle of the TOA(time of arrival) measurement for the X-ray pulsars was studied.Based on the TOA measurement, the model of absolute position determination in the space in SSB was established, and how to obtain the integer cycles vector was explained.The relationship between the pulse phase observation time and the TOA accuracy was shown based on the SNR.Using the simulated pulse phase data, the system of position determination in the space based on the X-ray pulsars was simulated.The result shown that there was a better resolution for searching the cycle ambiguity, and the phase observation time was important to the position determination accuracy.