Pulse Phase Estimation of X-ray Pulsar with the Aid of Vehicle Orbital Dynamics
Pulse Phase Estimation of X-ray Pulsar with the Aid of Vehicle Orbital Dynamics
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DOI：
10.1017/s0373463315000727
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发表时间：
2015-10
影响因子：
2.4
通讯作者：
Yidi Wang;W. Zheng
中科院分区：
文献类型：
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作者：
Yidi Wang;W. Zheng
本文提出了一种利用飞行器轨道动力学估计X射线脉冲星脉冲相位的方法。将原连续时间X射线脉冲星信号模型修改为车辆位置和速度随时间变化的项，并给出了脉冲到达时间的修正定义。修正后的信号模型进一步围绕车辆的预测位置和速度线性化到二阶。扩展信号模型的初始相位和系数可以用极大似然估计器估计。仿真结果表明，该方法在飞行器初始状态范围内对初始误差具有较强的鲁棒性，能够处理低通量情况下的相位估计问题。
A pulse phase estimation of an X-ray pulsar with the aid of vehicle orbital dynamics is proposed. The original continue-time X-ray pulsar signal model is modified to be a term of vehicle position and velocity varying with time, and a modified definition of pulse time of arrival is given. The modified signal model is further linearized around the predicted position and velocity of the vehicle to the second order. The initial phase and the coefficients of the extended signal model can be estimated by maximum likelihood estimator. Some simulations are performed to verify the method and show the method has robustness to the initial error within initial state of the vehicle and is capable of handling the phase-estimation problem for pulsars with low fluxes.