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| 1 | Pulse phase and doppler frequency estimation of X-ray pulsars under conditions of spacecraft and binary motion and its application in navigation显示文摘The pulse phase and doppler frequency estimation of X-ray pulsars in dynamic situations and its application in navigation is a problem that has not been fully investigated. In this paper, solutions are proposed to solve this problem under conditions of spacecraft and binary motion. A high-precision doppler frequency (velocity) measurement model as well as a phase (range) measurement model is established. The averaged maximum-likelihood estimator is developed for the dynamic pulse phase estimation. The pulse phase tracking technique is used in the doppler frequency determination. The tracking filter is redesigned and compared with the existing algorithms. The comparison verifies the advantage of the filter algorithm presented in this pa- per. Unlike traditional views, it is found that in dynamic situations, shorter observation interval lengths will result in higher-accuracy phase and frequency estimates as the tracking filter outputs. A photon-level integrated numerical simulation is performed. Simulation results testify to the validity of the proposed phase and doppler frequency estimation scheme, and show that incorporation of velocity measurements as well as the range ones into the navigation estimator will improve the navigation steady-state performance. | HUANG LiangWei LIANG Bin ZHANG Tao | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，4： | 11 |
| 2 | X-ray pulsar-based navigation using pulse phase and Doppler frequency measurements显示文摘In order to eliminate the impact of the Doppler effects caused by the motion of the spacecraft on the X-ray pulsar-based navigation, an innovative navigation method using the pulse phase and Doppler frequency measurements of the X-ray pulsars is proposed. Given the initial estimate of the spacecraft's state,the real-time photon arrival model is established at the spacecraft with respect to the spacecraft's position and velocity predicted by the orbit dynamic model and their estimation errors. On this basis, a maximum likelihood estimation algorithm directly using the observed photon event timestamps is developed to extract a single pair of pulse phase and Doppler frequency measurements caused by the spacecraft's state estimation error. Since the phase estimation error increases as the observation time increases, we propose a new measurement updating scheme of referring the measurements to the middle time of an observation interval. By using the ground-based simulation system of X-ray pulsar signals, a series of photon-level simulations are performed. The results testify to the feasibility and real-timeliness of the proposed navigation method, and show that the incorporation of the Doppler measurement as well as the pulse phase into the navigation filter can improve the navigation accuracy. | XUE MengFan LI XiaoPing FU LingZhong FANG HaiYan SUN HaiFeng SHEN LiRong | 2015 | Science China Chemistry2015，58，12： | 5 |
| 3 | 脉冲星方向误差及空间分布对相对导航的影响显示文摘X射线脉冲星导航是实现航天器长时间自主相对导航的有效手段之一.文中从X射线脉冲星相对导航卡尔曼滤波的观测方程出发,研究了脉冲星方向误差及空间分布对导航精度的影响,其中通过将方向误差转化为观测量误差对脉冲星方向误差进行建模,并推导了脉冲星组空间分布与导航精度的关系.卡尔曼滤波仿真结果表明:脉冲星方向误差在1 000acs以内时,滤波偏差随方向误差的增大而线性增大,1acs方向误差引入的距离偏差最大为0.34%;星组空间分布对导航精度的影响较大,从8颗星中任选4颗星进行导航时,距离估计精度相差达10.74%. | 薛梦凡 李小平 方海燕 孙海峰 沈利荣 | 2017 | 西安电子科技大学学报2017，44，1： | 1 |
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