X射线脉冲星时间模型和高质量轮廓提取研究-通信与信息系统专业论文.docxVIP

万方数据 万方数据 摘要 I 摘要 脉冲星是一种快速自转的中子星，其辐射信号周期稳定度极高，这一特性使 得能够利用脉冲星为航天器提供位置、速度和时间等丰富的导航信息。 在 X 射线脉冲星导航系统中，主要利用脉冲星的时间信息，时间模型的精度 直接决定了导航的精度。本文基于 RXTE 卫星实测数据，对导航中所使用的时间 转换和标准轮廓形成进行了研究。在时间转换理论基础上，重新推导了 2PN 下的 高精度时间转换公式，转换精度达 0.1 ns。通过实测数据计算时间转换中精度影响 因素，为实际导航提供了重要的数据支撑，同时得到了几种不同精度下的转换表。 此外，本文研究了脉冲星高质量轮廓的获取，分析了几种相位估计方法并根据实 测数据进行了对比，使用最大似然估计法对 382 个独立观测轮廓进行相位估计， 然后叠加，得到了 Crab、PSR B1509-58 等常用脉冲星的高质量轮廓。最后，针对 现有光子处理软件在功能和易用性上的不足，完成了一个新的光子处理软件功能 需求分析，并实现了时间处理以及轮廓生成等功能。 关键字：X 射线脉冲星信号 时间转换 标准轮廓 光子处理软件 Abstract II Abstract Pulsar is a rapidly spinning neutron star, one of its remarkable properties is high radi- ation signal stability, and this feature makes the pulsar provide position, velocity and time information for spacecraft. Spacecraft mainly uses pulsar timing information in the X -ray pulsar navigation sys- tem, so the timing model accuracy directly determines the navigation accuracy. This article uses the data from a USA satellite called RXTE, to study the time transform and standard profile of pulsars. Based on existing time transform theory, were-derived the high accuracy timing equation of pulsar navigation in 2PN approximation， the preci- sion can reach to 0.1 ns. Moreover, this article focuses on the study of some potential factors that could influence the accuracy, which would help in the real navigation sce- nario. In addition, we studied the acquisition of pulsar standard profile, several phase estimation method were compared based on the 382 set of data from RXTE, and ulti- mately uses the maximum likelihood estimation method to get the profile of Crab and PSR B1509-58 pulsar. Finally, because of some shortcomings such as functionality and ease of use in existing photon processing software, we redesign and implement a new photon processing software to help both in time transforming and profile acquisition. Keyword: X-ray pulsar signals Time transform standard profile photon processing software 目 录 III 目 录 摘要..........................................................