【摘 要】
：
This paper addresses the problem of building the X-ray pulsar timing model that is an essential work for X-ray pulsar navigation(XNAV).We propose a theoretical discussion of the differences between th
【机 构】
：
School of Aerospace Science and Technology,Xidian University,Xi'an,710071,China
论文部分内容阅读
This paper addresses the problem of building the X-ray pulsar timing model that is an essential work for X-ray pulsar navigation(XNAV).We propose a theoretical discussion of the differences between the X-ray and radio pulsar timing and develop a complete processing framework.In this framework,the 2mZ-test method is deduced by the theory of the Fourier Series Estimator(FSE)in the complex form.A fast maximum likelihood(FAML)estimator is applied for the estimation of pulse time of arrival(TOA).Then the model parameters are deduced based on a least-squares strategy.To sustain this framework,about 173 ks observations with X-ray pulsar navigation-I(XPNAV-1)satellite over 30 days are utilized for experimental studies.The results show that the proposed framework is valid,and the phase residuals with the X-ray model parameters is 2.57 milliperiods.
其他文献
介绍了N-PERT电池和固态源共扩散简介现行硼磷扩散工艺与固态源共扩散的对比固态源扩散P+和N+层实验结果结论N-PERT电池简介结构简单,与P型结构类似.双面发电,单位面积发电量高.适用的N型硅片范围广.设备工艺与P型电池兼容性高.
Background CIGS:22.6 ％ZSW(2016.06)CdTe:22.1 ％First solar(2016.02)Properties of Sb2Se3 materials Structure:Consist of(Sb4Se6)nribbons
介绍了研究背景，可变化顶、侧功率比设计，可变化功率比和可移动隔热材料设计，总结研究背景可变化顶、侧功率比设计，前期功率比的确定，界面偏差为界面中心高度减去边部高度的值,正扰度表示界面为凸型(即界面凸向熔体);负扰度表示界面凹向熔体.
协鑫集成科技股份有限公司（002506.SZ）系全球领先的一站式综合能源服务解决方案提供商及服务商，公司将打造成为轻制造、重服务的系统集成和服务领域的龙头企业。.协鑫集成业务主要涉及系统设计优化、系统集成、金融服务及运维服务四大方面，为客户提供优化设计到产品选择，再到融资保险和运营维护的全方位定制化服务。铸锭多晶硅片表面有（111）/(112)/(212)等不同取向，单晶硅片，只有（100）晶面，
介绍了目前人们对非晶硅表面钝化本质的认识在半导体物理方面多限于钝化后硅片少子寿命的提高以及由此推算所得表面复合速率的大小,认为这还不能清晰解答钝化作用的本质,因为钝化薄膜的作用包括对悬挂键的减少以及表面固定电荷的变化等多种机制.
针对航天器内部多障碍物阻隔,复杂无线电干扰的定位环境,以及精确定位的需求,以Cricket技术为基础设计一套结构简洁、测量精度高、信息保密性好、以及抗干扰力强的超声波定位方案.本定位方案在航天器内部放置空间位置已知的参考点与空间位置未知的待定点构成参考平面,在参考平面的基础上建立相应的三维空间坐标系,驱动参考点同时向待定点发出红外和超声波定位信号,采取时间差(TDOA)算法测量待定点与参考点的相对
The trade-off among individual privacy,data utility and data feature of service has been a great concern when designing and evaluating privacy preserv-ing schemes in trajectories publishing.The trajec
作为定位与导航领域最具研究前途的方向之一,协同定位正在引起越来越多的关注,而用户间相互测距是协同定位得以实现的关键因素之一.本文研究了单边往返测距(SS-TWR)和双边往返测距(DS-TWR)的测量偏差,理论分析表明,在两用户相对静止或者处于低速相对运动状态时,由上述两种方法得出的测距偏差可以忽略不计,当两者存在高速相对运动时,由运动引入的偏差不能忽略,并且速度不同,两种方法得出的偏差亦不相同.基
With the development of national marine strategic plan,the demand of underwater high-precision positioning is increasing greatly.Acoustic wave,as an information carrier,plays an important role in unde
Geomagnetism-based attitude determination is a popular method for modern small/macro satellites for availability of small form factor,low power magnetometers and their accuracy in meeting the attitude