利用X射线脉冲星的星间差分联合定位方法  

Differential co-localization method using the X-ray pulsar

作　　者：丰大军[1] 许录平[1] 宋诗斌 田茜[1] 

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071

出　　处：《西安电子科技大学学报》2014年第1期81-86,共6页Journal of Xidian University

基　　金：国家自然科学基金资助项目(61172138);中国科学院精密导航定位与定时技术重点实验室开放基金资助项目(2012PNTT02)

摘　　要：提出了一种基于X射线脉冲星的空间联合相对定位模式,主星接收脉冲星辐射脉冲信号,将到达时间、个别脉冲特征经星间链路向邻近卫星转发,经过测量脉冲星信号星间的传播时差,建立定位方程来解星间相对位置.推导了脉冲到达时间预测模型的误差修正公式,分析了脉冲星个别脉冲的可辨识性.所提方法兼有脉冲星自主导航、精确定时的特点,受脉冲星相位预测模型误差的影响较小,有助于实现到达时间预测模型的在线自适应修正,也有助于实现卫星星座的联合定轨.Relative navigation traditionally using inter-satellite links demands higher inter-satellite time synchronization, and has no ability of absolute positioning and timing. In this paper, we propose a relative navigation model of X-ray pulsar-based co-localization. The main satellite receives the radiation pulse signal from X-ray pulsars, and sends the arrival time and individual pulse＇s feature to adjacent satellites through inter-satellite links. Then by detecting the inter-satellite time difference of X-ray pulsar signals we can establish the location equation to find the inter-satellite relative position. We deduce the error correction equation of the pulse TOA prediction model and analyze the identifiability of individual pulses of the pulsar. The method proposed in this paper is less influenced by the TOA prediction model, ephemeris error, etc. It is helpful for achieving on-line self-adaption correction of the TOA prediction model and combined orbit determination of satellite constellation.

关 键 词：导航 脉冲星 联合定位 到达时间 卫星星座 

分 类 号：P128.4[天文地球—天体测量]