本文選題：脈沖星 + 光子　； 參考：《光子學(xué)報(bào)》2017年05期

【摘要】：針對(duì)脈沖星信號(hào)周期估計(jì)需逐步搜索、計(jì)算量大等問(wèn)題,提出脈沖星信號(hào)周期直接估計(jì)算法.根據(jù)周期不確定誤差對(duì)時(shí)域上脈沖到達(dá)時(shí)間(Pulse Time of Arrival,TOA)估計(jì)方法的影響,推導(dǎo)了基于TOA信息的脈沖星信號(hào)周期估計(jì)方法的數(shù)學(xué)模型.該方法將一組觀測(cè)到的脈沖光子到達(dá)時(shí)間序列(Photon Time of Arrivals,TOAs)進(jìn)行等時(shí)間間隔分段,在時(shí)域上對(duì)每段TOAs進(jìn)行相位估計(jì)獲得相應(yīng)的TOA信息,并根據(jù)建立的TOA信息與周期誤差的關(guān)系采用最小二乘原理估計(jì)脈沖星信號(hào)周期.對(duì)周期準(zhǔn)確性的評(píng)價(jià)不同于傳統(tǒng)的依賴(lài)折疊輪廓的好壞,而是以TOA與時(shí)間圖像的斜率作為依據(jù),這一依據(jù)更直觀、易于理解.理論分析與物理、計(jì)算機(jī)仿真數(shù)據(jù)結(jié)果表明,本文所提的周期估計(jì)方法能夠根據(jù)短時(shí)間脈沖光子到達(dá)時(shí)間序列獲得高精度和高分辨率的脈沖信號(hào)周期,有利于X射線(xiàn)脈沖星導(dǎo)航的工程應(yīng)用.
[Abstract]:In order to solve the problem that the period estimation of pulsar signal needs to be searched step by step and the computation is large, a direct algorithm for estimating the period of pulsar signal is proposed. According to the effect of period uncertainty error on pulse Time of arrivalo estimation method in time domain, the mathematical model of period estimation method for pulsar signal based on TOA information is derived. In this method, a set of observed pulse photons Time of ArrivalsToas are segmented at equal intervals, and the corresponding TOA information is obtained by phase estimation of each segment of TOAs in time domain. According to the established relationship between TOA information and periodic error, the least square principle is used to estimate the period of pulsar signal. The evaluation of cycle accuracy is different from the traditional dependent folding profile, but based on the slope of TOA and time image, which is more intuitionistic and easy to understand. Theoretical analysis, physical and computer simulation results show that the period estimation method proposed in this paper can obtain high precision and high resolution pulse signal periods according to short time pulse photon arrival time series. It is beneficial to the engineering application of X-ray pulsar navigation.
【作者單位】： 哈爾濱工業(yè)大學(xué)衛(wèi)星技術(shù)研究所;
【基金】：The National High Technology Research and Development Program of China(No.2008AA8051602)
【分類(lèi)號(hào)】：TN911.23

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