【摘要】：脈沖星是高速自轉(zhuǎn)的中子星,有著極其穩(wěn)定的自轉(zhuǎn)周期,尤其是毫秒脈沖星,毫秒脈沖星周期的穩(wěn)定性之高,是自然界中可與量子頻標(biāo)相媲美的一種天然頻率源,是無須維護的天然的時鐘,是可望和地面原子時系統(tǒng)進行比對的頻率標(biāo)準(zhǔn)。毫秒脈沖星固有的內(nèi)部擾動很小,自轉(zhuǎn)十分穩(wěn)定,對毫秒脈沖星脈沖到達時間的測量成為一項重要的觀測研究,為建立獨立的脈沖星時間標(biāo)準(zhǔn)提供了可行性。 本文概述了脈沖星的基本屬性,探討了脈沖星計時觀測過程,重點研究了毫秒脈沖星時間尺度、脈沖星鐘和綜合脈沖星時,結(jié)果表明,毫秒脈沖星相對于普通脈沖星而言,更適合用于計時與導(dǎo)航應(yīng)用。利用俄羅斯普西諾射電天文臺關(guān)于脈沖星Geminga的低頻計時觀測資料,研究并分析其射電脈沖信號,并與以往結(jié)果比較和討論。簡要探討了脈沖星計時處理軟件Tempo2在殘差擬合前的去噪過程,以及殘差擬合和分析方法,通過模擬時間尺度經(jīng)Tempo2處理后的結(jié)果,分析研究該處理方法對建立標(biāo)準(zhǔn)脈沖星時間尺度的影響。研究了脈沖星鐘模型建立的方法,并利用最新的預(yù)報軟件Polyco對毫秒脈沖星J1857+0943進行了12h的脈沖到達相位和脈沖星自轉(zhuǎn)頻率預(yù)報,對其最新歷表的有效歷元起止時間兩端進行分區(qū)間段預(yù)報,討論了鐘模型預(yù)報的精度,驗證了毫秒脈沖星自轉(zhuǎn)頻率的漂移,并作出誤差分析。 利用澳大利亞國家望遠(yuǎn)鏡中心PARKES射電天文臺的四顆毫秒脈沖星約十年的計時觀測資料,首次使用大于2顆的脈沖星實測數(shù)據(jù)建立了綜合脈沖星時,評估了其穩(wěn)定度,并與相關(guān)原子時時間尺度進行比較分析,討論了改進綜合脈沖星時的多種因素,及綜合毫秒脈沖星時間尺度未來的應(yīng)用價值和意義。
[Abstract]:Pulsars are fast rotating neutron stars with extremely stable rotation periods, especially millisecond pulsars. The pulsars have a high stability and are a natural frequency source comparable to quantum frequency standards in nature. Is a maintenance-free natural clock, is expected to be compared with the ground atomic time system frequency standards. The intrinsic internal disturbance of millisecond pulsars is very small and the rotation is very stable. The measurement of the pulse arrival time of millisecond pulsars has become an important observation study, which provides a feasibility for the establishment of independent pulsar time standards. In this paper, the basic properties of pulsars are summarized, and the observation process of pulsars is discussed. The time scales of millisecond pulsars, pulsars clock and integrated pulsar time are mainly studied. The results show that millisecond pulsars are relative to ordinary pulsars. More suitable for timing and navigation applications. Based on the low-frequency timing data of the pulsar Geminga from the Puccino radio observatory in Russia, the radio pulse signals are studied and analyzed, and the results are compared and discussed. The de-noising process of pulsar timing software Tempo2 before residual error fitting, and the method of residual fitting and analysis are briefly discussed. The results of simulation time scale after Tempo2 processing are discussed. The effect of the processing method on the establishment of the standard pulsar time scale is analyzed and studied. The method of establishing pulsar clock model is studied, and the 12 h pulse arrival phase and pulsar rotation frequency of millisecond pulsar J1857 0943 are predicted by using the latest prediction software Polyco. The interval prediction of effective epoch beginning and ending time of its latest ephemeris is carried out. The precision of clock model prediction is discussed. The drift of rotation frequency of millisecond pulsar is verified and the error analysis is made. Based on the chronological observations of four millisecond pulsars from the Australian National Telescope Center (PARKES) Radio Observatory for about ten years, the stability of the pulsars is evaluated when the measured data of more than two pulsars are used for the first time to establish a comprehensive pulsar. Compared with the relative atomic time scale, the factors of improving the integrated pulsar time are discussed, and the application value and significance of the integrated millisecond pulsar time scale in the future are discussed.
【學(xué)位授予單位】：中國科學(xué)院研究生院（國家授時中心）
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：P145.6

【引證文獻】

相關(guān)碩士學(xué)位論文 前1條

1 楊樹啟;X射線脈沖星多波段觀測研究[D];中國科學(xué)院研究生院(國家授時中心);2012年

，

本文編號：2204358