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  本文關(guān)鍵詞：利用高頻GPS單站數(shù)據(jù)解算同震地表位移關(guān)鍵算法研究　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高頻GPS數(shù)據(jù) 單站星間單差時間基線模型 衛(wèi)星鐘差 分段線性插值 周跳 探測與修復(fù) 同震地表位移

【摘要】：隨著高頻GPS(Global Positioning System)接收機(jī)的逐漸普及,以及采用高頻GPS技術(shù)可直接獲取測站位移形變等優(yōu)勢,使得高頻GPS技術(shù)在地震學(xué)領(lǐng)域有了廣闊的發(fā)展空間。本文根據(jù)地震發(fā)生時間很短暫,而短時間內(nèi)對流層延遲等誤差強(qiáng)相關(guān)性和沒有周跳時模糊度固定不變的特點,通過采用單站時間基線模型獲得地震期間測站瞬時地表位移。本文以時間基線模型和GPS單站星間單差消電離層模型為基礎(chǔ),得到單站星間單差時間基線觀測模型,并對其隨機(jī)模型進(jìn)行了推導(dǎo)分析�；趩握拘情g單差時間基線觀測模型,得出影響模型解算精度的主要是衛(wèi)星鐘差和周跳這兩個因素。為進(jìn)行衛(wèi)星鐘差改正,對分段線性插值方法、滑動拉格朗日插值方法和三次樣條插值方法進(jìn)行了分析,通過實驗比較了三種插值方法的插值效果,實驗表明:分段線性插值方法的精度最高。本文對電離層殘差法及Wubbena-Melbourne組合法這兩種常用的周跳探測與修復(fù)方法進(jìn)行簡要分析,通過實驗驗證了兩種方法的探測效果及局限性;基于巴爾達(dá)數(shù)據(jù)探測法和 LAMBDA(Least-square Ambiguity Decorrelation Adjustment Method)方法,本文提出了基于狀態(tài)估計的序貫最小二乘周跳探測與修復(fù)方法,并對該方法的各種影響因素進(jìn)行了研究與分析。采用1Hz靜態(tài)數(shù)據(jù)和1Hz地震數(shù)據(jù)進(jìn)行周跳模擬實驗,實驗結(jié)果表明:該方法可以成功的探測與修復(fù)靜態(tài)數(shù)據(jù)和地震數(shù)據(jù)中1周的小周跳。完成衛(wèi)星鐘差改正和周跳探測與修復(fù)后,本文采用5Hz的高頻靜態(tài)數(shù)據(jù)、EI-Mayor-Cucapah地震期間1Hz高頻數(shù)據(jù)、蘆山地震期間50Hz高頻數(shù)據(jù)進(jìn)行解算。實驗結(jié)果表明:對于靜態(tài)數(shù)據(jù),采用本文方法解算得到的N、E、U三個方向的均方根誤差分別為3.1mm,3.3mm,8.5mm,且位移結(jié)果分布圖呈現(xiàn)正態(tài)分布的特性;對于采用本文方法所得EI Mayor-Cucapah地震期間的解算結(jié)果,相對于SOPAC(Scripps Orbit and Permanent Array Center)的雙差解,本文方法不受地震期間參考站位移的影響,所得動態(tài)位移結(jié)果精度更高、更準(zhǔn)確;蘆山地震期間的GPS數(shù)據(jù)解算測站最大振幅結(jié)果與前人的研究成果相差僅為2mm。三個實驗的結(jié)果進(jìn)一步驗證了本文單站星間單差時間基線模型的正確性和可靠性。
[Abstract]:With the increasing popularity of high frequency GPS(Global Positioning system receivers, and the advantages of using high frequency GPS technology to obtain the displacement deformation of measuring stations directly. The high frequency GPS technology has a broad development space in the field of seismology. According to the earthquake occurrence time is very short. In a short period of time, the tropospheric delay has strong correlation and the ambiguity is invariant when there is no cycle slip. The instantaneous surface displacement of the station during the earthquake is obtained by using the single station time baseline model. This paper is based on the time baseline model and the single difference ionospheric model of GPS single station. The single difference time baseline observation model is obtained, and the stochastic model is deduced and analyzed. The model is based on the single difference time baseline observation model. In order to correct the satellite clock error, the piecewise linear interpolation method is obtained. The sliding Lagrange interpolation method and the cubic spline interpolation method are analyzed, and the interpolation effects of the three interpolation methods are compared by experiments. The experiment shows that:. The precision of piecewise linear interpolation is the highest. In this paper, two commonly used cycle slip detection and repair methods, the ionospheric residual method and the Wubbena-Melbourne combination method, are briefly analyzed. The effectiveness and limitation of the two methods are verified by experiments. Based on Valda data detection and Lambda (. The Least-square Ambiguity Decorrelation Adjustment method. In this paper, a sequential least square cycle slip detection and restoration method based on state estimation is proposed. The influence factors of this method are studied and analyzed. The cycle slip simulation experiment is carried out by using 1Hz static data and 1Hz seismic data. The experimental results show that this method can successfully detect and repair the small cycle slip in the static data and seismic data. After the satellite clock error correction and cycle slip detection and repair are completed, the high frequency static data of 5 Hz are used in this paper. 1 Hz high frequency data during EI-Mayor-Cucapah earthquake and 50 Hz high frequency data during Lushan earthquake are calculated. The experimental results show that: for static data. The root mean square error of the three directions is 3.1 mm / 3.3mm / 8.5mm, respectively, and the distribution of the displacement results shows the characteristics of normal distribution. The calculated results of ei Mayor-Cucapah earthquake are obtained by using this method. Compared with SOPAC(Scripps Orbit and Permanent Array center. The method in this paper is not affected by the displacement of reference station during earthquake, and the result of dynamic displacement is more accurate and accurate. The difference between the maximum amplitude of the GPS data and the previous research results is only 2 mm. The results of three experiments further verify the correctness of the single difference time baseline model between single station and satellite in this paper. Reliability.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P228.4;P315.7

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