發(fā)布時間：2018-05-06 16:33

  本文選題：多頻衛(wèi)星導航系統(tǒng) + 電離層延遲消除��； 參考：《國防科學技術大學》2014年博士論文

【摘要】：衛(wèi)星導航系統(tǒng)的高精度測量數(shù)據(jù)處理是進行精密定位、精密定軌和時頻同步的基礎。隨著衛(wèi)星導航系統(tǒng)向三頻、四頻系統(tǒng)發(fā)展,用戶可以獲得更多的冗余觀測量,需要優(yōu)化多頻測量數(shù)據(jù)的處理方法,從而實現(xiàn)更快的初始化時間和更高的解算精度。北斗全球衛(wèi)星導航系統(tǒng)未來擬播發(fā)包含S頻段在內的4個頻點導航信號,本文針對四頻偽距、載波相位和多普勒測量數(shù)據(jù)的高精度處理需求,研究了多頻偽距消除電離層延遲技術、多頻載波相位平滑偽距技術、長基線下多頻載波相位模糊度快速解算技術和基于載波多普勒的遠程時頻同步和評估技術,取得了以下創(chuàng)新性成果:1.針對多頻偽距電離層延遲消除導致的偽距噪聲放大問題,推導了多頻偽距消除電離層延遲的通用算法,分析了北斗全球系統(tǒng)中基于組合噪聲方差最小準則的雙頻、三頻、四頻用戶的電離層延遲消除算法,為北斗全球系統(tǒng)的導航信號設計提供理論支撐。理論分析和試驗結果表明,播發(fā)S頻段導航信號的北斗全球系統(tǒng)比北斗區(qū)域系統(tǒng)在無電離層偽距精度和定位精度上,都能提高5~8倍。同樣播發(fā)4頻導航信號且同等噪聲水平下,北斗全球系統(tǒng)的無電離層組合偽距的精度是Galileo系統(tǒng)的1~4倍。2.針對四頻導航信號帶來的新機遇,研究了多頻GNSS系統(tǒng)的載波相位平滑偽距技術,推導了通用的算法模型,提出了基于隨機誤差方差最小準則的四頻一階偽距平滑優(yōu)化算法。理論分析和試驗結果表明,北斗全球系統(tǒng)載波相位平滑偽距能夠將偽距隨機誤差降低至毫米級,比北斗區(qū)域系統(tǒng)精度提高2~3倍,并使得定位精度提高5~8倍。3.針對傳統(tǒng)層疊式整數(shù)解算法(CIR)在長基線場景中無法單歷元求解模糊度的問題,提出了利用組合載波模糊度轉換求解基礎載波模糊度的單歷元解算算法。該算法以長波長、總誤差較小和轉換矩陣條件數(shù)最小為優(yōu)化準則,并利用平滑后的雙頻偽距和已確定模糊度的組合載波相位來消除電離層延遲,提高組合載波模糊度解算精度和基礎載波模糊度單歷元解算成功率。該算法將適用基線長度從幾十km提升至1000km以上,且在1000km的長基線下,該算法將單歷元解算模糊度的成功率從傳統(tǒng)CIR法的7%提升至100%。4.針對導航系統(tǒng)長基線地面站的時間頻率同步和頻率穩(wěn)定度評估問題,提出一種基于雙向衛(wèi)星頻率比對和三角帽法的遠程頻率穩(wěn)定度評估算法。該算法利用載波多普勒測量數(shù)據(jù)計算站間頻差,克服了基于偽距的雙向衛(wèi)星時間頻率傳遞算法在短穩(wěn)評估上精度差的缺點,通過三站之間兩兩的頻率比對,實現(xiàn)單站的頻率穩(wěn)定度評估。利用該算法處理北斗系統(tǒng)實測數(shù)據(jù)的結果表明,解算的秒穩(wěn)達到10-13量級,萬秒穩(wěn)達到10-15量級。論文的研究成果中關于三頻測量數(shù)據(jù)的處理算法和遠程頻率穩(wěn)定度評估算法,已經(jīng)應用到北斗區(qū)域系統(tǒng)地面運控系統(tǒng)的主控站測量與通信系統(tǒng)和時間同步/注入站等多個項目,在精密定位、精密定軌和高精度頻率比對等技術領域,支撐項目的總體方案論證和設備研制工作。關于四頻測量數(shù)據(jù)的處理算法可應用于北斗全球系統(tǒng)的研制,對于GPS、Galileo等其他衛(wèi)星導航系統(tǒng)也有重要借鑒價值。
[Abstract]:The high precision measurement data processing of the satellite navigation system is the basis of precision positioning, precision orbit determination and time frequency synchronization. With the development of the satellite navigation system to the three frequency and four frequency systems, the user can obtain more redundancy measurements. It is necessary to optimize the processing method of multi frequency measurement data so as to achieve faster initialization time and higher level. In the future, the global satellite navigation system of Beidou will broadcast 4 frequency point navigation signals including the S frequency band. In this paper, the multi frequency pseudo distance elimination ionospheric delay technology, the multi frequency carrier wave phase smoothing pseudo distance technology and the multi frequency carrier under the long baseline are studied for the high precision processing demand of the four frequency pseudo distance, the carrier phase and the Doppler measurement data. The fast phase ambiguity resolution technique and the remote time frequency synchronization and evaluation technology based on carrier Doppler have obtained the following innovative results: 1. for the pseudo range noise amplification problem caused by the multi frequency pseudo distance ionospheric delay elimination, the multifrequency pseudo distance to eliminate the ionospheric delay is derived, and the group based on the group in the Beidou global system is analyzed. The double frequency, three frequency, four frequency user's ionospheric delay elimination algorithm, which is combined with the minimum noise variance criterion, provides theoretical support for the navigation signal design of the Beidou global system. The theoretical analysis and experimental results show that the Beidou global system that broadcasts the S band navigation signal is more accurate and accurate than the Beidou region system in the absence of ionospheric pseudo range accuracy and positioning accuracy. It can improve the 5~8 times. As well as the 4 frequency navigation signal and the same noise level, the accuracy of the non ionospheric combination pseudorange in the Beidou global system is the new opportunity brought by the 1~4 times of the Galileo system for the four frequency navigation signal. The carrier phase smooth pseudo distance technique of the multi frequency GNSS system is studied, and the general algorithm model is derived, and the base of the algorithm is proposed. The four frequency first order pseudo distance smoothing optimization algorithm of the random error variance minimum criterion. The theoretical analysis and experimental results show that the carrier phase smooth pseudo range of the Beidou global system can reduce the pseudo range random error to the millimeter level, 2~3 times higher than the Beidou regional system precision, and make the positioning accuracy increase by 5~8 times.3. for the traditional stacked integer solution. The algorithm (CIR) can not solve the ambiguity in a long baseline scene, and a single epoch algorithm is proposed to solve the basic carrier ambiguity by using the combined carrier ambiguity conversion. The algorithm takes the long wavelength, the total error is smaller and the conversion matrix condition minimum is the optimal criterion, and uses the smoothed dual frequency pseudo distance and the established model. The combined carrier phase of the paste is used to eliminate the ionospheric delay, improve the accuracy of the combined carrier ambiguity resolution and the success rate of the basic carrier ambiguity resolution. This algorithm improves the length of the baseline from dozens of km to more than 1000km, and under the long baseline of 1000km, the algorithm makes the success rate of solving the ambiguity from the traditional CIR method 7%. To 100%.4., a remote frequency stability evaluation algorithm based on two-way satellite frequency comparison and triangle cap method is proposed to evaluate the time frequency synchronization and frequency stability of the long baseline ground station of the navigation system. The algorithm uses the carrier Doppler measurement data to calculate the inter station frequency difference and overcomes the pseudo distance based two-way satellite. Between the three stations, the frequency stability of a single station is evaluated by the frequency ratio of 22 between the stations. The results of the calculation of the measured data of the Beidou system show that the calculated second stability reaches 10-13, and the second is 10-15. The data processing algorithm and the remote frequency stability evaluation algorithm have been applied to the main control station measurement and communication system and the time synchronization / injection station of the Beidou regional system ground transportation control system, such as the precision positioning, precision orbit determination and high precision frequency ratio equivalence domain, supporting the overall scheme demonstration and equipment development of the project. Work. The processing algorithm of four frequency measurement data can be applied to the development of the Beidou global system. It also has important reference value for other satellite navigation systems such as GPS, Galileo and so on.

【學位授予單位】：國防科學技術大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN967.1

【參考文獻】

相關期刊論文 前3條

1 王曉明;殷耀國;楊自明;;全球導航衛(wèi)星系統(tǒng)的現(xiàn)代化進展[J];全球定位系統(tǒng);2006年04期

2 秦顯平,楊元喜,焦文海,王剛;利用SLR和偽距資料確定導航衛(wèi)星鐘差[J];測繪學報;2004年03期

3 喻國榮,劉經(jīng)南;一個模糊度解算的新概念[J];長江科學院院報;2003年05期

，

本文編號：1853041