三頻數(shù)據(jù)組合在周跳探測與修復中的應用
發(fā)布時間：2018-07-18 09:22
【摘要】：現(xiàn)代化后的美國GPS，俄羅斯的GLONASS、中國的COMPASS以及歐洲的Galileo等全球衛(wèi)星導航系統(tǒng)均設計采用多個頻率，多頻信號可以形成更多具有優(yōu)良特性的數(shù)據(jù)組合，為載波相位的周跳探測提供了更多選擇。本文在單頻和雙頻周跳探測與修復方法研究的基礎之上，基于三頻數(shù)據(jù)能形成長波長、消電離層/弱電離層、低噪聲等優(yōu)良特性的組合，對GNSS現(xiàn)代化后的三頻周跳探測與修復提出了兩種新的方法：選取兩組相位無幾何距離組合(-1,-1,2)和(-1,4,-3),在200周內(nèi)可以探測出除敏感周跳外的所有周跳，但探測出的組合周跳值不能固定為整數(shù)，也無法進行基礎載波上的周跳值分離，用一個三階多項式擬合L1、L2和L5的頻間單差值，這四組方程按照間接平差原理，可以探測出各個頻率上大于或等于1周的周跳，這種方法適用于高采樣率下的周跳探測；基于相位減偽距組合周跳探測的原理，提出了一種三頻組合周跳檢測量的優(yōu)選方法，并利用該方法在不同偽距測量噪聲情況下，選取3個最優(yōu)的線性無關(guān)相位組合，組合檢驗量可以準確探測出各個頻率上大于或等于1周的周跳。 對IGS網(wǎng)站L5NetR8Test測試站的三頻原始觀測數(shù)據(jù)進行周跳探測，，采樣間隔為15s，未發(fā)現(xiàn)周跳，分別加入模擬的大周跳、小周跳和不敏感周跳或特殊周跳，兩種方法均正確探測出了模擬周跳。相位無幾何距離組合最多形成兩組線性無關(guān)的組合，由于15s采樣間隔多項式擬合頻間單差誤差最大可達0.6周，可能會引起取整錯誤。三頻相位減偽距組合的周跳估值標準差為0.2周左右，即使在偽距測量噪聲為3m的情況下，仍然能以95.5%的概率對組合周跳取整成功。
[Abstract]:Global satellite navigation systems, such as the modernized GPS in the United States, GLONASS in Russia, COMPASS in China and Galileo in Europe, are designed with multiple frequencies, and multi-frequency signals can form more data combinations with excellent characteristics. It provides more choices for cycle slip detection of carrier phase. In this paper, on the basis of the research on the detection and repair methods of single-frequency and dual-frequency cycle slips, based on the three-frequency data, we can form a combination of long wavelength, ionospheric / weak ionosphere, low noise and so on. Two new methods for detecting and repairing tri-frequency cycle slips after GNSS modernization are proposed: selecting two sets of phase-free geometric distance combinations (-1n ~ (-1) ~ (2) and (-1) ~ (4) ~ (-3), all cycle slips except sensitive cycle slips can be detected in 200 weeks. However, the detected combined cycle slip can not be fixed as an integer, nor can it be separated from the cycle slip on the base carrier. A third-order polynomial is used to fit the single frequency difference between L _ 1N _ 2 and L _ 5. The four equations are based on the principle of indirect adjustment. The cycle slips larger than or equal to one cycle at each frequency can be detected. This method is suitable for cycle slip detection at high sampling rate, and based on the principle of phase de-pseudo-range combined cycle slip detection, an optimal method for detecting three-frequency combined cycle slip detection is proposed. Using this method, three optimal linearly independent phase combinations are selected in the case of different pseudo-range noise measurements, and the combined tests can accurately detect the cycle slips which are greater than or equal to one cycle at each frequency. The three-frequency original observation data of L5NetR8Test test station on IGS website were detected by cycle slip. The sampling interval was 15s, no cycle slip was found, and simulated large cycle jump, small cycle jump and insensitive cycle jump or special cycle jump were added respectively. Both methods have correctly detected the simulated cycle slip. Two groups of linearly independent combinations are formed by the combination of phase no geometric distance at most. Because the maximum error of single difference between frequencies fitted by the polynomial of 15 s sampling interval can reach 0.6 weeks, it may cause rounding errors. The estimated standard deviation of cycle slip of tri-frequency phase de-pseudo-range combination is about 0.2 cycles. Even when the noise of pseudo-range measurement is 3m, the cycle slip can still be integrated successfully with a probability of 95.5%.
【學位授予單位】：遼寧工程技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228.4
本文編號：2131466
[Abstract]:Global satellite navigation systems, such as the modernized GPS in the United States, GLONASS in Russia, COMPASS in China and Galileo in Europe, are designed with multiple frequencies, and multi-frequency signals can form more data combinations with excellent characteristics. It provides more choices for cycle slip detection of carrier phase. In this paper, on the basis of the research on the detection and repair methods of single-frequency and dual-frequency cycle slips, based on the three-frequency data, we can form a combination of long wavelength, ionospheric / weak ionosphere, low noise and so on. Two new methods for detecting and repairing tri-frequency cycle slips after GNSS modernization are proposed: selecting two sets of phase-free geometric distance combinations (-1n ~ (-1) ~ (2) and (-1) ~ (4) ~ (-3), all cycle slips except sensitive cycle slips can be detected in 200 weeks. However, the detected combined cycle slip can not be fixed as an integer, nor can it be separated from the cycle slip on the base carrier. A third-order polynomial is used to fit the single frequency difference between L _ 1N _ 2 and L _ 5. The four equations are based on the principle of indirect adjustment. The cycle slips larger than or equal to one cycle at each frequency can be detected. This method is suitable for cycle slip detection at high sampling rate, and based on the principle of phase de-pseudo-range combined cycle slip detection, an optimal method for detecting three-frequency combined cycle slip detection is proposed. Using this method, three optimal linearly independent phase combinations are selected in the case of different pseudo-range noise measurements, and the combined tests can accurately detect the cycle slips which are greater than or equal to one cycle at each frequency. The three-frequency original observation data of L5NetR8Test test station on IGS website were detected by cycle slip. The sampling interval was 15s, no cycle slip was found, and simulated large cycle jump, small cycle jump and insensitive cycle jump or special cycle jump were added respectively. Both methods have correctly detected the simulated cycle slip. Two groups of linearly independent combinations are formed by the combination of phase no geometric distance at most. Because the maximum error of single difference between frequencies fitted by the polynomial of 15 s sampling interval can reach 0.6 weeks, it may cause rounding errors. The estimated standard deviation of cycle slip of tri-frequency phase de-pseudo-range combination is about 0.2 cycles. Even when the noise of pseudo-range measurement is 3m, the cycle slip can still be integrated successfully with a probability of 95.5%.
【學位授予單位】：遼寧工程技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228.4
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