GNSS單歷元基線解算方法研究
[Abstract]:The GNSS single epoch location algorithm is independent of cycle slip and can be reinitialized immediately after the satellite has lost its lock. When the observation environment is bad, the single epoch data utilization ratio is higher than that of multiple epoch observations. High-precision real-time positioning requires fast and correct fixing of ambiguity. Although the ambiguity of double frequency single epoch is fixed in practical application, its efficiency and reliability are verified, but its performance is easily affected by observation environment. Because the single frequency observations are affected by the number of tracking satellites, the baseline length and the observation environment, the ambiguity initialization usually takes several minutes. The combination of multiple GNSS systems provides new ideas and data support for ambiguity fixation. In this paper, aiming at the fixed ambiguity of single epoch and its baseline solution, the following aspects are mainly studied: 1) the general situation of different GNSS systems and the causes of the pathological problems in the measurement process and their solutions are briefly introduced in this paper. Focusing on the analysis of the combination of GPS and BDS (2) based on the derivation of carrier double difference observation equation, this paper analyzes the pathological reasons of the equation in the fixed ambiguity of single epoch. In view of the short baseline, only single frequency carrier phase is used to construct the double differential carrier equation. By means of regularization correlation theory, the rank deficiency problem and the least square floating point solution of the single epoch observation equation are solved. The success rate of integer ambiguity fixation of single epoch is improved. 3) for the problem of low fixed rate of single epoch ambiguity of medium and long baseline, the short baseline single epoch ambiguity fixation method is used for reference. Two-step regularization is used to realize the fixed ambiguity of double frequency single epoch, that is, through pseudo-range and wide-lane carrier combination, the single-epoch wide-lane ambiguity is fixed by one-step regularization. On this basis, the ionospheric combination is constructed. Combined with the fixed wide lane ambiguity, the original carrier ambiguity is fixed by the second step regularization.) aiming at the correlation between the tropospheric residual error and the elevation direction after the middle and long baseline ambiguity is fixed, In this paper, the delocalization matrix is constructed by the tropospheric delay coefficient, and the influence of the number of tropospheric parameters on the de-correlation is considered. The effect of considering a tropospheric parameter is good, and the positioning accuracy of elevation direction is improved effectively. The accuracy of 56 km baseline plane and elevation reach millimeter level 170 km baseline. The accuracy is better than 2 cm..
【學(xué)位授予單位】:安徽理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:P228.4
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