三频数据组合在周跳探测与修复中的应用

发布时间：2018-07-18 09:22

【摘要】：现代化后的美国GPS，俄罗斯的GLONASS、中国的COMPASS以及欧洲的Galileo等全球卫星导航系统均设计采用多个频率，多频信号可以形成更多具有优良特性的数据组合，为载波相位的周跳探测提供了更多选择。本文在单频和双频周跳探测与修复方法研究的基础之上，基于三频数据能形成长波长、消电离层/弱电离层、低噪声等优良特性的组合，对GNSS现代化后的三频周跳探测与修复提出了两种新的方法：选取两组相位无几何距离组合(-1,-1,2)和(-1,4,-3),在200周内可以探测出除敏感周跳外的所有周跳，但探测出的组合周跳值不能固定为整数，也无法进行基础载波上的周跳值分离，用一个三阶多项式拟合L1、L2和L5的频间单差值，这四组方程按照间接平差原理，可以探测出各个频率上大于或等于1周的周跳，这种方法适用于高采样率下的周跳探测；基于相位减伪距组合周跳探测的原理，提出了一种三频组合周跳检测量的优选方法，并利用该方法在不同伪距测量噪声情况下，选取3个最优的线性无关相位组合，组合检验量可以准确探测出各个频率上大于或等于1周的周跳。对IGS网站L5NetR8Test测试站的三频原始观测数据进行周跳探测，，采样间隔为15s，未发现周跳，分别加入模拟的大周跳、小周跳和不敏感周跳或特殊周跳，两种方法均正确探测出了模拟周跳。相位无几何距离组合最多形成两组线性无关的组合，由于15s采样间隔多项式拟合频间单差误差最大可达0.6周，可能会引起取整错误。三频相位减伪距组合的周跳估值标准差为0.2周左右，即使在伪距测量噪声为3m的情况下，仍然能以95.5%的概率对组合周跳取整成功。
[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%.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4

【参考文献】