Real-time cycle slip detection in triple-frequency GNSS
Real-time cycle slip detection in triple-frequency GNSS
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DOI：
10.1007/s10291-011-0237-5
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发表时间：
2012-07-01
期刊：
影响因子：
4.9
通讯作者：
Sanso, Fernando
中科院分区：
文献类型：
--
作者：
Clara de Lacy, Maria;Reguzzoni, Mirko;Sanso, Fernando
全球定位系统的现代化和欧洲伽利略项目的出现将导致一个多频全球导航卫星系统。新频率的出现为全球导航卫星系统数据组合带来了更多的自由度。我们定义了GNSS观测的线性组合，目的是在真实的时间内检测和校正周跳。特别是，检测是基于在三个级联步骤中使用的五个无几何形状的线性组合。大多数的跳跃检测在第一步中使用三个最小噪声组合的相位和代码的意见。其余的跳跃与非常小的幅度检测在其他两个步骤中通过两个定制的相位观测的线性组合。一旦已经检测到滑动的历元，则使用相位观测的其他线性组合来估计其幅度。定义这些组合的目的是区分三个载波中跳变幅度的可能组合。该方法已被测试的模拟数据和1秒的三频非差GPS数据来自一个友好的多径环境。结果表明，该方法能够检测和修复三个载波的所有周跳组合。
The modernization of the global positioning system and the advent of the European project Galileo will lead to a multifrequency global navigation satellite system (GNSS). The presence of new frequencies introduces more degrees of freedom in the GNSS data combination. We define linear combinations of GNSS observations with the aim to detect and correct cycle slips in real time. In particular, the detection is based on five geometry-free linear combinations used in three cascading steps. Most of the jumps are detected in the first step using three minimum-noise combinations of phase and code observations. The remaining jumps with very small amplitude are detected in the other two steps by means of two-tailored linear combinations of phase observations. Once the epoch of the slip has been detected, its amplitude is estimated using other linear combinations of phase observations. These combinations are defined with the aim of discriminating between the possible combinations of jump amplitudes in the three carriers. The method has been tested on simulated data and 1-second triple-frequency undifferenced GPS data coming from a friendly multipath environment. Results show that the proposed method is able to detect and repair all combinations of cycle slips in the three carriers.