Real-time detection and repair of cycle slips in triple-frequency GNSS measurements
Real-time detection and repair of cycle slips in triple-frequency GNSS measurements
复制标题
三频 GNSS 测量中周跳的实时检测和修复
DOI：
10.1007/s10291-014-0396-2
复制
发表时间：
2015-07
期刊：
影响因子：
4.9
通讯作者：
Liu Jingnan
中科院分区：
文献类型：
--
作者：
Zhao Qile;Sun Binzi;Dai Zhiqiang;Hu Zhigang;Shi Chuang;Liu Jingnan
周期滑移检测和修复是利用全球导航卫星系统（GNSS）载波相位进行精确定位的先决条件。现代GNSS技术引入了三频或多频信号，有利于周跳检测和修复。提出了一种基于三频无差GNSS观测数据独立线性组合的实时周跳检测与修复方法。该方法在原始观测值的基础上形成三种类型的线性组合。这些组合被称为超宽车道（EWL）、宽车道（WL）和窄车道（NL）。在三个级联步骤中依次确定组合上的周期卡瓦。第一步采用无几何和无电离层的hatch - melbourne - wbbena组合来确定和修复EWL周期滑差。第二步从WL组合中减去循环滑移修复的EWL组合，以消除WL组合的几何部分。这种减法得到了一个包含WL模糊度和剩余电离层延迟的新函数。该函数在两个连续的历元处进行差分，以确定WL周跳。剩余电离层延迟差相对于WL波长较小，可以忽略。第三步以与第二步相同的方式确定NL周期滑动。不同之处在于，循环-滑移-修复的井眼测井组合被更精确的循环-滑移-修复井眼测井组合所取代。此外，剩余的电离层延迟差由原始载波相位观测得到的电离层延迟率补偿。当确定了EWL、WL和NL的周跳后，就可以唯一地识别原始载波相位观测的周跳。该方法在不同电离层变化水平下的30秒三频北斗导航卫星系统数据、30秒三频全球定位系统和准天顶卫星系统数据上进行了测试。结果表明，在低采样率或电离层活跃条件下，该方法可以实时地检测和校正每个频率上的周跳，即使是一个周期的周跳。
Cycle slip detection and repair are prerequisites to the use of the global navigation satellite system (GNSS) carrier phases for precise positioning. Modern GNSS techniques introduce triple- or multi-frequency signals that are beneficial for cycle slip detection and repair. We present a new real-time cycle slip detection and repair method based on the independent linear combinations of undifferenced triple-frequency GNSS observations. The proposed method forms three types of linear combinations based on the original observations. These combinations are called extra-wide lane (EWL), wide lane (WL), and narrow lane (NL). Cycle slips on the combinations are determined sequentially in three cascaded steps. The first step employs the geometry-free and ionosphere-free Hatch–Melbourne–Wübbena combination to determine and repair the EWL cycle slips. The second step subtracts the cycle-slip-repaired EWL combination from the WL combination to eliminate the geometry part of the WL combination. This subtraction results in a new function that contains the WL ambiguity and residual ionospheric delay. This function is differenced at two consecutive epochs to determine the WL cycle slips. The residual ionospheric delay difference is ignored because of its small magnitude relative to WL wavelength. The third step determines the NL cycle slips in the same manner as in the second step. The difference is that the cycle-slip-repaired EWL combination is replaced with the more accurate cycle-slip-repaired WL combination. Moreover, the residual ionospheric delay difference is compensated by the ionospheric delay rate derived from the original carrier phase observations. When the EWL, WL, and NL cycle slips are determined, cycle slips on the original carrier phase observations can be uniquely identified. The proposed approach has been tested on 30-s triple-frequency BeiDou navigation satellite system data under different levels of ionospheric variations, and on 30-s triple-frequency global positioning system and quasi-zenith satellite system data. Results indicate that the approach can effectively detect and correct cycle slips even for one cycle under low sampling rate or active ionospheric conditions on each frequency in real time.
登录
查看更多内容
DOI：
--
发表时间：
1982
期刊：
--
影响因子：
--
作者：
R. Hatch
通讯作者：
R. Hatch
DOI：
10.1007/978-3-7091-3311-8
发表时间：
1992
期刊：
--
影响因子：
--
作者：
B. Hofmann-Wellenhof;H. Lichtenegger;J. Collins
通讯作者：
B. Hofmann-Wellenhof;H. Lichtenegger;J. Collins
DOI：
--
发表时间：
2007
期刊：
--
影响因子：
--
作者：
G. Beutler;H. Bock;R. Dach;P. Fridez;A. Gäde;U. Hugentobler;A. Jäggi;M. Meindl;L. Mervart;L. Prange;Stefan Schär;T. Springer;C. Urschl;P. Walser
通讯作者：
G. Beutler;H. Bock;R. Dach;P. Fridez;A. Gäde;U. Hugentobler;A. Jäggi;M. Meindl;L. Mervart;L. Prange;Stefan Schär;T. Springer;C. Urschl;P. Walser
影响因子：
4.9
作者：
Clara de Lacy, Maria;Reguzzoni, Mirko;Sanso, Fernando
通讯作者：
Sanso, Fernando
影响因子：
4.9
作者：
Wang, Guangxing;de Jong, Kees;Guo, Jing
通讯作者：
Guo, Jing