[1] Yu Guorong, Sheng Renjun,. Cycle slip detection approachbased on time-relative positioning theory [J]. Journal of Southeast University (English Edition), 2005, 21 (3): 363-368. [doi:10.3969/j.issn.1003-7985.2005.03.023]
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Cycle slip detection approachbased on time-relative positioning theory(
)
基于时间相对定位理论的周跳探测方法
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 21
- Issue:
- 2005 3
- Page:
- 363-368
- Research Field:
- Surveying and Mapping and Navigation
- Publishing date:
- 2005-09-30
Info
- Title:
- Cycle slip detection approachbased on time-relative positioning theory
- 基于时间相对定位理论的周跳探测方法
- Author(s):
- Yu Guorong, Sheng Renjun
- College of Transportation, Southeast University, Nanjing 210096, China
- Keywords:
- global positioning system(GPS); cycle slips; time-relative positioning; satellite-receiver geometry
- PACS:
- P228.4
- DOI:
- 10.3969/j.issn.1003-7985.2005.03.023
- Abstract:
- An efficient cycle slip detection method is proposed for high precision positioning and navigation results with global positioning system(GPS), which is based on the assumption of a high sampling interval, measurement errors are so small that they can be ignored in the temporal single difference observables. And ambiguities are ordinarily equal to zero, but could be the number of cycles that have “slipped” if loss-of-lock has occurred.Therefore, cycle slips are estimated as parameters of time-relative positioning observation equations.Because the temporal single difference observables are taken at different epochs and different stations with a single GPS receiver, if time-relative positioning observation equations are linearized as that of conventional relative positioning, the design matrix will be rank defective.To obtain a stable linearization scheme, time-relative positioning observation equations are further analyzed, and the concept of virtual measurement is applied.A sample of data collected on a vehicle test shows that a cycle slip detection approach based on time-relative positioning theory can detect slips at the value of one cycle.The results also indicate if two satellites are so near to each other that they have the same equivalent to satellite-receiver geometry, cycle slip detection will be difficult and may get wrong results.Cycle slips of different satellites also affect detection by satellite-receiver geometry.
- 提出了一种有效的用于高精度GPS定位或导航的周跳探测方法, 该方法基于动态高采样率的假设, 则时间单差观测值中的各种误差很小以至可以忽略不计, 且模糊度参数值应当为零, 如果发生周跳, 模糊度参数的估值就是周跳, 所以周跳可作为未知参数加到时间相对定位方程中进行估计.因为时间单差观测值是由同一接收机在不同位置不同历元获得的观测值, 如果时间单差点位方程如同传统测站单差方程那样线性化, 将导致设计矩阵秩亏, 为获得稳定的线性化方案, 分析了时间相对定位方程, 引入了虚观测值的概念.车载试验数据处理结果表明, 基于时间相对定位理论的周跳探测方法可以探测到一周量值的周跳.结果还显示:如果2颗卫星过于接近, 其对站星几何图形的影响是等价的, 从而给周跳探测带来困难甚至可能得出错误结论;不同卫星发生的周跳也通过站星几何图形影响周跳探测.
References:
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Memo
- Memo:
- Biography: Yu Guorong(1971—), male, doctor, ygr.fish@163.com.