| ASF Correction Within an Integrated Navigation System of Loran-C/RDSS | |
| Chen, Hongqing; Chen, Xiuming | |
| 2007 | |
| 会议名称 | 2007 National Technical Meeting of the Institute-of-Navigation |
| 会议录名称 | PROCEEDINGS OF THE 2007 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2007 |
| 会议日期 | JAN 22-24, 2007 |
| 会议地点 | San Diego, CA |
| 产权排序 | 1 |
| 摘要 | Two geostationary satellites of the Radio Determination Service System (RDSS) can be constructed as a new integrated navigation system combined with two Loran-C stations. A common time reference used for navigation can be formed of the atomic clocks of the RDSS with the Loran-C system by comparing those clocks. It can also be measured and transmitted the time difference between the transmitting time of the Loran-C signals from the antennas relative to the common time reference. Thus the Loran-C signals combined with the RDSS satellite signals can become a new positioning platform. At the same time, an integrated receiver deals with the Loran-C signals as pseudo-satellite signals of the RDSS on the ground and determinates 3D position of the receiver and the difference of the receiver clock relative to the common time reference by use of four signals from RDSS satellites with Loran-C stations. It is the major source of positioning error that the Additional Secondary Factor (ASF) of Loran-C signal propagation over land path within this integrated system. The better way is making an ASF correction table over the coverage of Loran-C signals in China. A numerical integral equation mothed for calculating the propagation delay & field strength of Loran-C groundwave signal has been employed for ASFcorrection with a Geographical Information System (GIS) software included the geo-information of longitude, latitude, altitude, ground electronic parameter, atmospheric refractive index. In October 2004 & July 2005, actual ASF measurement over an area around the Huangshan mountain was carried out. The theoretical predicted ASF by the GIS software & the traditionary Millington method have been compared with the actual measured ASF. The result shows the errors of predicting ASF reduce to about 0.5 microsecond. |
| 部门归属 | 守时理论与方法研究室 |
| 收录类别 | CPCI |
| 语种 | 英语 |
| 文献类型 | 会议论文 |
| 条目标识符 | http://210.72.145.45/handle/361003/5294 |
| 专题 | 守时理论与方法研究室 |
| 推荐引用方式 GB/T 7714 | Chen, Hongqing,Chen, Xiuming. ASF Correction Within an Integrated Navigation System of Loran-C/RDSS[C],2007. |
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