发明名称 |
Process for Improving the Continuity in the Case of a Two-Frequency Navigation Satellite System |
摘要 |
A process for improving continuity in a two-frequency navigation satellite system includes steps of i) observing the ionosphere by measurements in the two or more frequency bands; and ii) transmitting an alert message which informs user systems of a change of the ionosphere when at least one measurement indicates a change of the ionosphere that deviates from one or more predefined conditions.
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申请公布号 |
US2009289842(A1) |
申请公布日期 |
2009.11.26 |
申请号 |
US20090470230 |
申请日期 |
2009.05.21 |
申请人 |
ASTRIUM GMBH |
发明人 |
TRAUTENBERG HANS L. |
分类号 |
G01S1/00;G01S19/08;G01S19/20 |
主分类号 |
G01S1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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