Method of amending navigation data of a global navigation system

US8310395B2 · kind B2 · utility

Assignee

• ASTRIUM GMBH · DE

Inventor

• Veit Oehler · Neubiberg, DE

Key dates

• Filing date: Jun 17, 2010
• Grant date: Nov 13, 2012
• Expiry date: Feb 11, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S19/23
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

For amending navigation data of a global navigation system, navigation signals are received from a space vehicle, and a predicted clock phase offset of the clock signal sent from the space vehicle is estimated and stored in a memory. The clock phase offset difference between the current estimated clock phase offset and a previously estimated clock phase offset times (T1) is then computed and stored. An earlier computed phase offset difference between a previously estimated clock phase offset and a further previous estimation for said clock phase offset is obtained, wherein the time interval between the current measurement epoch and second earlier epoch is at least T1. The difference between the computed clock phase offset differences is derived, and compared with a given threshold value. If the latter difference is greater than the given threshold value, an integrity risk signal is generated and transmitted to other devices for position determination.