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Method for correcting prediction errors of signal values with time variation subjected to interference by various uncontrollable systematic effects

A time-varying, signal-value technology, applied to measuring devices, beacon transmitters, radio wave measurement systems, etc., can solve problems such as limited possibilities and limited data accuracy

Inactive Publication Date: 2011-10-12
THALES SA
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Problems solved by technology

[0022] - the accuracy of the data related to the equipment and components of the satellite is very limited, because the possibility of observing them after the launch of the satellite is very limited

Method used

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  • Method for correcting prediction errors of signal values with time variation subjected to interference by various uncontrollable systematic effects
  • Method for correcting prediction errors of signal values with time variation subjected to interference by various uncontrollable systematic effects
  • Method for correcting prediction errors of signal values with time variation subjected to interference by various uncontrollable systematic effects

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Embodiment Construction

[0033] The present invention is described below with reference to signals received from radio navigation satellites, but it is obvious that the present invention is not limited to this single application, it can be implemented in various applications, where the received signal varies with time in an at least partly non-random manner, and It is interfered by various system reasons, and there is a history of changes in these interference signals.

[0034] The present invention is based on the fact that an accurate orbit prediction algorithm works in batch mode (processing a large number of continuous values ​​contained within a period of time or "arc"), and its first step is to force an accurate estimation along the path related to the past The position and orbit parameters of the estimated arc satellite. The estimated position is then inferred for the prediction period to provide a prediction of orbital parameters.

[0035] In the current situation, the determined time period used ...

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Abstract

The present invention relates to a method for correcting the prediction of signal values with time variation, in particular for navigation messages sent by global satellite navigation systems, characterised in that the method comprises the following steps for correcting the predictions of a parameter included in a received signal and varying with time: estimating the prediction error from a first lot of values estimated during a predetermined period of time by comparing said values with previously predicted values for the same predetermined period of time; analysing the predicted time series of prediction errors by a signal processing method and isolating the contributions of systematic effects; extrapolating the behaviour of the contributions of the systematic effects during the time period in question, and correcting the predictions using the values thus extrapolated.

Description

Technical field [0001] The present invention relates to a method for correcting the prediction of time-varying signal values ​​disturbed by various uncontrollable system effects. Background technique [0002] Navigation messages sent by global satellite navigation systems (such as Galileo, GPS, etc.), as the global satellite navigation systems have their own added systems (EGNOS, WAAS, etc.) that increase their integrity, they also include the orbits for these satellites Forecast information and reference time information. Using these predictions, users of these navigation services calculate their estimated positions based on pseudo-distance measurements. [0003] Any errors that affect the results of these predictions result in errors in the value of the user's geographic location determined in this way. In the case where security is the primary issue for the service, set the integrity monitoring field, monitor the user’s integrity by checking the validity of the prediction, and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/00G01S19/08
CPCG01S19/02G01S19/08G01S19/22G01S19/09G01S19/14
Inventor M·范德博谢
Owner THALES SA
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