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Method for checking integrity of satellite radionavigational signal

A satellite and signal technology, applied in the field of GNSS receivers, can solve the problem of reducing the integrity level of the satellite navigation system, and achieve the effect of avoiding high cost and measurement discontinuity

Inactive Publication Date: 2020-09-22
THALES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

False locks can reduce the integrity level of satellite navigation systems

Method used

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  • Method for checking integrity of satellite radionavigational signal
  • Method for checking integrity of satellite radionavigational signal
  • Method for checking integrity of satellite radionavigational signal

Examples

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Embodiment Construction

[0078] A specific embodiment of the present invention is based on an example of a method for anti-jamming processing of radio frequency signals transmitted by satellites, the method comprising the following steps:

[0079] - receiving said radio frequency signal at M different input points (antennas and / or sensors);

[0080] - determine the correlation between two signal samples obtained from the reception of said signal at L different instants and at said M input points, then determine the weighting coefficients W, M and L is a positive integer, M is strictly greater than or equal to 1, and L is strictly greater than 1;

[0081] - Obtaining the processed anti-interference signal (S proccessed ).

[0082] Anti-jamming processing is performed at the receiver level.

[0083] An example of anti-jamming processing is a STAP filter (STAP is an acronym for "Space-Temporal Adaptive Processing"), and in this case, S processed is S stap ; or a TAP filter (TAP is an acronym for "Ti...

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Abstract

The invention relates to a method and a function for checking the integrity of the processing of a radionavigation signal emitted by a satellite, said signal being received by a receiver comprising reception means and processing means, said processing means comprising a linear anti-interference filter, said integrity checking method comprising at least a first phase of detection of a risk of falselock-on comprising the following steps: a step of recovery of a nominal theoretical self-correlation function of said received signal not processed by the linear anti-interference filter; a step of determination of a mean theoretical self-correlation function of said signal received and processed by the linear anti-interference filter over a defined integration period; a step of determination ofthe number of local maxima of the modulus or of the modulus squared of the mean theoretical self-correlation function, a risk of false lock-on being detected if said number of local maxima is greaterthan or equal to two.

Description

technical field [0001] The present invention relates to the field of systems for processing satellite or pseudolite radio navigation signals, and more particularly to GNSS receivers including anti-jamming processing. [0002] The invention relates more particularly to a method and functionality for verifying the integrity of a GNSS receiver including anti-jamming processing functionality with respect to the risk of false lock. Background technique [0003] Satellite positioning systems (designate GNSS as "Global Navigation Satellite System") implement multiple satellites emitting radio frequency signals and GNSS receivers placed at the location to be located to estimate distances called "pseudoranges" based on received The travel time of the satellite signal multiplied by the speed of light in the medium through which it travels separates the GNSS receiver from the satellite. Based on measurements of the pseudorange separating the receiver from visible satellites and inform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/20G01S19/21
CPCG01S19/20G01S19/21G01S19/30H04K3/90G01S19/36H04K3/228
Inventor N·马丁D·米尔伍德S·罗莱
Owner THALES SA
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