Satellite Receiver Navigation Against Signal Deception

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Solution Overview

Problem

Deception devices emit fraudulent satellite signals that can deceive hybrid navigation systems, leading to navigation errors and potential safety hazards for vehicles.

Innovation Solution

A navigation method that combines inertial and satellite positioning data using multiple detection processes to identify deception operations, including statistical analysis of positional corrections and correlation coefficients, and switches to an emergency navigation based on inertial data to correct for errors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the detection threshold is set relatively high to avoid false alerts, then false alerts are reduced, but the deception risk increases

Engineering Contradiction:

Improvefalse alert rateVSAvoiddeception risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the navigation system into multiple independent reference navigations (first reference navigation using satellite data, second reference navigation using non-satellite data) that operate in parallel. Each reference navigation is processed separately through their own Kalman filters and innovation tests, allowing the system to compare results without raising detection thresholds, thus maintaining both low false alert rates and low deception risk.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a deception detection unit as an intermediary that compares the results from multiple reference navigations. This intermediary layer analyzes the consistency between satellite-based and non-satellite-based navigations without requiring high detection thresholds in the individual navigation systems, thereby reducing both false alerts and deception risk simultaneously.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If satellite positioning data is used to compensate for inertial positioning errors, then long-term navigation accuracy is improved, but the system becomes vulnerable to deception operations

Engineering Contradiction:

Improvenavigation accuracyVSAvoiddeception vulnerability

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent segments the positioning data sources into satellite-based reference navigation and non-satellite-based reference navigation. By maintaining separate processing channels for satellite data and non-satellite data (inertial navigation), the system can use satellite data for accuracy improvement while independently monitoring it for deception through comparison with the non-satellite channel.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a feedback mechanism where the deception detection unit continuously monitors the consistency between satellite-based and non-satellite-based reference navigations. When deception is detected, the system provides feedback to switch from satellite-based navigation to non-satellite-based navigation, thereby maintaining accuracy while preventing deception exploitation.

Inventive Principle:

Principle #23Feedback

3Reliability

If multiple reference navigations are computed and compared to detect deception, then deception detection capability is improved, but device complexity increases

Engineering Contradiction:

Improvedeception detection capabilityVSAvoidnavigation system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent makes the Kalman filter and innovation test mechanisms universal by applying them to multiple reference navigations simultaneously. The same filtering and detection algorithms are reused for both satellite-based and non-satellite-based navigations, reducing the need for separate complex detection systems and managing overall system complexity while maintaining high deception detection capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12571921B2Navigation during a deception operation of a satellite signal receiver

Publication Date: 2026.03.10 SAFRAN ELECTRONICS & DEFENSE (FR)

AI summary

A navigation method based on satellite and inertial positioning data includes the following steps of computing: a first reference navigation, that is hybridised on the basis of inertial positioning data with positional corrections determined on the basis of satellite positioning data; a second reference navigation, that is hybridised on the basis of inertial positioning data; an emergency navigation on the basis of the second reference navigation, reset on the operational navigation then corrected by means of the positional corrections provided by the first reference navigation. A navigation system for implementing this method is also disclosed.