GNSS and 5G Signal Fusion for INS Urban Navigation
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Solution Overview
Problem
Existing GNSS/INS hybrid navigation systems face challenges in urban environments where satellite signal disturbances prevent the capture of the required number of GNSS satellites, leading to navigation solution failures, while tight-coupling systems are complex and loose-coupling systems lack sufficient information for accurate navigation.
Innovation Solution
A navigation system that integrates a wireless cellular network, specifically 5G, with GNSS and INS systems, using a hybrid architecture with tight coupling between satellite and base station signals for maximum information merging, and loose coupling with INS for adjustment, employing a SLAM estimator and extended Kalman filter to optimize navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tight coupling is used between GNSS and INS systems, then navigation accuracy is improved in environments with limited satellite availability, but system complexity increases substantially
Solution Approach 1:
The patent segments the coupling architecture into two distinct levels: a tight coupling layer between GNSS and cellular network that processes raw measurements and generates navigation solutions, and a loose coupling layer between INS and the GNSS/cellular system that performs adjustments. This segmentation allows the system to benefit from tight coupling accuracy while managing complexity through modular architecture.
Solution Approach 2:
The patent introduces an intermediary navigation solution generation module that processes raw GNSS and cellular measurements to produce navigation solutions, which then serve as input for the INS adjustment process. This intermediary layer decouples the complex tight coupling processing from the INS system, reducing overall system complexity while maintaining accuracy benefits.
2Device complexity
If loose coupling is used between GNSS and INS systems, then system complexity is reduced and implementation is simpler, but navigation solution availability decreases in urban environments with satellite signal disturbances
Solution Approach 1:
The patent merges multiple signal sources (GNSS satellites and cellular network base stations) into a unified navigation solution generation process. By combining these diverse signal sources at the measurement level through tight coupling, the system can maintain navigation solution availability in urban environments where satellite signals alone are insufficient.
Solution Approach 2:
The patent creates a multi-functional navigation system that can process both GNSS satellite signals and cellular network signals through the same tight coupling architecture. This universal processing capability allows the system to adapt to different signal availability conditions and maintain reliability across various operational environments.
3Duration of action of stationary object
If cellular network signals are integrated with GNSS signals, then navigation continuity is improved in environments with limited satellite availability, but information processing complexity increases
Solution Approach 1:
The patent implements a dynamic signal selection and processing mechanism that adapts to available signal sources. The system can dynamically switch between processing GNSS-only, cellular-only, or combined GNSS-cellular measurements based on signal availability, optimizing navigation continuity while managing processing complexity through adaptive behavior.
Solution Approach 2:
The patent changes the fundamental parameters of the navigation system by introducing cellular network signal parameters (base station positions, signal measurements) alongside traditional GNSS parameters. This parameter expansion enables continuous navigation in environments with limited satellite availability while the systematic processing approach manages the increased complexity.
Data Source
AI summary
Navigation device including an inertial navigation system coupled with a satellite navigation system, the information supplied by the satellite positioning system being used for adjusting the inertial navigation system, characterised in that the device further comprises means for measuring signals coming from base stations of a wireless cellular network, the satellite navigation system and the means for measuring signals coming from base stations of the wireless cellular network are coupled with each other by a tight coupling to form a satellite navigator and/or base-station navigator implementing an estimator with simultaneous localisation and mapping, and in that the satellite navigation system and the means for measuring signals coming from base stations of the wireless cellular network are coupled to the inertial navigation system by a loose coupling for adjusting the inertial navigation system.