Virtual GPS Signal Reconstruction for Navigation Continuity
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Solution Overview
Problem
GPS navigation systems face limitations in providing uninterrupted and accurate positioning in GPS-denied environments, such as urban areas, tunnels, or areas with jamming, where additional sensors like IMUs can only maintain accuracy for short periods, increasing device size, weight, and power consumption.
Innovation Solution
The method combines GPS data with supplemental sensor information and filtering techniques to provide GPS-like navigation for extended periods without increasing size, weight, or power consumption, and includes an early warning system for GPS signal spoofing or blocking, using satellite position knowledge and navigation estimation algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional sensors (IMUs, laser range-finders, cameras) are added to supplement GPS, then navigation continues in GPS-denied situations, but device size, weight, and power consumption increase
Solution Approach 1:
The patent creates a virtual GPS signal by copying the structure and characteristics of real GPS signals using inertial navigation data and signal reconstruction algorithms. This virtual signal mimics authentic GPS transmissions, allowing the receiver to process positioning data without actual satellite signals, thereby maintaining navigation functionality without adding physical sensor hardware
Solution Approach 2:
The patent replaces the need for additional physical sensors (mechanical/inertial systems) with a signal processing-based approach. By substituting hardware supplementation with algorithmic signal reconstruction and inertial data fusion, the system achieves GPS-denied navigation without the weight penalty of additional sensing equipment
2Reliability
If additional sensors (IMUs, laser range-finders, cameras) are added to supplement GPS, then navigation continues in GPS-denied situations, but power consumption increases
Solution Approach 1:
The patent creates a virtual GPS signal by copying the structure and characteristics of real GPS signals using inertial navigation data and signal reconstruction algorithms. This virtual signal mimics authentic GPS transmissions, allowing the receiver to process positioning data without actual satellite signals, thereby maintaining navigation functionality without adding physical sensor hardware
Solution Approach 2:
The patent replaces the need for additional physical sensors (mechanical/inertial systems) with a signal processing-based approach. By substituting hardware supplementation with algorithmic signal reconstruction and inertial data fusion, the system achieves GPS-denied navigation without the power consumption penalty of additional sensing equipment
3Reliability
If additional sensors (IMUs, laser range-finders, cameras) are added to supplement GPS, then navigation continues in GPS-denied situations, but manufacturing cost increases
Solution Approach 1:
The patent creates a virtual GPS signal by copying the structure and characteristics of real GPS signals using inertial navigation data and signal reconstruction algorithms. This virtual signal mimics authentic GPS transmissions, allowing the receiver to process positioning data without actual satellite signals, thereby maintaining navigation functionality without adding physical sensor hardware
Solution Approach 2:
The patent replaces the need for additional physical sensors (mechanical/inertial systems) with a signal processing-based approach. By substituting hardware supplementation with algorithmic signal reconstruction and inertial data fusion, the system achieves GPS-denied navigation without the manufacturing cost increase of additional sensing equipment
4Measurement precision
If supplemental sensors are used, then positional accuracy is maintained for short periods, but accuracy degrades over time
Solution Approach 1:
The patent implements continuous signal reconstruction and inertial data fusion that maintains positioning accuracy indefinitely during GPS-denied periods. The system continuously updates the virtual GPS signal using ongoing inertial measurements and applies filtering algorithms to prevent drift accumulation, ensuring sustained accuracy without the time-limited performance of traditional sensor supplementation
Solution Approach 2:
The patent employs feedback mechanisms through Kalman filtering and adaptive signal reconstruction that continuously monitor and correct positioning estimates. The system uses feedback from inertial sensor data to adjust and refine the virtual GPS signal in real-time, compensating for drift and maintaining accuracy over extended periods beyond what traditional sensor fusion achieves
Data Source
AI summary
A method for calculating a position of a receiver. The method includes determining a first position of the receiver at a first time using data from satellites and determining a second position of the receiver at a second time using the first position and data from a non-satellite sensor. The method also includes calculating the positions of the satellites at the second time and comparing, for each satellite, the calculated position with a known position at the second time.