Geographic Positioning Obstacle Verification
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Solution Overview
Problem
Existing geographic positioning systems face errors in calculating position fixes due to occluded satellite signals and atmospheric factors, leading to potentially erroneous location estimates.
Innovation Solution
A method and system that utilize imagery processing to identify occlusions and generate obstacle maps, allowing for the verification of line-of-sight conditions between satellites and receivers, and incorporating atmospheric parameter estimation to correct for delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If satellite signals are received for position fix calculation, then position estimation is achieved, but errors occur due to occluded signals and atmospheric factors
Solution Approach 1:
The system performs preliminary identification of occlusions using imagery data before calculating the position fix. By determining whether obstacles occlude satellite signals in advance, the system can exclude affected signals from the position calculation, thereby improving accuracy while maintaining reliable positioning.
2Measurement precision
If imagery processing is performed to identify occlusions, then position fix accuracy is improved, but computational complexity increases
Solution Approach 1:
Occlusion identification using imagery data is performed in advance before position fix calculation. This preliminary action allows the system to pre-determine which satellite signals are occluded, simplifying the main positioning process by excluding known problematic signals and reducing real-time computational burden.
3Measurement precision
If atmospheric corrections are applied, then position fix accuracy is improved, but processing time increases
Solution Approach 1:
Atmospheric parameter estimation and correction calculations are performed in advance before the final position fix is computed. By determining atmospheric delays and applying corrections preliminarily, the system reduces the time required for the main positioning calculation while maintaining high accuracy through proper atmospheric compensation.
Data Source
AI summary
A position fix identifying a geographic location of a receiver is received. The position fix was generated using signals received at the receiver from respective high-altitude signal sources (such as satellites). Imagery of a geographic area that includes the geographic location is also received. The imagery is automatically processed to determine whether one or more of the high-altitude signal sources were occluded from the geographic location when the position fix was generated. In response to determining that one or more of the high-altitude signal sources were occluded from the geographic location when the position fix was generated, the position fix is identified as being potentially erroneous.