Satellite Correction Integrity Feedback for Fast Precise Positioning
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Solution Overview
Problem
Current navigation satellite systems face limitations in achieving precise and reliable position estimation due to distortion in signal transmission through the atmosphere, particularly in safety-critical applications like highly-automated driving and autonomous driving, where centimeter-level accuracy is required but convergence time is prolonged.
Innovation Solution
A method is developed to generate and broadcast correction information, including satellite orbit, clock, ionospheric, and tropospheric corrections, along with integrity information, to ensure the trustworthiness of these corrections, allowing for conditional use of the data until post-broadcast integrity information confirms their accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If correction information is broadcast immediately for use in positioning, then productivity is improved, but reliability deteriorates because integrity cannot be verified beforehand
Solution Approach 1:
The patent performs integrity monitoring of correction information before broadcasting it to users. The processing center validates the integrity of correction information (such as satellite orbit, clock, ionospheric, and tropospheric corrections) prior to transmission, ensuring that only verified accurate corrections are made available for positioning calculations.
Solution Approach 2:
The patent implements a feedback mechanism where the processing center continuously monitors the integrity of correction information and provides integrity status information back to monitoring stations and users. This feedback loop ensures that users can verify the trustworthiness of correction information before and during its use in positioning applications.
2Reliability
If integrity monitoring is performed on all correction information, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces a processing center as an intermediary between the correction information generation sources and the monitoring stations/users. This processing center centralizes the integrity monitoring functions, performing validation of correction information before distribution. By concentrating monitoring capabilities in a dedicated intermediary system, individual monitoring stations can operate with reduced complexity while still benefiting from comprehensive integrity verification.
Data Source
AI summary
Some embodiments of the invention relate to generating correction information based on global or regional navigation satellite system (NSS) multiple-frequency signals observed at a network of reference stations, broadcasting the correction information, receiving the correction information at one or more monitoring stations, estimating ambiguities in the carrier phase of the NSS signals observed at the monitoring station(s) using the correction information received thereat, generating residuals, generating post-broadcast integrity information based thereon, and broadcasting the post-broadcast integrity information. Other embodiments relate to receiving and processing correction information and post-broadcast integrity information at NSS receivers or at devices which may have no NSS receiver, as well as to systems, NSS receivers, devices which may have no NSS receiver, processing centers, and computer programs. Some embodiments may for example be used for safety-critical applications such as highly-automated driving and autonomous driving.