Modified PPP Positioning Engine Using Broadcast Ephemeris Data
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Solution Overview
Problem
Traditional GNSS positioning techniques rely on third-party providers for precise orbit and clock information, limiting their accuracy and increasing costs, especially in applications requiring sub-meter precision like Precise Point Positioning (PPP).
Innovation Solution
A modified PPP technique that utilizes broadcast satellite orbit and clock information, adjusting the ambiguity dynamic and ambiguity estimate term within the positioning engine to mitigate errors, allowing for more accurate positioning without dependency on third-party services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional GNSS positioning techniques are used with third-party providers for precise orbit and clock information, then positioning accuracy can be improved, but dependency on external services increases and costs increase
Solution Approach 1:
The system uses self-service by enabling the mobile device to autonomously obtain and process broadcast ephemeris data from GNSS satellites without requiring external third-party providers. The positioning engine independently mitigates errors using broadcast orbit and clock information, making the system self-sufficient while maintaining high positioning accuracy
Solution Approach 2:
The invention extracts only the necessary broadcast ephemeris data directly from GNSS satellite signals that the mobile device needs for positioning, rather than relying on comprehensive third-party correction services. This extraction approach reduces dependency on external services while maintaining essential positioning functionality
2Measurement precision
If traditional GNSS positioning techniques are used with third-party providers, then positioning accuracy can be improved, but service costs increase
Solution Approach 1:
The system uses inexpensive broadcast ephemeris data that is freely available from GNSS satellites instead of expensive third-party correction services. The broadcast data is continuously updated by satellites, providing a cost-effective replacement for paid services while maintaining positioning accuracy
3Device complexity
If broadcast ephemeris data is used instead of third-party precise orbit and clock information, then dependency on third-party services is reduced, but error mitigation capability may worsen
Solution Approach 1:
The positioning engine changes parameters by adjusting the ambiguity dynamic and ambiguity estimate terms when using broadcast ephemeris data. This parameter adjustment compensates for the lower precision of broadcast data compared to third-party precise products, maintaining error mitigation capability while using independent broadcast information
Solution Approach 2:
The system performs preliminary error mitigation by pre-adjusting the ambiguity dynamic and ambiguity estimate parameters based on the characteristics of broadcast ephemeris data. This preliminary adjustment prepares the positioning engine to handle errors effectively before actual positioning calculations are performed
Data Source
AI summary
Embodiments described herein provide for enabling a mobile device comprising a GNSS receiver to implement a modified PPP technique that utilizes orbit and clock information of a satellite that is broadcast from the satellite. In particular, embodiments may utilize a positioning engine to perform PPP error mitigation with respect to various error sources (e.g., troposphere, ionosphere, phase windup, etc.). With regard to errors stemming from satellite orbit and satellite clock, embodiments may utilize orbit and clock information from broadcast ephemeris data rather than obtaining precise orbit and clock information (e.g., from a third party provider). Further, embodiments may account for errors in this broadcast information by adjusting the ambiguity dynamic and/or ambiguity estimate term used by the positioning engine. This can enable the positioning engine to determine a solution more accurate than traditional GNSS without resetting.