GNSS Receiver Location Accuracy via Consecutive Satellite Measurements
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Solution Overview
Problem
Current radio communication systems, particularly GPS-based location determination in mobile devices, face limitations in precision and power consumption, failing to meet stringent FCC requirements for location accuracy and availability, especially in environments with obstacles like urban areas and densely constructed landscapes.
Innovation Solution
A method and system that enhance location accuracy by instructing GNSS receivers to acquire multiple consecutive satellite measurements, reducing errors due to satellite geometry, multipath, and occlusion, while maintaining a continuous monitor of satellite signals to decrease power consumption and improve time to first fix (TTFF).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple consecutive satellite measurements are acquired to improve location accuracy, then measurement precision is improved, but time consumption increases
Solution Approach 1:
The system performs preliminary actions by maintaining a continuous monitor of satellite signals and pre-acquiring measurements before a location request is made. This allows the receiver to be ready with measurement data already collected, reducing the time to first fix when a location request occurs while still achieving high accuracy through multiple measurements.
Solution Approach 2:
The system implements periodic action by continuously monitoring satellite signals at regular intervals and accumulating measurements over time. This periodic collection of multiple measurements improves location accuracy through statistical averaging while managing time consumption by using established monitoring cycles rather than ad-hoc measurement campaigns.
2Speed
If GPS receiver continuously monitors satellite signals to reduce time to first fix, then responsiveness is improved, but power consumption increases
Solution Approach 1:
The system uses periodic action by monitoring satellite signals continuously at established intervals rather than attempting real-time continuous monitoring. This allows the receiver to maintain readiness for quick location fixes while reducing power consumption by allowing brief intervals between monitoring cycles, balancing responsiveness with energy conservation.
Solution Approach 2:
The system maintains continuity of useful action by keeping the satellite signal monitor running in the background without requiring full activation of the location determination system. This continuous low-level monitoring preserves the ability to quickly provide location data when needed while consuming minimal power compared to full system activation.
3Measurement precision
If environmental characteristics are considered to select measurement strategy, then location accuracy in challenging environments is improved, but system complexity increases
Solution Approach 1:
The system uses an intermediary approach by introducing environmental characteristic analysis as a mediating layer between the satellite signal monitor and the measurement selection process. This intermediary component analyzes environmental factors and uses them to guide measurement strategies, improving accuracy in challenging environments while keeping the overall system complexity manageable through modular design.
Solution Approach 2:
The system applies parameter changes by adjusting measurement selection and processing parameters based on environmental characteristics. Rather than fundamentally changing the system architecture, it modifies operational parameters such as measurement thresholds, selection criteria, and processing intensity according to environmental conditions, achieving improved accuracy with minimal increase in system complexity.
Data Source
AI summary
A system and method for determining a location of a wireless device in a communications network. A request for satellite assistance data may be received from a requesting entity, and a reference location determined as a function of the request. One or more characterizing attributes may be identified as a function of the reference location, and a set of satellites determined as a function of the reference location. It may also be determined whether more than one set of signal measurements should be acquired from one or more satellites in the set of satellites as a function of the identified one or more characterizing attributes. The one or more sets of signal measurements may be acquired, and a location of the wireless device determined from the acquired measurements.