Extracting Pseudorange Data from Integrated GNSS Chipsets
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Solution Overview
Problem
Conventional cellular devices with integrated GNSS chipsets primarily provide position fixes but do not offer access to pseudorange information for use outside the GNSS chipset, limiting their functionality in applications requiring additional positioning parameters.
Innovation Solution
An embedded GNSS chipset in cellular devices calculates and extracts pseudorange information, allowing its use outside the GNSS chipset through a Secure User Platform Location (SUPL) client, which processes and improves the accuracy of this information using various correction methods like WAAS, DGPS, and carrier phase smoothing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional integrated GNSS chipsets are used in cellular devices, then position fix capability is provided, but pseudorange information is not accessible outside the GNSS chipset
Solution Approach 1:
The patent extracts pseudorange information from the integrated GNSS chipset and makes it accessible outside the chipset through a SUPL client. This allows external applications to utilize pseudorange data for enhanced positioning capabilities while maintaining the integrated chipset architecture.
Solution Approach 2:
The patent introduces a SUPL client as an intermediary component that bridges the gap between the integrated GNSS chipset and external applications. The SUPL client retrieves pseudorange information from the chipset and provides it to external systems, enabling information access without requiring chipset redesign.
2Measurement precision
If pseudorange information is extracted and processed using correction methods, then position accuracy is improved, but system complexity increases
Solution Approach 1:
The patent implements a multi-functional processing system that handles multiple correction methods (WAAS, DGPS, carrier phase smoothing) within the SUPL client. This universal approach allows the same infrastructure to support various correction techniques, improving position accuracy without proportionally increasing system complexity.
Solution Approach 2:
The integrated GNSS chipset performs self-processing of pseudorange information using embedded correction algorithms. The chipset autonomously applies corrections and provides improved position data, reducing the burden on external processing systems while maintaining high accuracy.
Data Source
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Figure 1C
AI summary
A Global Navigation Satellite System (GNSS) chipset embedded within the cellular device is accessed. The GNSS chipset calculates raw pseudoranges. The raw pseudoranges are extracted from the GNSS chipset for processing elsewhere in the cellular device outside of the GNSS chipset. A position fix is calculated based on the raw pseudoranges. At a first point in time, a first image, and at a second point in time, a second image are obtained with an image capturing device that is in a known physical relationship with the cellular device. An estimate of a distance that the cellular device moved from the first point in time to the second point in time is calculated by processing image data collected from the first point in time to the second point in time. The position fix is processed based on the estimate of the distance.