Extracting Pseudorange Data from Embedded GNSS Chipsets
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Solution Overview
Problem
Conventional cellular devices with integrated GNSS chipsets primarily provide position fixes but do not make available pseudorange information for external use, limiting its application in surveying and positioning operations.
Innovation Solution
An embedded GNSS chipset in cellular devices calculates and extracts pseudorange information, allowing its use outside the GNSS chipset for improved positioning accuracy through external processing and integration with other correction systems like WAAS and DGPS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional GNSS chipsets are used in cellular devices, then position fix capability is provided, but pseudorange information is not made available for external use
Solution Approach 1:
The patent extracts pseudorange information from the GNSS chipset and makes it available to external applications. The system captures raw GNSS data including pseudorange measurements and transfers them to external processing platforms where they can be utilized for surveying and positioning operations, thereby resolving the information availability constraint.
Solution Approach 2:
The patent introduces an intermediary data transfer mechanism between the GNSS chipset and external applications. This intermediary layer enables pseudorange information to be passed from the restricted GNSS environment to external processing platforms, facilitating external use while maintaining the integrated chipset architecture.
2Measurement precision
If pseudorange information is extracted and processed externally, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the positioning system into two functional parts: the GNSS chipset that performs signal acquisition and basic processing, and external processing platforms that handle advanced algorithms. This segmentation allows positioning accuracy to be improved through external computation while keeping the cellular device's core functionality relatively simple.
Solution Approach 2:
The patent creates a universal external processing interface that can be used for multiple positioning applications and correction services. The same infrastructure supports various functions including surveying, navigation, and integration with correction systems like WAAS and DGPS, thereby achieving improved accuracy without proportionally increasing complexity.
3Adaptability or versatility
If pseudorange data is made available for external use, then surveying applications become feasible, but access control mechanisms are required
Solution Approach 1:
The patent introduces an intermediary access control layer between the GNSS chipset and external applications. This mediator manages data access rights and enables selective disclosure of pseudorange information to authorized applications, thereby enabling surveying functionality while maintaining security through a dedicated access control mechanism.
Data Source
AI summary
A plurality of images are captured by an image capturing device that is an integral part of the mobile data collection platform from at least two different perspectives that depict a point of interest in a scene. Coincident with capture of each of the plurality of images, orientation information is obtained via orientation sensors of the mobile data collection platform, a position fix of an antenna associated with the mobile data collection platform is determined, and a position of an entrance pupil of the image capturing device is calculated. Scale information associated with at least one of the images is captured. Scene data comprises the images, the orientation information and the entrance pupil positions. A three dimensional position of the point of interest at the scene is determined based on photogrammetric image processing of the scene data.