GNSS RF Front End for Carrier-Phase Positioning Accuracy
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Solution Overview
Problem
Integrated GNSS chipsets in communication devices often exhibit reduced positioning accuracy due to limited signal reception and processing capabilities, failing to provide a full range of features available in special-purpose receivers.
Innovation Solution
A radio frequency hardware component integrated with or coupled to communication devices, utilizing a software-defined GNSS receiver to decode GNSS signals, apply carrier phase interferometry, and perform corrections such as ionospheric perturbation adjustments, enhancing pseudorange information processing through techniques like WAAS, DGPS, and RTK.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If integrated GNSS chipsets are used in communication devices, then device integration and portability are improved, but positioning accuracy deteriorates
Solution Approach 1:
The system separates GNSS signal processing into two independent parts: the integrated GNSS chipset handles basic signal reception and initial processing, while a separate radio frequency hardware component dedicated to carrier phase interferometry performs high-precision measurements. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between integration and accuracy.
Solution Approach 2:
A radio frequency hardware component acts as an intermediary between the integrated GNSS chipset and the positioning system. This intermediary component receives signals from the chipset, performs specialized carrier phase interferometry processing, and provides corrected pseudorange information, thereby enhancing accuracy without requiring full integration of a specialized receiver.
2Measurement precision
If special purpose GNSS receivers are used, then positioning accuracy is improved, but device integration and versatility deteriorate
Solution Approach 1:
The radio frequency hardware component is designed to work with standard integrated GNSS chipsets while providing specialized processing capabilities. It performs carrier phase interferometry on top of the chipset's output, enabling the system to maintain versatility and integration while achieving special-purpose receiver accuracy for applications requiring high precision.
Solution Approach 2:
The specialized carrier phase interferometry processing capability is extracted from a full special-purpose receiver and implemented as a separate radio frequency hardware component that interfaces with the integrated GNSS chipset. This extraction allows the system to obtain high-precision processing without adopting the entire complex special-purpose receiver architecture.
3Device complexity
If conventional integrated GNSS chipsets are used, then device simplicity is maintained, but signal processing capability and positioning accuracy deteriorate
Solution Approach 1:
The radio frequency hardware component performs preliminary carrier phase interferometry processing on the pseudorange information before it is used for final positioning calculations. This preliminary action corrects errors and enhances accuracy in the raw data from the integrated GNSS chipset, improving measurement precision while maintaining overall system simplicity.
Data Source
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AI summary
A stand-alone radio frequency (RF) hardware component comprises first and second antennas, a digitizer, a serializer, and a serial output. The first antenna receives, over-the- air, a first analog Global Navigation Satellite System (GNSS) signal in a first frequency band. The second antenna receives, over-the-air, at least a second analog GNSS signal in a second frequency band, wherein the first frequency band and the second frequency band are separate and distinct. The digitizer digitizes the first analog GNSS signal into a first digitalized GNSS signal and digitizes the second analog GNSS signal into a second digitized GNSS signal. The serializer serializes the digitized GNSS signals into a serialized output signal. The serial output communicatively couples the digitized GNSS signals, as the serialized output signal, directly from the RF hardware component to a communication device that is removably couplable with the stand-alone RF hardware component.