Vehicle RF Hardware for GNSS Positioning Accuracy
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Solution Overview
Problem
Integrated GNSS chipsets in communication devices, such as cellular devices, often exhibit reduced positioning accuracy due to their limited capabilities in receiving and processing corrections to GNSS signals, leading to suboptimal performance compared to specialized GNSS receivers.
Innovation Solution
A radio frequency hardware component is integrated with or coupled to communication devices, featuring multiple antennas to receive L1 and L2C GNSS signals, which are then processed by a software-defined GNSS receiver. This setup decodes signals, corrects for ionospheric perturbations using carrier phase interferometry, and applies various techniques to smooth or correct pseudoranges, enhancing positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If integrated GNSS chipsets are used in communication devices, then device integration and communication functionality are improved, but positioning accuracy deteriorates
Solution Approach 1:
The system divides the GNSS processing function into two separate components: an integrated GNSS chipset for basic signal reception and a dedicated GNSS receiver for accurate positioning. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between integration and positioning accuracy.
Solution Approach 2:
A radio frequency hardware component acts as an intermediary between the integrated GNSS chipset and the dedicated GNSS receiver. This intermediary includes multiple antennas that receive signals from both sources, enabling the system to combine the communication functionality of integrated devices with the positioning accuracy of dedicated receivers.
2Measurement precision
If multiple antennas are added to receive GNSS signals, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The radio frequency hardware component with multiple antennas serves multiple functions: receiving GNSS signals from the integrated chipset, receiving correction signals from external sources, and providing input to the dedicated GNSS receiver. This multi-functionality justifies the added complexity by delivering significant positioning accuracy improvements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly improves positioning accuracy by enabling the extraction and processing of pseudorange information outside the GNSS chipset, providing more precise location fixes, including latitude, longitude, and altitude, and allowing for the application of advanced corrections like WAAS, DGPS, and RTK, achieving accuracy within meters to centimeters.
Implementation Method 1
A radio frequency hardware component is integrated with or coupled to communication devices, featuring multiple antennas to receive L1 and L2C GNSS signals
Implementation Method 2
which are then processed by a software-defined GNSS receiver. This setup decodes signals
Implementation Method 3
corrects for ionospheric perturbations using carrier phase interferometry
Data Source
AI summary
A vehicle-based 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 a location in a vehicle of the radio frequency hardware component to a separate communication device that is also coupled with the vehicle.