Cellular Control Channel GNSS Correction for Precision Positioning
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Solution Overview
Problem
Current GNSS correction systems for precision navigation face reliability and latency issues due to the need for expensive on-site correction devices and reliance on internet connectivity, which can lead to interruptions and inaccuracies when rovers move out of range or switch cellular networks.
Innovation Solution
Providing GNSS correction information over the control channels of a cellular network, allowing local generation and transmission by cellular base stations, enabling rovers to monitor multiple cells simultaneously and reducing the need for dedicated data connections, thus increasing accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GNSS correction information is transmitted over Internet-based cellular data networks, then correction information can be delivered to rovers, but latency and reliability deteriorate due to multiple network handoffs and potential connection failures
Solution Approach 1:
The patent extracts GNSS correction information from the Internet-based data network path and transmits it directly over cellular control channels. This separates the correction information delivery from the problematic Internet routing path, eliminating multiple handoffs and reducing latency while improving reliability through direct cellular transmission.
Solution Approach 2:
The patent introduces cellular control channels as an intermediary transmission medium between the correction information source and the rover. This intermediary provides a more reliable and lower-latency path compared to Internet-based data networks, as control channels are dedicated signaling paths with higher priority and fewer handoff requirements.
2Measurement precision
If on-site GNSS correction generation devices are used, then correction accuracy can be maintained, but device cost and setup complexity increase
Solution Approach 1:
The patent makes cellular base stations multi-functional by enabling them to generate and transmit GNSS correction information in addition to their standard cellular communication functions. This eliminates the need for separate, expensive on-site correction devices, as existing cellular infrastructure can serve dual purposes: communication and precision positioning support.
Solution Approach 2:
The patent enables cellular base stations to self-generate GNSS correction information using their own GNSS receivers, eliminating the need for external correction devices. The base stations serve themselves by producing the correction data they need to provide to rovers, reducing system complexity and deployment costs.
3Reliability
If rovers stay within range of wireless transmission from on-site devices, then correction information can be received continuously, but mobility and operational range are limited
Solution Approach 1:
The patent transitions the correction information transmission from a localized wireless direct transmission model to a networked cellular infrastructure model. This dimensional change allows rovers to receive correction information across much larger geographical areas by leveraging the extensive coverage of cellular networks, eliminating the range limitations of on-site devices.
Data Source
AI summary
Disclosed is a method of calculating a geospatial position by a mobile device by monitoring with the mobile device a first control channel from a first cell of a cellular communications system; monitoring with the mobile device a second control channel from a second cell of the cellular communications system at the same time as the first cellular control channel; receiving with the mobile device a first correction value sent over the first control channel; receiving with the mobile device a second correction value sent over the second control channel; receiving with the mobile device a signal from a global navigation satellite system; calculating with the mobile device the geospatial position based upon the signal from the global navigation satellite system and at least one of the first correction value and the second correction value.