In-Vehicle GPS Data Segmentation for CAN Bus Transmission
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Solution Overview
Problem
Conventional in-vehicle communication systems face challenges in transmitting high-resolution location data, such as latitude and longitude information, due to data size limitations, leading to potential transmission delays and losses, which can result in inaccurate adaptive cruise control systems.
Innovation Solution
The system divides high-resolution latitude and longitude data into high-order and low-order data, transmitting them in separate frames to mitigate data transmission delays and losses, allowing for accurate reconstruction and correction of location data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution location data is transmitted through the communication bus, then the data precision is improved, but the data transmission reliability deteriorates due to transmission delays and losses
Solution Approach 1:
The patent divides high-resolution location data into high-order data and low-order data, transmitting them in separate data frames. This segmentation allows the data to fit within permissible frame size limits while maintaining overall precision when reconstructed at the receiver. The division resolves the contradiction by enabling transmission of precise data without exceeding communication bus constraints that would cause delays or losses.
2Reliability
If high resolution location data is divided into high order data and low order data and transmitted separately, then the data transmission reliability is improved, but the device complexity increases
Solution Approach 1:
The division of location data into high-order and low-order components with separate transmission frames introduces additional processing steps at both transmitter and receiver. While this segmentation improves reliability by preventing transmission delays and losses, it simultaneously increases device complexity through the need for data division, separate frame transmission, and reconstruction processes.
Solution Approach 2:
The patent introduces an intermediary reconstruction process that combines high-order and low-order data frames to recreate the original high-resolution location data. This intermediary step mediates between the segmented transmitted data and the final reconstructed data, ensuring reliability while managing the complexity through a systematic reconstruction algorithm.
3Measurement precision
If the data frame size is increased to accommodate high resolution data, then the measurement precision is improved, but the communication system compatibility deteriorates
Solution Approach 1:
Instead of increasing the data frame size to accommodate high-resolution location data, the patent segments the data into high-order and low-order portions that each fit within the permissible frame size limits of existing communication systems. This segmentation approach maintains compatibility with conventional communication protocols while enabling transmission of high-precision location information through multiple smaller frames.
Data Source
AI summary
In a communication system, a transmitting unit divides each of latitude data and longitude data of a current location transmitted from a GPS receiver, at a predetermined digit position, into high order data and low order data. The transmitting unit makes a high order frame containing the high order data of each of the latitude data and the longitude data, and a low order frame containing the low order data of each of the latitude data and the longitude data, and transmits the high order frame and the low order frame, independently to a CAN bus. A receiving unit combines the high and low order data regarding the latitude data together, and further combines the high and low order data regarding the longitude data, extracted from the received high and low order frames in order to reconstruct the latitude data and the longitude data of the current location.