Vehicle Antenna Control Using Inversion Codes for Accurate Key Positioning
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Solution Overview
Problem
Existing vehicle authentication systems face errors in detecting the position of portable devices due to crosstalk between antennas, particularly when radiation noise from the transmission control device interferes with the signal reception, leading to incorrect positioning of the portable device inside or outside the vehicle compartment.
Innovation Solution
A transmission control device that uses multiple antennas with non-overlapping transmission ranges, where a genuine transmission antenna sends an activation code and an inversion transmission antenna sends an inversion code concurrently, ensuring the portable device receives the genuine code without interference from radiation noise by crushing the pattern of the genuine code with the inversion code.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antennas are used to detect portable device position, then positioning capability is improved, but crosstalk between antennas causes measurement errors
Solution Approach 1:
The system segments the transmission space by assigning different transmission ranges to different antennas. The first antenna transmits in a first spatial region while the second antenna transmits in a second spatial region, creating non-overlapping transmission zones that eliminate crosstalk interference while maintaining multi-antenna positioning capability
Solution Approach 2:
Each antenna is configured with localized transmission characteristics - the first antenna has a transmission range limited to a first region, and the second antenna has a transmission range limited to a second region. This local quality differentiation ensures that each antenna's signal is confined to its designated spatial zone, preventing interference with other antennas while preserving accurate position detection
2Area of stationary object
If transmission range is extended to cover more area, then coverage is improved, but radiation noise interferes with signal reception
Solution Approach 1:
The total transmission coverage is segmented into multiple non-overlapping regions, each handled by a separate antenna. This segmentation allows the system to achieve broad overall coverage while each individual antenna operates within a limited zone, preventing radiation noise from interfering with signal reception in other zones
Solution Approach 2:
The spatial region acts as an intermediary that mediates between transmission coverage and noise interference. By confining each antenna's transmission to a specific spatial region, the system achieves extensive coverage through multiple antennas while the spatial separation prevents radiation noise from any single antenna from interfering with signals in other regions
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
This configuration effectively prevents erroneous detection of the portable device's position by ensuring the portable device receives the genuine code accurately within its transmission range, reducing false positives caused by radiation noise from the transmission control device.
Implementation Method 1
a genuine transmission control unit that transmits, from a genuine transmission antenna with use of a carrier wave, a genuine code for activating a portable device
Implementation Method 2
an inversion transmission control unit that transmits, from an inversion transmission antenna with use of a carrier wave, an inversion code including at least partial inverted genuine code
Implementation Method 3
ensuring the portable device receives the genuine code without interference from radiation noise by crushing the pattern of the genuine code with the inversion code
Data Source
AI summary
A transmission control device, which drives multiple antennas having different transmission ranges, includes: a genuine transmission control unit that transmits, from a genuine transmission antenna with use of a carrier wave, a genuine code for activating a portable device; and an inversion transmission control unit that transmits, from an inversion transmission antenna with use of a carrier wave, an inversion code including at least partial inverted genuine code concurrently with a transmission of the genuine code from the genuine transmission antenna. The inversion transmission antenna has a transmission range which does not overlap with a transmission range of the genuine transmission antenna.