Vehicle Keyless Entry Distance Sensing With Two-Way RSSI
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Solution Overview
Problem
Existing distance determination methods for vehicles, which rely on single RSSI measurements, often fail to accurately determine the position and distance of a remote device, leading to inaccurate locking/unlocking of vehicles.
Innovation Solution
A method that utilizes two-way RSSI detection between a remote device and a communication module attached to a vehicle, involving calibration and averaging of RSSI signals to accurately determine the motion direction and distance, enabling precise automatic locking/unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single RSSI measurement method is used, then device complexity is reduced, but distance determination precision deteriorates
Solution Approach 1:
The patent combines RSSI measurements from both the vehicle side and the key side to determine distance. Instead of relying on a single RSSI measurement from one direction, the system merges measurements from both communicating parties, using averaging or selection of the smaller distance value to achieve more accurate and reliable distance determination.
Solution Approach 2:
The system implements feedback by having both the vehicle and the key independently measure RSSI and exchange distance information. Each side provides feedback to the other about their measured distance, allowing for cross-validation and correction of distance determination errors through iterative comparison and adjustment.
2Measurement precision
If two-way RSSI detection is implemented, then distance determination precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the distance determination process into two independent measurement tasks: one performed by the vehicle measuring RSSI from the key, and another performed by the key measuring RSSI from the vehicle. Each device independently performs its measurement and calculation, then exchanges results for final determination, dividing the complex task into manageable segments.
Solution Approach 2:
Both the vehicle and the key autonomously perform RSSI measurement, distance calculation, and result exchange without requiring external assistance. Each device serves itself by independently completing the measurement and computation tasks, reducing the need for complex centralized control systems.
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 approach ensures accurate determination of the distance between the remote device and the vehicle, enhancing the reliability of automatic locking/unlocking processes.
Implementation Method 1
detecting a first received signal strength indicator (RSSI) of a first electronic device by a second electronic device; detecting a second RSSI of the second electronic device by the first electronic device
Data Source
AI summary
A distance determination method has: detecting a first received signal strength indicator (RSSI) of a first electronic device by a second electronic device; detecting a second RSSI of the second electronic device by the first electronic device; obtaining the first RSSI from the second electronic device by the first electronic device; and calculating a motion direction and a distance of the second electronic device relative to the first electronic device according to the first RSSI and the second RSSI by the first electronic device.