BLE Vehicle Localization via Dynamic RSSI Normalization
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Solution Overview
Problem
Existing methods for locating a user terminal with respect to a motor vehicle, such as those using low frequency or ultra-wide band signals, are not standard on smartphones, requiring additional device installation and transformation, and face challenges in precision due to dispersion of power measurements across different frequency channels.
Innovation Solution
A method utilizing Bluetooth Low Energy (BLE) communication protocol with multiple electronic units broadcasting announcement frames on distinct channels, incorporating primary and secondary identification information, and dynamic normalization of reception power measurements to determine the user terminal's distance and position relative to the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-frequency or ultra-wide band signals are used for location, then location capability is achieved, but additional device installation and transformation are required on smartphones
Solution Approach 1:
The patent leverages the smartphone's existing BLE capabilities to perform location functions independently, without requiring additional hardware installation or transformation. The smartphone uses its built-in BLE radio to communicate with electronic units in the vehicle, making the system self-sufficient and eliminating the need for external devices.
Solution Approach 2:
The patent utilizes Bluetooth Low Energy (BLE), a universal communication protocol already widely integrated into smartphones for other purposes. By repurposing this existing multi-functional technology for location determination, the system avoids the need for specialized hardware while maintaining reliable location capability.
2Quantity of substance
If power measurements are taken across multiple advertisement channels, then comprehensive signal data is collected, but measurement precision decreases due to dispersion
Solution Approach 1:
The patent introduces a reference advertisement channel as an intermediary baseline for comparison. By measuring the received power on this reference channel and using it to normalize measurements from other channels, the system compensates for channel-specific variations and achieves consistent, precise location calculations across all channels.
Solution Approach 2:
The patent dynamically adjusts the received power measurements by applying a compensation value derived from reference channel measurements. This parameter transformation normalizes the data across different advertisement channels, eliminating dispersion effects and enabling precise location determination despite using multiple channels for comprehensive signal collection.
Data Source
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AI summary
The present invention relates to a method for localizing (P) a user terminal (SP) relative to a motor vehicle (V) comprising a plurality of electronic units (BA, PE), said user terminal (SP) and the electronic units (BA, PE) being adapted to communicate according to a Bluetooth Low Energy™ (BLE) communication protocol, according to which said localization method (P) comprises: - a broadcast by each electronic unit (BA, PE) of a plurality of advertisement frames (ADV) within at least two advertisement channels (CA), each broadcast advertisement frame (ADV) comprising a primary identification information (FLG1) of an electronic unit (BA, PE); - a scan of said at least two advertisement channels (CA) by said user terminal (SP) to receive said broadcast advertisement frames (ADV); - a memorization of said advertisement frames (ADV) by said user terminal (SP) according to said primary identification information (FLG1);- a measurement of the received power (RSSI) by said user terminal (SP) of said stored advertisement frames (ADV); - for each electronic unit (BA, PE), a determination of the distance (D) at which said user terminal (SP) is located from the motor vehicle (V) as a function of said received power (RSSI) measurements; - a calculation of the position (POS) of the user terminal (SP) relative to the motor vehicle (V) as a function of the distances (D) determined for each electronic unit (BA, PE).