【Bluetooth SIG-鲁公羽】 蓝牙信道探测技术概览.pdf

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1、Technical Overview of Bluetooth Channel SoundingGongyu LuTechnical Marketing EngineerBluetooth SIG,Inc Why Bluetooth Channel Sounding?Bluetooth Channel Sounding technical overview Reference materialsAgendaAccurate:Based on Phase-Based Ranging,a well-proven methodSecure:Multi-level security to mitiga

2、te wireless ranging attacksUbiquitous:Embedded in major consumer platform devicesWhy Bluetooth Channel Sounding?X centimetersDistanceEnables“centimeter-level”accuracyEarly implementations achieving+/-20 cm up to 100m Operation summary Ranging methods Bluetooth stack changes Key proceduresBluetooth C

3、hannel Sounding Technical Overview Security measures Ranging Profile and Service Distance measurement algorithms Resources for additional learning One-to-one topology between two Bluetooth devices Two Bluetooth Channel Sounding(CS)device rolesInitiator:Device wishing to calculate the distance to ano

4、ther Reflector:Device responding to the Initiator Application layer provides configuration choices and preferences that are suitable for the two devices using HCI commands CS procedures consist of signal exchanges that produce phase and time delay data Distance is calculated by a distance measuremen

5、t algorithm using data passed by the LE controller to the application layer in HCI eventsBluetooth Channel Sounding OperationFor High-accuracy Distance Measurements An Initiator device sends a signal to a Reflector device,which returns the signal The process is repeated across multiple frequencies D

6、istance between the devices is calculated based on the phase differences between the transmitted and received signals over those frequencies Distance ambiguity can be triggered at 150m.Phase-based Ranging*r is Two-way ranging,so the one-way distance should divide 2 Initiator For Secure Distance Boun