【可分享版】Silicon Labs-使用蓝牙信道探测技术实现精准距离测量.pdf

1、Silicon Labs蓝牙信道探测蓝牙信道探测技术特色和应用方向技术特色和应用方向周耀军周耀军/David Zhou主任现场主任现场应用工程师应用工程师蓝牙信道探测概论蓝牙信道探测概论Channel Sounding OverviewChannel Sounding OverviewMeasure distance between two devices using Phase-based Ranging(PBR)Round Trip Time(RTT)RTT and PBR operates across 2.4 GHz band Standard specifies up to 72 c

2、hannels Random hopping pattern Connection-Oriented 2-way ranging with two roles Initiator:device that wishes to calculate distance from itself to another device Reflector:device responding to initiatorSupports up to 4 antenna paths between devices 8 possible antenna combinationsMultiple security fea

3、tures included in the standardCan be combined with Angle of Arrival/Departure(AoA/AoD)Enables position estimation with single initiator/reflector pairBluetooth SIG Specification adoption expected in 2024Draft Channel Sounding specification at:https:/ not included in the spec:Distance measurement alg

4、orithm recommendations and optimizationsWhats included in the spec:RF and link layer timing and functional requirementsMandatory vs.optional features and modesGuidance on antenna configurations and security featuresChannel Sounding Setup between Central&PeripheralNote:While this exchange occurs befo

5、re every channel sounding procedure start,some of these steps can be skipped during setup if information has been cached previouslyLE ACL encryption startDRBG secret exchange for randomized bit streamsDefine all possible antenna configs and supported modes/submodes,supported PHYs,and moreDefines ant

6、enna config,PHY,and who acts as initiator,with decisions based on capabilities exchange Channel Sounding Procedure-Events-Subevents-Steps Procedures,composed of events,can span multiple connection intervalsSubevents are required to complete within single connection intervalSteps correspond to setup,