NXP 在藍牙科技聯盟（Bluetooth SIG） 還未公佈 Channel Sounding 這項技術前幾年就已在合作這項技術, 故才會在 KW45 BLE5.3 就已可使用此技術供前期開發者評估測距( Ranging )功能, 此技術與以往使用 BLE RSSI 與配合各公司 KNOW-HOW 的演算法技術建置有所不同, 上述的演算法僅於 local 端能進行對 Key fob 的場景應用，但於 Channel Sounding 技術將省去了 Key fob device 的成本效益, 還可於現代人 人手一機的 Smart Phone 比例上與 BLE6 Device 直接對傳 Ranging ,此後續的效益與新穎性特色將會是發熱在 BLE 6 ,而 NXP KW47 支援 BLE6 的規格與 KW45 HVQF48為 pin to pin 架構, 於現階段已可申請 engineering sample 進行開發。BLE SIG 對這項技術深具信心, 故於官網上標示了 10 cm Ranging Accuracy for Secure Access , Digital Key, and Proximity Services。
Channel Sounding參考網址: https://www.bluetooth.com/blog/bluetooth-channel-sounding-a-step-towards-10-cm-ranging-accuracy-for-secure-access-digital-key-and-proximity-services/
NXP 推廣 Two-Wheeler Connected Digital Cluster 的架構於 KW45/KW47 能讓選用IC者, 參考此結合儀表板應用場景架構, 理解使用BLE SIG新技術 Ranging 的價值, NXP 將此 Solution的架設已完成並可現場做演示, 快速使開發者容易上手與理解。
- https://www.nxp.com/applications/automotive/infotainment/two-wheeler-connected-digital-cluster-:TWO-WHEELER-CDC
- https://www.nxp.com/company/blog/nxp-revs-up-digital-cluster-reference-platform-for-two-wheel-vehicles:BL-TWO-WHEEL-VEHICLES
NXP BLE KW 於 CCC Digital Key with Channel Sounding 建置了下方的技術
- Owner Pairing between a Device and a Car Anchor
- Passive Entry
- Synchronizing bonding data between Car Anchors
- Connection between a Car Anchor and a non-CCC key fob
The two demo applications showcase the following localization features:
- Distance measurement through Channel Sounding
- RAS preliminary implementation based on specification working draft
- Distance measurement data transfer through RAS
- Ranging algorithms
– Complex-domain Distance Estimation (CDE)
– Rapid Accurate Distance Estimator (RADE)
NXP KW47 (BLE6) , 支援 MCAL & CDD Driver 與 Third party合作AUTOSAR , 核心有效加速 Ranging 時間比 KW45 性能更好, 目前於 NXP reference design 已有參考的 單天線與雙天線架構。 於 WPI 已有正在運作的 KW45/KW47 module partner 供給無 RF 開發經驗的公司選用,有需求皆可透過下方 mail 聯繫
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