AoA Locator For Indoor RTLS Personnel Tracking and Asset Positioning

DSGW-200 is an indoor Locator for Bluetooth AoA Positioning. It can reach a positioning accuracy of 0.3-1 meters in the 2D plane. At the same time, it has the characteristics of low power consumption, low delay, low radiation, and strong anti-interference.
Table of Contents

image 88


ModeWi-Fi 2.4G/5GAOALTE CatM1BLE5.2

1. Introduction

1.1 Purpose& Description

DSGW-200 is indoor Locator for Bluetooth AoA Positioning. It can reach a positioning accuracy of0.3-1 metersin the 2D plane. At the same time, it has the characteristics of low power consumption,low delay, low radiation and strong anti-interference. A signal locator can achieve 2D positioning.DSGW-200 is suitable for personnel tracking and real-time positioning of assets in smarthealthcare, smart factories, smart factories, smart offices, and smart education.DSGW-200 also have IoT gateway function, it support the Zigbee, Z-wave, BLE wireless protocol.

1.2 Product Feature Summary

·  Support 5V USB type-c power supply
·  Support IEEE802.3-2012 Type 1, the IEEE802.3-2012 Type 1 requires a power supply device
(PSE) to provide 44 to 57V, and the power of the powered device (PD) must not exceed 12.95W and the current does not exceed 350 mA.
·  Support IEEE802.11ac, IEEE802.11a, IEEE802.11n, IEEE802.11g, IEEE 802.11b Protocol
·  Support AoA Antenna array
·  Support Bluetooth 5.2
·  One WAN/LAN variable network port

1.3 Hardware block diagram

2. Mechanical Requirement

2.1 Drawings
image4 1
2.2 Size

3. Specifications

3.1 Technical Specification
Power SupplyUSB type-C 5V/3A
Reset buttonThe reset button is hole button, After pressing the reset button for more
than 5 seconds, the Locator will be restored to the factory settings.
Network InterfaceThe network interface supports CAT-5/CAT-5E to transmit data and
POE Power Supply (voltage range is 44~ 57V).WAN*1
Indicator LEDs1).Power &battery LED 2). BLE LED 3).Wi-Fi LED 4)LTE   indicator
Antenna array direction finding4*4 Antenna Array
Installation methodCeiling, Wall mounting
RTCReal Time Clock operated from on board battery
Operating Temperature-10℃~60℃
Storage Temperature-40℃~85℃
Operating humidity10%~90%
CoolingHeat dissipation silicone/aluminum
positioning accuracy0.3-1 meter
Detect range360° array antenna, Angle of Arrival measurement in the 2.4GHz   band

3.2 Performance Requirement

Wi-Fi Performance· IEEE wireless LAN standard:
IEEE802.11ac; IEEE802.11a; IEEE802.11n; IEEE802.11g; IEEE 802.11b l
· Data Rate:
IEEE 802.11b Standard Mode:1,2,5.5,11Mbps
IEEE 802.11g Standard Mode:6,9,12,18,24,36,48,54 Mbps
IEEE 802.11n: MCS0~MCS7 @ HT20/ 2.4GHz band
MCS0~MCS7 @ HT40/ 2.4GHz band
MCS0~MCS9 @ HT40/ 5GHz band
IEEE 802.11ac: MCS0~MCS9 @ VHT80/ 5GHz band

· Sensitivity:
VHT80 MCS9 : -60dBm@10% PER(MCS9) /5GHz band
HT40 MCS9 : -63dBm@10% PER(MCS9) /5GHz band
HT40 MCS7 : -70dBm@10% PER(MCS7) /2.4GHz band
HT20 MCS7 : -71dBm@10% PER(MCS7) /2.4GHz band

· Transmit Power:
IEEE 802.11ac: 13dBm @HT80 MCS9 /5GHz band
IEEE 802.11ac: 16dBm @HT80 MCS0 /5GHz band
IEEE 802.11n: 14dBm @HT20/40 MCS7 /5GHz band
IEEE 802.11n: 16dBm @HT20/40 MCS0 /5GHz band
IEEE 802.11n: 16dBm @HT20/40 MCS7 /2.4GHz band
IEEE 802.11g: 16dBm @54MHz
IEEE 802.11b: 18dBm @11MHz
· Wireless Security: WPA/WPA2, WEP, TKIP, and AES
· Working mode: Bridge, Gateway, AP Client
· Range: 50 meters minimum, open field
· Transmit Power:17dBm
· Highest Transmission Rate: 300Mbps
· Frequency offset: +/- 50KHZ
· Frequency Range (MHz): 2412.0~2483.5
· Low Frequency (MHz):2400
· High Frequency (MHz):2483.5
· E.i.r.p (Equivalent Isotopically Radiated power) (mW)<100mW
· Bandwidth (MHz):20MHz/40MHz
· TX Power:   19.5dBm
     · Range: 150 meters minimum, open filed
     · Receiving   Sensibility: [email protected]%BER
     · Frequency offset:   +/-20KHZ
     · Frequency Range   (MHz):2401.0~2483.5
     · Low Frequency   (MHz):2400
     · High Frequency   (MHz):2483.5
     · E.i.r.p (Equivalent Isotopically Radiated   power) (mW)<10mW
     · Bandwidth   (MHz):2MHz
     · Modulation:   GFSK
WAN/LAN10/100M bps

4. QA Requirements

4.1 Quality and Testing Information
Information DescriptionStandard(Yes) custom(No)
ESD TestingYes
RF Antenna AnalysisYes
Environmental TestingYes
Reliability TestingYes
CertificationFCC, CE, Bluetooth(BQB), PTCRB, RoHs

5. Application

The gateway has an array antenna, the beacon sends Bluetooth data, and the gateway can receive or send Bluetooth signals when switching between different antennas.


Antenna array design


Angle of arrival operation

Measure and detect the phase difference of the Bluetooth signal between different receiving antennas,and then calculate the angle of arrival of the signal based on this information and the known distance between the different antennas.


Derive AoA from the phase difference of different antenna signals

AoA technology only provides relative azimuth and/or elevation angle data between the sending and receiving devices, and other information is needed to calculate the absolute X, Y, and Z coordinates of the Bluetooth asset tag. Figure shows the mechanism to achieve this calculation. In this example, the receiver coordinates and direction are known, and AoA is used to derive azimuth and elevation data from the Bluetooth asset tag.


Determine the X, Y, and Z coordinates of the Bluetooth asset tag from the known location of the Bluetooth receiver and the azimuth and elevation information generated by AoA

There are other ways to calculate the X, Y, and Z coordinates of the tracked device, such as using multiple receivers to detect the signal sent by the asset tag, and then using triangulation or trilateral measurement to
calculate the asset location.

System structure
image 91 1

6. I/Q data

Elevation, RSSI, Azimuth, Distance

image21 1

7. Signal Gateway - Two Dimensional Locating

A single gateway calculates and obtains the actual heading angle/pitch angle of the tag, and obtains a uniqueray. According to the determined tag height, a single gateway can calculate and obtain a unique spatial absolute coordinate.


Coverage depends on your installation height, Angle α maximum value:
Height =h , α= 60℃ ,Coverage r= h*tagα ≈2h

8. Multiple gateways - Large Area

The strap-down combination of multiple gateways obtains a larger positioning coverage space, and multiple anchor course angel calculations improve the global spatial accuracy level.


As follows

image24 1

9. Beacons

Using Nordic beacons, the beacon broadcast frequency is 1s, and the maximum number is 50
Using silicon labs beacons, there is an enhanced method, which can support up to 1000 beacons

10. Application scenarios

•  Real-time tracking of the elderly and children
•  Product tracking
•  Tool management
•  Indoor navigation
•  Asset positioning


DusunIoT offers full set of development resources including QUICK START, SDK, Firmware packaging, module firmware, Tools, vairous third party software,etc.

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