u-blox XPLR-AOA-3, User Manual

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3.2 ANT-B10 configuration and testing
A green LED light indicates that the board is powered on.
Having connected the COM port, the board is ready to receive AT commands. For information about
the AT commands to use for configuring direction finding, see the u-connectLocate AT commands
manual
[18] .
s-center supports specific direction-finding AT commands in the AoA tab, as shown in Figure 7 . The
COM port can also be configured as a terminal for use with AT commands.
Once the system is setup, each anchor reports angle calculation events (
+UUDF
) over the serial port
connection. ANT-B10 returns events similar to the following when it detects a beacon:
+UUDF:CCF9578E0D8A,-42, 20 ,0,0 ,37,”CCF9578E0D8 9 ”,”” ,15869,23
+UUDF:CCF9578E0D8B,-41, 10 ,4,0 ,38,”CCF9578E0D89”,”” ,15892,24
+UUDF:CCF9578E0D8A,-42, -10 ,2,0 ,39,”CCF9578E0D89”,”” ,15921,25
…
The data reported in these events can be used to estimate a position of the tracked beacon. The
parameters of the
+UUDF
event are (in order from left to right):
• Eddystone instance ID
• RSSI of 1 st polarization
• Azimuth angle
•
Elevation angle
• Reserved
• Detected advertising channel, that is, one of the normal Bluetooth Low Energy advertisement
channels (37, 38 or 39)
• Anchor ID as set by
AT+UDFCFG
tag 4.
• User defined strings as set by
AT+UDFCFG
tag 2.
• Timestamp
• Periodic advertising sequence number
For a detailed description of the
+UUDF
event parameters, see the u-connectLocate AT commands
manual [18] .
In the angle calculation events shown above, the beacon is moving from one side of the anchor to the
other as the azimuth angle. Given as the third parameter in the command (shown in bold), the beacon
moves from a positive value (20) to a negative value (-10).
☞
The optimal distance between anchor nodes and tags is approximately 2 – 15 m.