Direction finding with channels questions.

RE: Direction finding with channels questions.

Marcous — Fri, 07 Jan 2022 11:17:56 GMT

Thanks! Elfving, I found them in the code where I always ignored. Actually a silly problem lol, Thanks!

Best regards,

Marcous

RE: Direction finding with channels questions.

Elfving — Fri, 07 Jan 2022 10:13:25 GMT

Hello!

Ah right, that should be in the entire report along with the I/Q data itself. There is no data for calculating the angles in the report from the default sample. It has to be pulled out by the user.

Best regards,

Elfving

RE: Direction finding with channels questions.

Marcous — Fri, 07 Jan 2022 00:34:50 GMT

Thanks for your detailed answers, Elfving!

But I don't have any idea that which parameter in the UART data coming out indicates the channel in which the signal was transmitted? Here I copy slides of the UART information from the link https://devzone.nordicsemi.com/f/nordic-q-a/76558/direction_finding_connectionless_rx I believe the original UART information should be similar to this.

Starting Connectionless Locator Demo
Bluetooth initialization...success
Scan callbacks register...success.
Periodic Advertising callbacks register...success.
Start scanning...success
Waiting for periodic advertising...
[DEVICE]: 24:D4:13:1A:76:61 (random), AD evt type 5, Tx Pwr: 127, RSSI -43 DF Connectionless Beacon App C:0 S:0 D:0 SR:0 E:1 Prim: LE 1M, Secn: LE 2M, Interval: 0x0780 (2400 ms), SID: 0
success. Found periodic advertising.
Creating Periodic Advertising Sync...success.
Waiting for periodic sync...
[DEVICE]: 7F:D0:DA:D4:CB:A1 (random), AD evt type 0, Tx Pwr: 127, RSSI -68  C:1 S:1 D:0 SR:0 E:0 Prim: LE 1M, Secn: No packets, Interval: 0x0000 (0 ms), SID: 255
[DEVICE]: 7F:D0:DA:D4:CB:A1 (random), AD evt type 4, Tx Pwr: 127, RSSI -68  C:1 S:1 D:0 SR:1 E:0 Prim: LE 1M, Secn: No packets, Interval: 0x0000 (0 ms), SID: 255
PER_ADV_SYNC[0]: [DEVICE]: 24:D4:13:1A:76:61 (random) synced, Interval 0x0780 (2400 ms), PHY LE 2M
success. Periodic sync established.
Enable receiving of CTE...
success. CTE receive enabled.
Scan disable...Success.
Waiting for periodic sync lost...
PER_ADV_SYNC[0]: [DEVICE]: 24:D4:13:1A:76:61 (random), tx_power 127, RSSI -40, CTE AOA, data length 0, data: 
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -400
PER_ADV_SYNC[0]: [DEVICE]: 24:D4:13:1A:76:61 (random), tx_power 127, RSSI -41, CTE AOA, data length 0, data: 
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -410
PER_ADV_SYNC[0]: [DEVICE]: 24:D4:13:1A:76:61 (random), tx_power 127, RSSI -41, CTE AOA, data length 0, data: 
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -410
PER_ADV_SYNC[0]: [DEVICE]: 24:D4:13:1A:76:61 (random), tx_power 127, RSSI -43, CTE AOA, data length 0, data: 
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -430
PER_ADV_SYNC[0]: [DEVICE]: 24:D4:13:1A:76:61 (random), tx_power 127, RSSI -42, CTE AOA, data length 0, data: 
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -420

RE: Direction finding with channels questions.

Elfving — Tue, 04 Jan 2022 12:52:17 GMT

Hey again Marcous!

[quote user=""]From my understanding, since the signal is transmitted in the 2M PHY, the packets will be transmitted in the secondary channel indexed from 0~36 (37 38 39 is excluded) [/quote]

Acctually all 37 data channels are used for the periodic advertising unless you limit the channels.

[quote user=""]f so, how can I confirm which channel the signal is transmitted?[/quote]

All channels will be used following the Channel Selection Algorithm 2. Unless they are mapped out in the channel map. I believe our code returns the channel as a part of the report. You can check that in the UART data coming out.

[quote user=""]is it necessary for me to modify the different beacons with different channels to avoid disturbing? [/quote]

No I don't think that is necessary.

Best regards,

Elfving

RE: Direction finding with channels questions.

Elfving — Tue, 28 Dec 2021 15:16:10 GMT

Hey Marcous! And Merry Christmas!

I have to get back to you on this. We are a bit short staffed due to the holidays, and unfortunately you might have to expect limited support and slower responses from us

Best regards,

Elfving