Re: DOA - gr-doa

Dear Kyeong,

Thank you for your reply.

I would like to clarify it. I want to use one X310 similar to the DOA example https://kb.ettus.com/Direction_Finding_with_the_USRP%E2%84%A2_X-Series_and_TwinRX%E2%84%A2. However our X310 includes two SBX daughterboards instead of TwinRX.

How would I do the below steps with one X310 usrp like in my case?

Thank you in advance.

Kind regards,

Ali

----------------------------------------------------------------------

Dr. Ali Mahbas

Department of Electronic and Electrical Engineering

College of Engineering, Design and Physical Sciences

Brunel University London

ali.mahbas@brunel.ac.uk

-----------------------------------------------------------------------

From: Kyeong Su Shin <ksshin@postech.ac.kr>
Sent: 14 February 2023 14:50
To: Ali Mahbas (Staff) <Ali.Mahbas@brunel.ac.uk>; Discuss-gnuradio@gnu.org <discuss-gnuradio@gnu.org>
Subject: Re: DOA - gr-doa

Hello Ali:

You will have to 1. sync their clocks, and then 2. compensate their phase offsets. You will need to have some kind of a clock source (can be pretty expensive).

See: https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices

You will also have to modify gr-doa, so as it would take multiple USRPs as input sources.

Regards,

Kyeong Su Shin

보낸 사람: Ali Mahbas (Staff) <Ali.Mahbas@brunel.ac.uk>
보낸 날짜: 2023년 2월 14일 화요일 오후 11:29
받는 사람: Kyeong Su Shin <ksshin@postech.ac.kr>
제목: Re: DOA - gr-doa

Dear Kyeong,

Thank you very much for your response.

KrakenSDR looks interesting. Unfortunatly it isn't an option now. Could you please provide me with more information/materials about the modifications required for using X310-SBX?

Kind regards,

Ali

From: Kyeong Su Shin <ksshin@postech.ac.kr>
Sent: 14 February 2023 13:55
To: Ali Mahbas (Staff) <Ali.Mahbas@brunel.ac.uk>; discuss-gnuradio@gnu.org <discuss-gnuradio@gnu.org>
Subject: Re: DOA - gr-doa

Hello Ali:

B210 does have suitable frontends, but you will only get 2 channels (instead of 4), and you will have to make some modifications to the software.

Other boards are also usuable, but you will have to synchronize them (using something like an Octoclock) and compensate their phase offsets manually (by using something like a noise generator). And again, you may have to make some modifications to the gr-doa software.

A cheaper (non-USRP) alternative to this is KrakenSDR ( https://www.crowdsupply.com/krakenrf/krakensdr ). You may want to stick with USRPs for academic purposes, though, if you can afford (as KrakenSDR is still at its infancy).

Regards,

Kyeong Su Shin

보낸 사람: Ali Mahbas (Staff) <Ali.Mahbas@brunel.ac.uk> 대신 discuss-gnuradio-bounces+ksshin=postech.ac.kr@gnu.org <discuss-gnuradio-bounces+ksshin=postech.ac.kr@gnu.org>
보낸 날짜: 2023년 2월 14일 화요일 오후 10:05
받는 사람: discuss-gnuradio@gnu.org <discuss-gnuradio@gnu.org>
제목: DOA - gr-doa

Dear all,

I need to do the angle of arrival by using USRP (gr-doa) and I know that this example requires X310-TwinRX. Unfortunately, I only have X310-SBX, B210 and N210-CBX. Would be possible to use any of these USRPs instead?

Any help would be much appreciated.

Thank you very much in advance.

Kind regards,

Ali

From:	Kyeong Su Shin
Subject:	Re: DOA - gr-doa
Date:	Wed, 15 Feb 2023 13:51:53 +0000