Verification of the IQ data

RE: Verification of the IQ data

SwRa — Fri, 18 Oct 2024 14:22:29 GMT

[quote user="Darsh"]Does it mean to convert them into a complex form? [/quote]

Yes.. You need to use the formulas that I have stated in the previous reply..

[quote user="Darsh"]do i have to build an antenna model and do the calibration of the antenna? or is it already supported in the sample code for the nordic 12 patch antenna array?[/quote]

You will have to build the antenna model and make your own algorithm..

Regards,

Swathy

RE: Verification of the IQ data

Darsh — Mon, 14 Oct 2024 14:15:17 GMT

Also, one more, question , since i am using the design files of nordic 12 patch antenna array and the sample code of direction finding connectionless Rx flashed in nrf52833dk whcih is connected to the antenna array. do i have to build an antenna model and do the calibration of the antenna? or is it already supported in the sample code for the nordic 12 patch antenna array?

Thanks & Regards,

Darshan.

RE: Verification of the IQ data

Darsh — Mon, 14 Oct 2024 13:00:33 GMT

Hi Swathy,

what do you exactly mean by converting raw IQ data to its vector form? Does it mean to convert them into a complex form?

Regards,
Darshan.

RE: Verification of the IQ data

SwRa — Mon, 14 Oct 2024 12:56:09 GMT

Hi Darshan,

Sorry for not getting back to you sooner.. There is no point in looking at raw IQ data, as you always have to convert this data into a vector, and then examine this to get a useful positioning data. Some formulas for calculating with IQ signals translating between polar and rectangular forms can be found here: https://www.pe0sat.vgnet.nl/sdr/iq-data-explained/

Peak Amplitude A = (I²+Q²)½

Phase Angle ϕ = tan⁻¹(Q/I)

I = A⋅cos(ϕ)

Q = A⋅sin(ϕ)

Converting IQ Data to a plain signal: I is the original signal.

Euler form: A⋅eiϕ = A⋅(cos(ϕ) + i⋅sin(ϕ)) = I + Qi

Best Regards,

Swathy

RE: Verification of the IQ data

Darsh — Sat, 14 Sep 2024 00:53:42 GMT

Hi Swathy,

Thank you. I will be waiting for the reply.

Regards.

RE: Verification of the IQ data

SwRa — Fri, 13 Sep 2024 10:30:07 GMT

Hi Darshan,

I will look into it and get back to you.

Regards,

Swathy