ISP1907 IQ data

RE: ISP1907 IQ data

Simonr — Wed, 14 Aug 2024 11:16:36 GMT

So these parameters are from a proprietary solution we used for a demo multiple years ago, and the parameters are: sample number, I data, Q data, elevation angles, and azimuth angles (I think in that order).

Best regards,

Simon

RE: ISP1907 IQ data

skzpvls26 — Tue, 13 Aug 2024 13:41:54 GMT

hello,

That was from official Insight-SiP page 13

https://www.insightsip.com/fichiers_insightsip/pdf/ble/ISP1907/isp_aoa_AN210401.pdf

Thanks

RE: ISP1907 IQ data

Simonr — Tue, 13 Aug 2024 11:44:22 GMT

What sample is this IQ data gotten from exactly?

Best regards,

Simon

RE: ISP1907 IQ data

skzpvls26 — Mon, 12 Aug 2024 12:44:50 GMT

Thank you for your reply.!

One more thing about the raw IQ data from ISP1907.

I see that there are 5 components in one IQ,

I see here that the first two may indicate some index,

What is the number displayed here ? are they related to the I Q and maybe RSSI data.?

Thank you

RE: ISP1907 IQ data

Simonr — Mon, 12 Aug 2024 07:43:03 GMT

The kit will only output raw IQ data, so the phase must be calculated and then translate the IQ data correctly. Unfortunately I don't have more than the already provided links on this.

Best regards,

Simon

RE: ISP1907 IQ data

skzpvls26 — Fri, 09 Aug 2024 13:50:03 GMT

Hi Simonr

Thank you for your detailed answer. We really appreciate that.

In simple way of having two antenas to calculate AoA, the phase for an antena can be calculated through the first equation below.

Then the phase different between two antenas can be calculated through the second. The phase different can also be obtained if we have AoA information ( theta).

If we know the phase different, then we can calculate the AoA accordingly as

Here, I am particularly curious about which one is provided by the kit .?
does it give the IQ data for each antenna, phi, phase different, or theta.? or does the kit calculate the AoA in different way.?

Thank you very much.

RE: ISP1907 IQ data

Simonr — Fri, 09 Aug 2024 13:10:00 GMT

Unfortunately converting the raw IQ data to usable form will be beyond what our solution provide, as we only provide the HW and the AOA algorithm. The rest is expected that customers do themselves. The samples you can use for Direction Finding are the following from the nRF Connect SDK:

Raw IQ data must be converted into vector form to be reviewed properly. We don't have have any specific sample code showing this, but you can check out this page for information on the various formulas used to translate IQ data between polar and rectangular form. Please also see the Direction Finding whitepaper for more information.

Best regards,

Simon