Murata 2AB PdoA

Wireless Connectivity Ultra-Wideband
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1

Hi everyone,
i have some problem with this type of device. I try to obtain the degree angle from the PdoA example but with the correction formula that i found here in the other page of the forum i don’t obtain correct values (for example I obtain what i think is the correct value*2 for the interval +/-60° but in the interval +/-60° +/-90° the value remain constant).

This is my configuration:
static dwt_config_t config = {
5,
DWT_PLEN_128,
DWT_PAC8,
9,
9,
3,
DWT_BR_6M8,
DWT_PHRMODE_STD,
DWT_PHRRATE_STD,
(129 + 8 - 8),
(DWT_STS_MODE_1 | DWT_STS_MODE_SDC),
DWT_STS_LEN_256,
DWT_PDOA_M3
};

And this is the correction formula:
last_pdoa_val = (float)pdoa_val * 180 / (3.1415926 * 2048);
sprintf((char *)&pdoa_message_data, “%d”, last_pdoa_val);

Thx for the help

2

@Karma , which software are you using? Have you tried to use our latest software DW3_QM33_SDK_1.0.1, see here: New release of DW3000 and QM33 SDK: DW3_QM33 SDK v1.0.1?

3

Hi, i’m using a Murata type2AB nRF52840-DK platform. With SEGGER iflash the various example that i have found in the DW3XXX API (the package is the v9.3)

4

From myMurata i download this DW3xxx_QM33_XR6.0C - 1

5

@Karma , I would recommend to get the latest version of our software through the link from my previous post. We have made many improvements to the API as well as user experience in this latest SDK.

6

From my experience, PDOA is fine. But if you convert PDOA to AOA, there can be problems if you use channel 5.

7

Hi, i didn’t modify the code given by the producer. Do you suggest to switch channel?

8

Channel 9 would be fine.
It is mainly the antenna spacing thing. If you use Channel 9, the ratio (spacing / wavelength) is close to 0.45. For Channel 5 you need to recalculate that, and I’m not sure if there is anything else that may affect the AOA result.