QM33120WDK1 PDoA angle value is faulty

Ultra-Wideband
1

how does QM33120WDK1 PDoA calculation work?

5m_60
5m_601400×327 103 KB

It will be very helpful to explain based on the code.
I am using the code below.

SW Download link : QM33120WDK1 - Qorvo

  • Documents > [QM33 DK Software, Sources, Tools and Developer Guide]

Project Directory : QM33 DK Software, Sources, Tools and Developer Guide/QM33120WDK1/DW3_QM33_SDK/Sources/nRF52840DK-DW3_QM33_SDK-FreeRTOS_DW3_QM33_SDK_0_1_1/nRF52840DK-DW3_QM33_SDK-FreeRTOS/Projects/DW3_QM33_SDK/FreeRTOS/nRF52840DK/sesnRF52840DK-DW3_QM33_SDK_CLI-FreeRTOS.emProject

p.s. AoA angle result looks okay.

2

p.s. AoA angle result looks okay except at +90 degree which is the situation placing the tag at the right.
It will be very thankful if someone can explain this too.

qm_aoa
qm_aoa760×358 6.41 KB

3

Hello,

Can you help us understand why you think the “PDoA angle value is faulty”?

Here is a video from FiRa that explains how AoA works from PDoA: https://www.youtube.com/watch?v=5k938MZiHXY

Essentially there is a look-up table (LuT) which converts the PDoA to AoA. This LuT is unique for each antenna depending on the antenna element spacing and properties.

+90 degrees angle is at the area where we would expect PDoA wrapping and aliasing. At this angle, the PDoA value might be around +180 which is aliased to -180 and therefore, we cannot discern if the measurement is coming from +90 or -90 and hence, you have nearly the same results in your +90 and -90 angles.

Generally, the field of view where we have good results is around +/- 60 degrees as the PDoA to AoA curve is not linear but rather more like a sigmoid.

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