DCA1000EVM: Parsing data from range_azimuth heatmap data capture card

Song Yang

Prodigy 160 points

Part Number: DCA1000EVM
Other Parts Discussed in Thread: AWR1642, , IWR6843

Hi,

I am using AWR1642ODS and DCA1000EVM. I am facing a problem with parsing range_azimuth heatmap data. 2 Questions.

Question 1:

In the file swra581b.pdf page 9 :

"Because only two LVDS lanes are used, data capture using 3 receivers is not available with the xWR16xx/IWR6843. Only1, 2, and 4 enabled receivers can be used."

Is that means I am supposed to get 3 lines of data? Now I have the data captured by DCA1000EVM and formatted them to [rx_num, adc_samples * chip_num]. I activated 2 TX and 4 RX. I've already got the formatted data as I mentioned above.

swra581b.pdf

Queston2:

I'd like to plot range azimuth heatmap and range elevation heatmap from the raw ADC data.

Leaned from https://e2e.ti.com/support/sensors/f/1023/t/731822?IWR1642BOOST-How-to-use-Azimuth-Heat-TLV-data-to-plot-heat-map and other TI documents, I learned that the AWR1642ODS has 8 virtual antenna placement and we can use 4 of them to plot range_azimuth heatmap and 3 of them to plot range_elevation heatmap.

My question is, given the formatted data( with size -> [rx_num, adc_samples * chip_num]). How can i parse the data to [num_virtual_antenna, range_bin]. Page 5 on file swra555.pdf mentioned that AWR1642 mentioned that it is non-interleaved stored. so how can i split the data?

swra555.pdf

Thank you so much for your help!

Regards,

Song

over 5 years ago

0 Song Yang over 5 years ago

Prodigy 160 points

3580.swra581b.pdf 3007.swra555.pdf

0 Cesar over 5 years ago in reply to Song Yang

TI__Guru*** 149854 points

Question 1

Answer 1

No, this means that you can't capture data with 3RX. With 4RX should be no problem

Question 2

Answer 2

swra581b provides you information to be able to parse the captured data for each Rx. After you have this information you can perform any signal processing needed. I recommend you review the C source code provided with the obstacle detection demo to understand how the processing was performed.

Thank you

Cesar

0 Song Yang over 5 years ago in reply to Cesar

Prodigy 160 points

Thanks for clarifying. One additional question.

on the obstacle detection demo website the virtual antenna looks like this.

but in tidue83.pdf, they looks like this

Which is more convincing?

Bes,

Song

0 Cesar over 5 years ago in reply to Song Yang

TI__Guru*** 149854 points

The virtual antenna array on the demo website looks correct.

We will update the documentation tidue83.pdf in the next release

thank you
Cesar

0 Song Yang over 5 years ago in reply to Cesar

Prodigy 160 points

Thanks. In this case, since there are two columns w/multiple antennas, we can get 2 angle-range-elevation heatmaps. Similarly, we can get 4 angle-range-azimuth heatmaps because there are 4 rows w/multiple antennas?

Thanks,

Song

0 Cesar over 5 years ago

TI__Guru*** 149854 points

You can.

Thank you

Cesar

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DCA1000EVM: Parsing data from range_azimuth heatmap data capture card