AWR1642BOOST: range

Naveen kanta

Part Number: AWR1642BOOST

hello ,

To cover 1 km of distance by using sampling frequency 250 MHz , what should be slope rate and IF bandwidth . Please guide me with smart explanation (with equations), your all response is very valuable for me .

over 6 years ago

0 Cesar over 6 years ago

TI__Guru*** 149044 points

Hi,

Please use the mmwave Sensing Estimator to derive a chirp configuration based on requirements.

Thank you

Cesar

0 Kyle Cousino over 6 years ago

TI__Mastermind 24955 points

Naveen,

TI has not tested the AWR1642BOOST EVM in a standalone radar sensor configuration for a 1 km range. The maximum range TI has tested is about 120 meters which can be seen in our Short Range Radar (SRR) lab found in the automotive toolbox in TI's Resource Explorer.

This sensor does not support a sampling frequency of 250 MHz. The max IF bandwidth is specified in this whitepaper: http://www.ti.com/lit/an/swra553/swra553.pdf

You can also use the mmWave Sensing Estimator Tool to determine your chirp configurations. It appears that a 1 km range is theoretically possible but this kind of chirp profile has not been tested.

Regards,
Kyle

0 Naveen kanta over 6 years ago in reply to Kyle Cousino

Expert 1020 points

Respected ,

I understood the point that you made, but there is some issues related to calculation. As in the tutorials of TI telling that the chirp is having sweep bandwidth of 4GHz in 40us which corresponds to slope of 100MHz/1us. By this when i was trying to calculate IF frequency by using formula IF_frequency = (slope *2*range) /c , where range is 120 mts . After calculating , IF frequency = 80 MHz which is greater than the 5MHz ( IF bandwidth ). You suggested me to calculate chirp parameters by below link

https://dev.ti.com/gallery/view/1792614/mmWaveSensingEstimator/ver/1.3.0/

I tried to calculate, where it is showing bandwidth 370.55 MHz and chirp repetition time 54us which corresponds to slope of 6.8519 MHz/ 1us. when i calculated IF frequency with this values i got 5.23 MHz . if this is correct tell me that how can it give 4 cm range resolution which is written in all documents that TI have, with 370.55 MHz it is only possible to give 40 cm not 4 cm . Please clear my doubt as quick as possible .Thank you.

0 Cesar over 6 years ago in reply to Naveen kanta

TI__Guru*** 149044 points

The computation of range resolution has been extensively discussed in the forum.

Please see

http://e2e.ti.com/support/sensors/f/1023/t/792204?IWR6843-Range-resolution-of-this-device-

0 Kyle Cousino over 6 years ago in reply to Cesar

TI__Mastermind 24955 points

Naveen,

Please refer back to the whitepaper that I listed in my previous post to find more information about how we arrive at a best range resolution of 4 cm.

Regards,

Kyle

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AWR1642BOOST: range