Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

Radar sensor Forum Discussions

InfinityChips
Level 1
First like received First reply posted First question asked
Level 1

Hello,

 I’ve been looking at the documentation surrounding the BGT24LTR11 for use as a doppler  speed sensor. 

in the product application literature it says “suitable for speeds up to 100km/h”. In the datasheet I can’t find a specification for max speed or even IQ bandwidth which I guess is the limiting factor. 

If the Doppler formula in the application note is used and the Tx is as low as possible (24.05GHz) and shifted Rx as high as possible (24.25GHz) then it would represent ~1.5 million m/s (assuming I could sample high enough).

I understand that the dev kit might have a lower limit due to baseband filtering and DSP/ADC sampling speed, but not the chip itself. 

Is there a limit in the spec that I’m missing or not understanding?

Thanks!

0 Likes
1 Solution
GeorgeT
Moderator
Moderator 25 solutions authored 10 likes received 50 replies posted
Moderator

Hello @InfinityChips,

Please refer to below threads  related to similar topic. 

https://community.infineon.com/t5/Radar-sensor/Technical-recommendations-for-24GHz-radar-sensor-that...

https://community.infineon.com/t5/Radar-sensor/Doppler-radar-sensor/td-p/343330

As already mentioned  24 GHz radars are designed and tested for human target (RCS) detection and they are not tested for such high velocities. 

Yes you are right that higher sampling frequency enables higher velocity measurement as seen in the application note. Customizing the analog baseband and the firmware enables the measurement of such high velocities, but it is not tested.

Thanks and regards,

George

View solution in original post

0 Likes
2 Replies
GeorgeT
Moderator
Moderator 25 solutions authored 10 likes received 50 replies posted
Moderator

Hello @InfinityChips,

Please refer to below threads  related to similar topic. 

https://community.infineon.com/t5/Radar-sensor/Technical-recommendations-for-24GHz-radar-sensor-that...

https://community.infineon.com/t5/Radar-sensor/Doppler-radar-sensor/td-p/343330

As already mentioned  24 GHz radars are designed and tested for human target (RCS) detection and they are not tested for such high velocities. 

Yes you are right that higher sampling frequency enables higher velocity measurement as seen in the application note. Customizing the analog baseband and the firmware enables the measurement of such high velocities, but it is not tested.

Thanks and regards,

George

0 Likes
InfinityChips
Level 1
First like received First reply posted First question asked
Level 1

Thank you George. All understood.