BGT24LTR11 max doppler speed

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InfinityChips
Level 1
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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!

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George_T
Moderator
Moderator
Moderator
50 likes received First question asked 250 replies posted

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

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2 Replies
George_T
Moderator
Moderator
Moderator
50 likes received First question asked 250 replies posted

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

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Thank you George. All understood.