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## BGT60TR13C: Max Speed

Level 1
Level 1

Hello,

I am wondering how max speed is calculated. I tried looking through SDK but it seems the value is hard-coded. I also tried looking at some documentation but that did not help. I thought the max speed would be

Max_speed = lambda/(2*Tc), but I get wrong values.

I am using the "chirp time" for Tc.

When I try "Chirp Repetition Time" the values seem to make more sense but are still off. GUI will show -12.3 to 12.3, but I calculate -14 to 14.

I thought "chirp repetition time: would make more sense because it would be the total chirp time, but I am assuming that it is t_prt. I included image below.

Any help is greatly appreciated. Thank you.

- amee

1 Solution

## Re: BGT60TR13C: Max Speed

Moderator
Moderator

Hello @AMEE23,

wavelength (lambda) = speed of light (m/s)/ center frequency (Hz)
center frequency = (lower frequency + higher frequency)/2

Best Regards,
Pugitha
3 Replies

## Re: BGT60TR13C: Max Speed

Moderator
Moderator

Hello @AMEE23,

Max speed = lambda / 4*PRT(pulse repetition time). That is how it is computed in SDK. Please refer to Introduction to radar section in Radar SDK Documentation. Document is available in radar_sdk directory of RDK package.

Yes, it is tprt from the chirp diagram.

Best Regards,

Pugitha.

## Re: BGT60TR13C: Max Speed

Level 1
Level 1

@Pugitha_N  thank you for taking the time to reply. Can you please specify if lambda is the wavelength of the lower frequency? Thank you so much for taking the time to respond.

-amee

## Re: BGT60TR13C: Max Speed

Moderator
Moderator

Hello @AMEE23,

wavelength (lambda) = speed of light (m/s)/ center frequency (Hz)
center frequency = (lower frequency + higher frequency)/2

Best Regards,
Pugitha