IWR6843AOPEVM: Regarding ros driver terminology

Morten Nissov

Part Number: IWR6843AOPEVM

I am curious to the meaning of the "PRI" parameter in the ros driver. The calculation presented is

float PRI = (idleTime + rampEndTime) * 1e-6;

From the sdk, particularly this image:

I've come to the conclusion that this must be the "chirp cycle time", as this image illustrates the total "chirp cycle time" as consisting of "idle time" and "ramp end time". But then I am unaware of the acronym "PRI", and have been unable to find it used anywhere else.

over 2 years ago

+1 Pedrhom Nafisi over 2 years ago

TI__Genius 17927 points

Hello,

PRI stand for "Pulse Repetition Interval" and by definition is the time interval between pulses. In terms of the SDK image you provided, the PRI is the time between the Frequency Start point of a chirp, to the Frequency Start point of the next chirp. For this reason we are adding together the Ramp End Time and Idle Time which will give the duration between two Frequency Start points. This time is also in microseconds hence the multiplication of 1e-6.

Best Regards,

Pedrhom Nafisi

0 Morten Nissov over 2 years ago in reply to Pedrhom Nafisi

Intellectual 380 points

Ok so it is the same as "chirp cycle time", as illustrated in the figure?

0 Pedrhom Nafisi over 2 years ago in reply to Morten Nissov

TI__Genius 17927 points

That is correct.

Best Regards,

Pedrhom Nafisi

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IWR6843AOPEVM: Regarding ros driver terminology