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IWR1443BOOST: Vital Signs Radar Parameters

Jessica Bilskie
Prodigy 20 points
Part Number: IWR1443BOOST

A few questions regarding the IWR1443BOOST Radar Parameters suggested for vital sign detection in the document at this link: https://www.compel.ru/wordpress/wp-content/uploads/2018/04/mmwave-tehnologiya-iskusstvennogo---zreniya---dlya-promyishlennyih-i-ohrannyih-sistem.pdf

  1. For the vital signs application, are there any benefits for having a lower sampling rate? It is suggested to use 2MHz ADC sampling rate, which is the hard lower limit in mmWave Studio for that parameter. Is it simply set to 2MHz because that sampling rate is adequate and so you might as well collect less data with that lower sampling rate?
  2. For an application similar to vital sign detection, we are experiencing poorer performance (lower SNR in our micro Doppler plots) at low and high pulse repetition intervals. We get the best performance when the pulse repetition interval (PRI) is such that the PRI*NumberOfChirpsPerFrame is approximately equal to the desired frame length of the STFT for our specific application. Is this due to the fact that frames are not sent at 100% duty cycle so having the PRI*NumberOfChirpsPerFrame be similar to the desired STFT frame length allows for more accurate FFT calculations?
  3. We are also getting better performance (higher SNR in our micro Doppler plots) when we use a larger chirp slope; why might that be? Regarding this question. we are keeping the ADC sample rate, number of samples per chirp, pulse repetition interval, and bandwidth the same. Only the duration of the ramp end time and idle time are modified, although the sum of the two is kept the same.

Any insight is greatly appreciated.

Thanks.