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Usage of millimetre wave radar modules.

Neil Salmon
Prodigy 70 points

I'm looking for a single channel transmit and receiver mm-wave radar module 77 GHz of 60 GHz. I'm interested if the TI radar modules be used as a stepped frequency(SF) CW radar. It's clear that they operate as FMCW with a continual sweep, but can they be operated in a stepped frequency mode? In the stepped frequency(SF) mode, the frequency of the radar is changed in discrete steps. At each step the radar has a fixed frequency and a short time is made for the system to settle. Then a measuremnet of phase and amplitude is made (or I & Q if you like), before moving to the next frequency. However, for the system to be used as a SFCW radar the signal paths all the way to the ADCs have to be DC coupled. In standard FMCW systems AC coupling is normally used. So the question to you is can they be operated as a SFCW radar with a DC signal coupling to the ADCs? many thanks, Neil Salmon

  • 0
    TI__Mastermind 23725 points

    Hello

    TI's mmwave sensors are intended for FMCW applications based on the specified features in device data sheets.

    You may want to try and execute a series of consecutive chirps with 0 slop values to achieve similar enough effect, however the device base band processing and examples provided are based on FMCW only.

    Thank you,

    Vaibhav

  • 0 in reply to Vaibhav Mahimkar
    Prodigy 70 points

    Dear Vaibhav,

    Do the TI radar modules have any capability for radiometric measurement? I'm trying to access the maximum usability of the TI modules. So a question arising is, can you turn off the transmitter, or turn the transmit power down to very low levels so you can measured the radiometric emission from the environment. To do this you would need to bring the RF or IF gain up to quite a high level to measured this emission. Would this be possible with the TI modules.

    I ask this because there may be some mode of use where it would be attractive to make an active measurement of an object, then to make a passive or radiometric measurement of the object.

    many thanks,

    Neil

  • 0 in reply to Neil Salmon
    TI__Mastermind 23725 points

    Hello

    Current generation of devices have the capability to  Turn off transmitters, , however the rest of signal chain processing on receiver side is created for FMCW processing.

    Please take a look at Device Data sheet for the signal chain diagram.

    These devices are not intended for the use case scenarios you have mentioned.

    Regards,

    Vaibhav