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IWR1843: I'm currently using the MRR Beamforming Demo to measure distant targets with an IWR1843 radar. How can I modify the code to improve the ranging resolution?

Henrry
Prodigy 60 points
Part Number: IWR1843

Tool/software:

The radar's application scenario is within 100m, and I want the radar to measure distances far enough and with the smallest possible resolution (centimeter-level). Can this be achieved by modifying chirp parameters? I found in the manual that the MRR resolution is 0.7m, how was this data obtained?

I've understood that the distance resolution formula is res=2Rres​=2Bc​, isn't B fixed at 4 GHz? Thanks for clarifying.

  • 0
    Prodigy 60 points

    Hello,

    I understand that modifying the chirp configuration can improve distance resolution. In the MRR example, can my desired effect be achieved by simply modifying the chirp configuration?

    I made the following design:

    • Start Frequency: 77.175776 GHz
    • Idle Time: 7 µs
    • TX Start Time: 1 µs
    • ADC Start Time: 4.8 µs
    • Ramp End Time: 44.78 µs
    • Slope: 36.62 MHz/µs
    • ADC Samples: 1024
    • Sample Rate: 25 Msps
    • ADC Sample Time: 40.96 µs
    • Chirp Time (Tc): 51.78 µs
    • Bandwidth: 1.4999552 GHz

    Can this configuration achieve my expected results in terms of distance resolution?

    Thank you very much for your help!

    Best regards,

    Henrry

  • 0 in reply to Henrry
    TI__Guru*** 148804 points

    HI,

    This demo provides the best performance. It is not possible to further optimize it. 

    Your understanding is not correct. B is calculated based on chirp slope and duration. It is not fixed

    thank you

    Cesar

  • 0 in reply to Cesar
    Prodigy 60 points

    Hi，

    Cesar

    I want to implement long-distance ranging (10m~100m) with the IWR1843 and achieve centimeter-level accuracy, prioritizing precision.

    Q1:

    Can I achieve this with the MRR code? I have also looked into the level_sensing demo. Can Zoom-FFT solve this problem?

    Q2:

    If I use the level_sensing demo, can I change the antenna configuration to three transmit and four receive (3T4R)? If so, what is the maximum measurement distance and accuracy that can be achieved?

    I need technical support from TI.

    Regards.

    Henrry

  • 0 in reply to Henrry
    TI__Guru*** 148804 points

    Hi 

    This performance can't be achieved with MRR Demo. 

    The level sensing demo supports 1Tx/1Rx I think. It is not possible to update it for 3T4R.

    It seems that you will not be able to achieve this performance with the sensors and demos available.

    Thank you

    Cesar