X4 How can I increase the depth(?) of range?

Discussion in 'X2 & X4 SoC' started by rhee, Oct 11, 2017.

  1. rhee

    rhee New Member


    I used an NVA-6201(X2) before, and now I'm using an X4M03.

    When I used the NVA-6201, I was able to divide 1-meter range into 256 depth(range bin).

    So the interval among each bin was 1/256-meter.

    Recently, I got the X4M03.

    I'm testing the X4M03 with a matlab example(XEP_X4_configure_radar.m).

    But it provides only 37 depth per 1-meter.

    And I think there's no option to change its depth.

    Is there any way to increase the range depth of X4M03 in matlab?
  2. Charlie Shao

    Charlie Shao Moderator Staff Member

    Hi Rhee,

    The sampling rate of X4 is fixed to 23.328 GS/s, see the X4 datasheet section 1.4. A full frame consists of 1536 bins, which corresponds to 9.9 meters in air. The X4 supports on-chip downconvertion, mixing the signal to baseband, allowing decimation of the frame without losing information. The decimation factor is 8, which will result in a frame sampled at 2.916 GS/s, The baseband frame is represented by complex numbers and a full frame is then represented by 188 complex bins.

    The matlab example “XEP_X4_plot_frame.m” enables downconvertion by default. Try to change the variable datatype from ‘bb’ to ‘rf’ to enable rf data.
  3. rhee

    rhee New Member

    Thanks for your reply.

    So, you mean that the depth(range bin) of X4M03 is up to 188 per one meter?

    The NVA-6201(X2) supports 256 depth(range bins) per one meter.

    I think we have to consider that the NVA-6201 doesn't support a complex result.

    But the range bin spec of X4M03 is worse than NVA-6201(X2)?
    Last edited: Oct 14, 2017