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IWR1443BOOST: Time separation between two chirps

Sanjib Sur
Intellectual 550 points
Part Number: IWR1443BOOST
Other Parts Discussed in Thread: IWR1443

Hello,

I am using IWR1443 board. I am trying to figure out the absolute time separation between two back-to-back chirps. I have the following parameters:


profile_id = 0;
start_freq = 77;
idle_time = 100;
adc_start_time = 6;
ramp_end_time = 60;
freq_slope = 29.982;
tx_start_time = 0;
adc_samples = 256;
sample_rate = 10000;

frame_periodicity = 40 ms;

number of chirps per frame = 128;

Does this mean the device spends 166 us per one chirp?

idle_time + adc_start_time + ramp_end_time = 166 us;

Thanks,

Sanjib

  • Former Member
    0 Former Member

    The time per chirp is idle time + ramp end time so in your example 160.

    A valid ramp end time requires: ramp end time > adc start time + adc sampling time. Where adc sampling time is #adc samples / adc sampling rate.

  • 0 in reply to Former Member
    Intellectual 550 points

    Thank you very much! Could you please point out the document which summarizes the valid board configuration parameters?

    --

    Sanjib

  • Former Member
    0 Former Member in reply to Sanjib Sur

    Sanjib,

    If you refer to the mmWave Link documentation. You can see the valid bounds for each parameter. However these ranges are independent values and you still have to ensure that your configuration is within memory, timing, device limitations.

    There isn't currently a document that summarizes it in formulas but if you look at the chirp diagram in the SDK documentation that comes before the details on the parameters you can see how the various parameters effect each other.

    Amanda