Table Of Contents

Logarithmic Chirp Specifications

Version:
    Last Modified: March 31, 2021

    The following specifications apply to the Configure Chirp (N Ch) VI when configuring a logarithmic chirp signal.

    Start frequency range ≤PDM rate/32, corresponding to 96 kHz at 3.072 MHz PDM rate
    Stop frequency range ≤PDM rate/32
    Pre-chirp duration range 0 to 232 − 1 PDM samples, or approximately 23 minutes at PDM rate of 3.072 MHz
    Chirp duration range 0 to 232 − 1 − Pre-chirp duration samples

    The logarithmic chirp rate range, in seconds, is defined by the following equation:

    Logarithmic chirp rate range = ± ( Stop freq / Start freq ) / Chirp duration

    Refer to the following table for maximum chirp rates at different PDM rates.

    Table 1. Maximum Logarithmic Chirp Rate at Different PDM Rates
    Maximum Logarithmic Chirp Rate PDM Rate = 600 kHz PDM Rate = 800 kHz PDM Rate = 2.4 MHz PDM Rate = 3.072 MHz PDM Rate = 4.8 MHz
    Range ±105 octave/s ±140 octave/s ±422 octave/s ±541 octave/s ±845 octave/s
    Minimum chirp time for 10 octaves 95 ms 71 ms 24 ms 18.5 ms 12 ms

    Recently Viewed Topics