(Signal+Noise) to Noise ratio (LOG threshold)

The LOG threshold parameter is calculated to provide a signal strength estimate that is useful for qualifying reflectivity.

For historical reasons, the LOG threshold is not the true SNR (whose dB representation can be both positive and negative) but rather, the ratio of (Signal + Noise) to Noise, which always has a positive representation in dB. Specifically:

$L O G = 10 log ⁡ [ T 0 N ] ⁢$ (when applied to the dBT parameter)

$L O G = 10 log ⁡ [ R 0 N ] ⁢$ (when applied to the other parameter)