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Measure signal power / noise power (at least in 2.4MHz mode).

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Switch signalLevel back to a power measurement, don't put SNR in there.
But make it a 0.0 - 1.0 double so we're not scaling everywhere.

Adjust for the amplitude offset when calculating power.

Adapt everything else to the new scheme.
This commit is contained in:
Oliver Jowett 2015-01-22 01:01:39 +00:00
parent 5beecb9f4f
commit 19082d92ea
9 changed files with 118 additions and 28 deletions
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33
stats.c
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@ -110,6 +110,22 @@ void display_stats(struct stats *st) {
printf("%d phase enhancement attempts\n", st->out_of_phase);
display_demod_stats("phase enhanced ", &st->demod_phasecorrected);
}
if (st->noise_power_count) {
printf("%.1f dBFS noise floor\n",
10 * log10(st->noise_power_sum / st->noise_power_count));
}
if (st->signal_power_count) {
printf("%.1f dBFS mean signal power\n",
10 * log10(st->signal_power_sum / st->signal_power_count));
}
printf("%.1f dBFS peak signal power\n",
10 * log10(st->peak_signal_power));
printf("%u messages with signal power above -3dBFS\n",
st->strong_signal_count);
}
printf("%d remote messages accepted\n"
@ -206,6 +222,23 @@ void add_stats(const struct stats *st1, const struct stats *st2, struct stats *t
// total messages:
target->messages_total = st1->messages_total + st2->messages_total;
// noise floor:
target->noise_power_sum = st1->noise_power_sum + st2->noise_power_sum;
target->noise_power_count = st1->noise_power_count + st2->noise_power_count;
// mean signal power:
target->signal_power_sum = st1->signal_power_sum + st2->signal_power_sum;
target->signal_power_count = st1->signal_power_count + st2->signal_power_count;
// peak signal power seen
if (st1->peak_signal_power > st2->peak_signal_power)
target->peak_signal_power = st1->peak_signal_power;
else
target->peak_signal_power = st2->peak_signal_power;
// strong signals
target->strong_signal_count = st1->strong_signal_count + st2->strong_signal_count;
// CPR decoding:
target->cpr_global_ok = st1->cpr_global_ok + st2->cpr_global_ok;
target->cpr_global_bad = st1->cpr_global_bad + st2->cpr_global_bad;