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sourcestats: provide frequency SD in tracking data

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This commit is contained in:
Miroslav Lichvar
2018-08-17 08:01:03 +02:00
parent 05d9edbf8f
commit cca2ef4649
3 changed files with 11 additions and 6 deletions
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7
sourcestats.c
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@@ -132,6 +132,7 @@ struct SST_Stats_Record {
source per unit local time. (Positive => local clock fast,
negative => local clock slow) */
double estimated_frequency;
double estimated_frequency_sd;
/* This is the assumed worst case bounds on the estimated frequency.
We assume that the true frequency lies within +/- half this much
@@ -245,6 +246,7 @@ SST_ResetInstance(SST_Stats inst)
inst->best_single_sample = 0;
inst->min_delay_sample = 0;
inst->estimated_frequency = 0;
inst->estimated_frequency_sd = WORST_CASE_FREQ_BOUND;
inst->skew = WORST_CASE_FREQ_BOUND;
inst->estimated_offset = 0.0;
inst->estimated_offset_sd = 86400.0; /* Assume it's at least within a day! */
@@ -571,6 +573,7 @@ SST_DoNewRegression(SST_Stats inst)
old_freq = inst->estimated_frequency;
inst->estimated_frequency = est_slope;
inst->estimated_frequency_sd = CLAMP(MIN_SKEW, est_slope_sd, MAX_SKEW);
inst->skew = est_slope_sd * RGR_GetTCoef(degrees_of_freedom);
inst->estimated_offset = est_intercept;
inst->offset_time = inst->sample_times[inst->last_sample];
@@ -601,6 +604,7 @@ SST_DoNewRegression(SST_Stats inst)
prune_register(inst, best_start);
} else {
inst->estimated_frequency = 0.0;
inst->estimated_frequency_sd = WORST_CASE_FREQ_BOUND;
inst->skew = WORST_CASE_FREQ_BOUND;
times_back_start = 0;
}
@@ -700,7 +704,7 @@ SST_GetSelectionData(SST_Stats inst, struct timespec *now,
void
SST_GetTrackingData(SST_Stats inst, struct timespec *ref_time,
double *average_offset, double *offset_sd,
double *frequency, double *skew,
double *frequency, double *frequency_sd, double *skew,
double *root_delay, double *root_dispersion)
{
int i, j;
@@ -715,6 +719,7 @@ SST_GetTrackingData(SST_Stats inst, struct timespec *ref_time,
*average_offset = inst->estimated_offset;
*offset_sd = inst->estimated_offset_sd;
*frequency = inst->estimated_frequency;
*frequency_sd = inst->estimated_frequency_sd;
*skew = inst->skew;
*root_delay = inst->root_delays[j];