diff options
Diffstat (limited to 'libqcdm/src/log-items.c')
| -rw-r--r-- | libqcdm/src/log-items.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/libqcdm/src/log-items.c b/libqcdm/src/log-items.c index de5302c7..4b75a9d2 100644 --- a/libqcdm/src/log-items.c +++ b/libqcdm/src/log-items.c @@ -18,6 +18,7 @@ #include <string.h> #include <stdlib.h> #include <endian.h> +#include <sys/param.h> #include "log-items.h" #include "errors.h" @@ -161,7 +162,7 @@ qcdm_log_item_evdo_pilot_sets_result_get_pilot (QcdmResult *result, u_int32_t num, u_int32_t *out_pilot_pn, u_int32_t *out_energy, - float *out_db, + float *out_ecio_db, u_int32_t *out_band_class, u_int32_t *out_channel, u_int32_t *out_window_center) @@ -213,21 +214,20 @@ qcdm_log_item_evdo_pilot_sets_result_get_pilot (QcdmResult *result, if (out_window_center) *out_window_center = window_center; - /* Log item pilot energy is in units from 0 (bad signal) to about 400 - * (excellent signal), derived by walking around and correlating active - * pilot energy from this log item to the RSSI from continuous Novatel - * Snapshot requests. + /* Log item pilot energy is in units from 0 (bad signal) to 400+ (excellent + * signal), derived by walking around and correlating active pilot energy + * from this log item to the RSSI from continuous Novatel Snapshot requests. */ -#define MAX_ENERGY 400 -#define MAX_ECIO 32.0 - - if (energy > MAX_ENERGY) - energy = MAX_ENERGY; if (out_energy) *out_energy = energy; - if (out_db) - *out_db = (MAX_ECIO - (((float) energy * MAX_ECIO) / (float) MAX_ENERGY)); + /* EC/IO (measured in dBm) is not received signal strength; it's an SnR + * measurement. Less (-32) = worse, high (0) = better. + */ +#define BEST_ENERGY 400 +#define WORST_ECIO 32.0 + if (out_ecio_db) + *out_ecio_db = WORST_ECIO - (((float) MIN (energy, BEST_ENERGY) * WORST_ECIO) / (float) BEST_ENERGY); return TRUE; } |