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NR UE: provide velocity vector down to nr-ue.c, preparing for Doppler calculation

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This commit is contained in:
Thomas Schlichter
2025-12-19 16:38:59 +01:00
parent 479be40b30
commit b59bcaf494
6 changed files with 81 additions and 24 deletions
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executables/nr-ue.c
+32 -11
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@@ -732,15 +732,32 @@ static inline void apply_ntn_timing_advance(PHY_VARS_NR_UE *UE, const NR_DL_FRAM
+ ntn_config_params->epoch_hfn * 10240;
const int ms_since_epoch = abs_subframe_tx - abs_subframe_epoch;
const double omega = ntn_config_params->omega;
const double cos_wt = cos(omega * ms_since_epoch);
const double sin_wt = sin(omega * ms_since_epoch);
const position_t pos_sat_0 = ntn_config_params->pos_sat_0;
const position_t pos_sat_90 = ntn_config_params->pos_sat_90;
const position_t pos_sat = {pos_sat_0.X * cos_wt + pos_sat_90.X * sin_wt,
pos_sat_0.Y * cos_wt + pos_sat_90.Y * sin_wt,
pos_sat_0.Z * cos_wt + pos_sat_90.Z * sin_wt};
const position_t vel_sat_0 = ntn_config_params->vel_sat_0;
position_t pos_sat;
position_t vel_sat;
const double omega = ntn_config_params->omega;
if (omega) {
const double cos_wt = cos(omega * ms_since_epoch);
const double sin_wt = sin(omega * ms_since_epoch);
const position_t pos_sat_90 = ntn_config_params->pos_sat_90;
pos_sat = (position_t){pos_sat_0.X * cos_wt + pos_sat_90.X * sin_wt,
pos_sat_0.Y * cos_wt + pos_sat_90.Y * sin_wt,
pos_sat_0.Z * cos_wt + pos_sat_90.Z * sin_wt};
const position_t vel_sat_90 = ntn_config_params->vel_sat_90;
vel_sat = (position_t){vel_sat_0.X * cos_wt + vel_sat_90.X * sin_wt,
vel_sat_0.Y * cos_wt + vel_sat_90.Y * sin_wt,
vel_sat_0.Z * cos_wt + vel_sat_90.Z * sin_wt};
} else {
pos_sat = (position_t){pos_sat_0.X + vel_sat_0.X * ms_since_epoch / 1000,
pos_sat_0.Y + vel_sat_0.Y * ms_since_epoch / 1000,
pos_sat_0.Z + vel_sat_0.Z * ms_since_epoch / 1000};
vel_sat = vel_sat_0;
}
position_t pos_ue = {0};
get_position_coordinates(UE->Mod_id, &pos_ue);
@@ -751,6 +768,9 @@ static inline void apply_ntn_timing_advance(PHY_VARS_NR_UE *UE, const NR_DL_FRAM
// calculate distance between SAT and UE
const double distance = sqrt(dir_sat_ue.X * dir_sat_ue.X + dir_sat_ue.Y * dir_sat_ue.Y + dir_sat_ue.Z * dir_sat_ue.Z);
// calculate projected velocity from SAT towards UE
const double vel_sat_ue = (vel_sat.X * dir_sat_ue.X + vel_sat.Y * dir_sat_ue.Y + vel_sat.Z * dir_sat_ue.Z) / distance;
// calculate round-trip-time (factor 2) between SAT and UE in ms (factor 1000)
const double N_UE_TA_adj = 2000 * distance / SPEED_OF_LIGHT;
@@ -764,14 +784,15 @@ static inline void apply_ntn_timing_advance(PHY_VARS_NR_UE *UE, const NR_DL_FRAM
* fp->samples_per_subframe;
LOG_D(PHY,
"N_UE_TA_adj = %f ms, N_common_ta_adj = %f ms, N_common_ta_drift = %f µs/s, N_common_ta_drift_variant = %f µs/s², ms_since_epoch = %d ms, "
"computed timing_advance_ntn = %d samples\n",
"N_UE_TA_adj = %f ms, N_common_ta_adj = %f ms, N_common_ta_drift = %f µs/s, N_common_ta_drift_variant = %f µs/s², "
"ms_since_epoch = %d ms, computed timing_advance_ntn = %d samples, satellite velocity towards UE = %f m/s\n",
N_UE_TA_adj,
N_common_ta_adj,
N_common_ta_drift,
N_common_ta_drift_variant,
ms_since_epoch,
UE->timing_advance_ntn);
UE->timing_advance_ntn,
vel_sat_ue);
}
static inline void apply_ntn_config(PHY_VARS_NR_UE *UE,