Thomas Schlichter
59af5e4ad2
Instead of trying to estimate N_UE_TA_adj with a second degree polynomial, we introduce orbit propagation to calculate N_UE_TA_adj with higher accuracy. When we receive the satellite ephemeris data consisting of the satellite position vector and the satellite velocity vector, we calculate parameters for orbit propagation, assuming a circular orbit in the plane created by the satellite position vector and the satellite velocity vector. This is done in the function prepare_ue_sat_ta(). Every millisecond, we use these parameters together with the time since epoch to calculate the satellite position on that orbit and from this the reound-trip-time between UE and the satellite, what corresponds to N_UE_TA_adj. This is done in the function apply_ntn_timing_advance().
39 lines
1.8 KiB
C
39 lines
1.8 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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#include "position_interface.h"
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#include "executables/nr-uesoftmodem.h"
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static void read_position_coordinates(char *sectionName, position_t *position)
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{
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paramdef_t position_params[] = POSITION_CONFIG_PARAMS_DEF;
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int ret = config_get(config_get_if(), position_params, sizeofArray(position_params), sectionName);
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AssertFatal(ret >= 0, "configuration couldn't be performed for position name: %s", sectionName);
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}
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void get_position_coordinates(int Mod_id, position_t *position)
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{
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AssertFatal(Mod_id < NB_UE_INST, "Mod_id must be less than NB_UE_INST. Mod_id:%d NB_UE_INST:%d", Mod_id, NB_UE_INST);
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char positionName[64];
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snprintf(positionName, sizeof(positionName), "position%d", Mod_id);
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read_position_coordinates(positionName, position);
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}
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