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().
54 lines
2.5 KiB
C
54 lines
2.5 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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#ifndef __POSITION_INTERFACE__H__
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#define __POSITION_INTERFACE__H__
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/* position configuration parameters name */
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#define CONFIG_STRING_POSITION_X "x"
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#define CONFIG_STRING_POSITION_Y "y"
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#define CONFIG_STRING_POSITION_Z "z"
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#define HELP_STRING_POSITION "Postion coordinates (x, y, z) config params"
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// Position parameters config
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/*----------------------------------------------------------------------------------------------------------------------------------------------------*/
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/* position configuration parameters */
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/* optname helpstr paramflags XXXptr defXXXval type numelt */
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/*----------------------------------------------------------------------------------------------------------------------------------------------------*/
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// clang-format off
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#define POSITION_CONFIG_PARAMS_DEF { \
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{CONFIG_STRING_POSITION_X, HELP_STRING_POSITION, 0, .dblptr=&(position->X), .defuintval=0, TYPE_DOUBLE, 0}, \
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{CONFIG_STRING_POSITION_Y, HELP_STRING_POSITION, 0, .dblptr=&(position->Y), .defuintval=0, TYPE_DOUBLE, 0}, \
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{CONFIG_STRING_POSITION_Z, HELP_STRING_POSITION, 0, .dblptr=&(position->Z), .defuintval=0, TYPE_DOUBLE, 0} \
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}
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// clang-format on
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typedef struct position {
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double X;
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double Y;
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double Z;
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} position_t;
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void get_position_coordinates(int Mod_id, position_t *position);
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#endif
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