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69 lines
2.1 KiB
69 lines
2.1 KiB
/*
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* Was locator.ino
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* Created on: Nov 4, 2019
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* Author: user
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*/
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// locatorR.ino Bob Larkin 12 Nov 2022
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// Built from the K. Goba double precision files.
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// Data types float precision, funtion unchanged, names have added 'f'
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const float32_t EARTH_RAD = 6371.0f; //radius in km
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float32_t Latitude, Longitude;
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float32_t Station_Latitude, Station_Longitude;
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float32_t Target_Latitude, Target_Longitude;
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void set_Station_Coordinates(char station[]){
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process_locator(station);
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Station_Latitude = Latitude;
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Station_Longitude = Longitude;
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}
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float32_t Target_Distancef(char target[]) {
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float32_t targetDistance;
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process_locator(target);
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Target_Latitude = Latitude;
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Target_Longitude = Longitude;
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targetDistance = distancef((float32_t)Station_Latitude, (float32_t)Station_Longitude,
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(float32_t)Target_Latitude, (float32_t)Target_Longitude);
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return targetDistance;
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}
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void process_locator(char locator[]) {
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uint8_t A1, A2, N1, N2;
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uint8_t A1_value, A2_value, N1_value, N2_value;
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float32_t Latitude_1, Latitude_2, Latitude_3;
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float32_t Longitude_1, Longitude_2, Longitude_3;
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A1 = locator[0];
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A2 = locator[1];
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N1 = locator[2];
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N2= locator [3];
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A1_value = A1-65;
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A2_value = A2-65;
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N1_value = N1- 48;
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N2_value = N2 - 48;
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Latitude_1 = (float32_t) A2_value * 10.0f;
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Latitude_2 = (float32_t) N2_value;
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Latitude_3 = (11.0f/24.0f + 1.0f/48.0f) - 90.0f;
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Latitude = Latitude_1 + Latitude_2 + Latitude_3;
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Longitude_1 = (float32_t)A1_value * 20.0f;
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Longitude_2 = (float32_t)N1_value * 2.0f;
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Longitude_3 = 11.0f/12.0f + 1.0f/24.0f;
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// global Longitude
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Longitude = Longitude_1 + Longitude_2 + Longitude_3 - 180.0f;
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}
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// distance (km) on earth's surface from point 1 to point 2
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float32_t distancef(float32_t lat1, float32_t lon1, float32_t lat2, float32_t lon2) {
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float32_t lat1r = deg2radf(lat1);
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float32_t lon1r = deg2radf(lon1);
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float32_t lat2r = deg2radf(lat2);
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float32_t lon2r = deg2radf(lon2);
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return acos(sinf(lat1r) * sinf(lat2r) +
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cosf(lat1r) * cosf(lat2r) * cosf(lon2r-lon1r)) * EARTH_RAD;
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}
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// convert degrees to radians (i.e., * PI/180)
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float32_t deg2radf(float32_t deg)
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{
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return deg * 0.017453292f;
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}
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