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75 lines
2.1 KiB
75 lines
2.1 KiB
/*
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* locator.ino
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*
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* Created on: Nov 4, 2019
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* Author: user
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*/
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//#include "locator.h"
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//#include <math.h>
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//#include "arm_math.h"
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// TODO - Looks like single precision would be adequate - RSL
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const double EARTH_RAD = 6371; //radius in km
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//void process_locator(char locator[]);
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//double distance(double lat1, double lon1, double lat2, double lon2);
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//double deg2rad(double deg);
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float Latitude, Longitude;
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float Station_Latitude, Station_Longitude;
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float Target_Latitude, Target_Longitude;
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//float Target_Distance(char target[]);
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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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float Target_Distance(char target[]) {
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float 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 = (float) distance((double)Station_Latitude,(double)Station_Longitude,
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(double)Target_Latitude,(double)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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float Latitude_1, Latitude_2, Latitude_3;
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float 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 = (float) A2_value * 10;
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Latitude_2 = (float) N2_value;
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Latitude_3 = (11.0/24.0 + 1.0/48.0) - 90.0;
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Latitude = Latitude_1 + Latitude_2 + Latitude_3;
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Longitude_1 = (float)A1_value * 20.0;
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Longitude_2 = (float)N1_value * 2.0;
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Longitude_3 = 11.0/12.0 + 1.0/24.0;
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Longitude = Longitude_1 + Longitude_2 + Longitude_3 - 180.0;
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}
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// distance (km) on earth's surface from point 1 to point 2
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double distance(double lat1, double lon1, double lat2, double lon2) {
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double lat1r = deg2rad(lat1);
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double lon1r = deg2rad(lon1);
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double lat2r = deg2rad(lat2);
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double lon2r = deg2rad(lon2);
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return acos(sin(lat1r) * sin(lat2r)+cos(lat1r) * cos(lat2r) * cos(lon2r-lon1r)) * EARTH_RAD;
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}
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// convert degrees to radians
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double deg2rad(double deg)
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{
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return deg * (PI / 180.0);
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}
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