Proxim RangeLAN2 7920 Manual do Utilizador descarregar pdf (Página 70)

tcp_tick(&StopNavsock);

/*Convert degree based LAT/LONG to meters.*/

LATm = ((LATDEG* 60)+LATMIN)*1852;

LONGm = -((LONGDEG*60)+LONGMIN)*1852*cos (.628 );

// printf("longm = %f\n",LONGm);

// printf("latm = %f\n",LATm);

/*Convert Waypoint LAT/LONG to meters.*/

WPLATm = ((WPLATDEG*60)+WPLATMIN)*1852;

WPLONGm = -((WPLONGDEG*60)+WPLONGMIN)*1852*cos (.628);

// printf("wplongm = %f\n",WPLONGm);

// printf("wplatm = %f\n",WPLATm);

/*Determine hdg and dist to WP.*/

DIFFLONGm = WPLONGm - LONGm;

DIFFLATm = WPLATm - LATm;

// printf("difflongm = %f\n",DIFFLONGm);

// printf("difflatm = %f\n",DIFFLATm);

DIST = sqrt (DIFFLONGm*DIFFLONGm + DIFFLATm*DIFFLATm);

// printf("dist = %f\n",DIST);

//DIVIDE BY ZERO PREVENTION

if(DIFFLONGm == 0)

DIFFLONGm = 0.001;

if(DIFFLATm == 0)

DIFFLATm = 0.001;

//Conditional statements to determine heading depending upon quadrant

if(DIFFLONGm>=0 && DIFFLATm>=0)

{CTS = 180/pi * atan (DIFFLONGm/DIFFLATm);}

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Proxim RangeLAN2 7920 Manual do Utilizador Página 70