spiral search

exit (0);

/*

 Start rotation

$AZ_CMAX =  4790;

$EL_CMAX = 10979;

$SK_CMAX =   931;

/**

 * Scan rectangular AZ/EL window arownd expected satellite position, alternating 

 * azimuth directions and increasing elevation offset.

 * Start with expected elevation and low az margin, scan azimuth to high margin,

 * then alternatively increase/decrease elevation

 * @param  $threshold - minimal modem signal strength

 * @param  $DishAngleCenter - array of (elevation, azimuth, skew) in degrees,

 *                            corresponding to the center of the scan window

 * @param  $wnd_az - full range of azimuth scan in degrees

 * @param  $wnd_el - full range of elevation scan in degrees

 * @param  $scan_step - elevation scan step

 * @return SimpleXMLElement - 

 */

function scan_window($threshold, $DishAngleCenter, $wnd_az, $wnd_el, $scan_step){

    global $motosat_url,$LATE_STOP_AZ,$dbg_file;

    $DishAngle = Array($DishAngleCenter[0],$DishAngleCenter[1],$DishAngleCenter[2]);

    $pass = 0;

    for ($DishAngle[1] = $DishAngleCenter[1] - $wnd_el/2;

         $DishAngle[1] <= ($DishAngleCenter[1] + $wnd_el/2);

         $DishAngle[1]+=  $scan_step) {

             if ($pass & 1) {

    $dir = 0;

    for ($delta_el = 0.0; $delta_el < $wnd_el/2; $delta_el += $scan_step) {

        $passes = ($delta_el > 0.0)? 2 : 1;

        for ($pass = 0; $pass < $passes; $pass++) {

//        for ($dir = 0; $dir < 2; $dir++) {

            if ($dir > 0){

                $DishAngle[1] = $DishAngleCenter[1] + $delta_el;

                $az_start =     $DishAngleCenter[0] + $wnd_az/2;

                $az_end =       $DishAngleCenter[0] - $wnd_az/2;

            } else {

                $DishAngle[1] = $DishAngleCenter[1] - $delta_el;

                $az_start =     $DishAngleCenter[0] - $wnd_az/2;

                $az_end =       $DishAngleCenter[0] + $wnd_az/2;

            }

             $DishAngle[0] = $az_start;

             if ($dbg_file) {

                 fprintf($dbg_file, "\npass=%d:\n",$pass);

                 fprintf($dbg_file, "\ndir=%d:\n",$dir);

                 fprintf($dbg_file, "wnd_az=%f:\n",$wnd_az);

                 fprintf($dbg_file, "wnd_el=%f:\n",$wnd_el);

                 fprintf($dbg_file, "threshold=%f:\n",$threshold);

                 fprintf($dbg_file, print_r($DishAngleCenter,1));

             }

//             while (true) {

//                 $counts = moveElAzSk_degrees($DishAngle);

//                 if (!isset($counts)) break;

//             }

             while (null !==moveElAzSk_degrees($DishAngle));

             $DishAngle[0] = $az_end;

                 foreach ($DishCount as $key => $value){

                     $DishCount[$key] = $value + 0;

                 }

                 if ($pass & 1){

                 if ($dir > 0){

                     $DishCount[0] += $LATE_STOP_AZ;

                 } else {

                     $DishCount[0] -= $LATE_STOP_AZ;

                 return $xml_state;

             }

             $pass ++;

        }

        $dir = 1-$dir;

    }

    moveElAzSk_degrees($DishAngleCenter);

//    while (true) {

//        $counts = moveElAzSk_degrees($DishAngleCenter);

//        if (!isset($counts)) break;

//    }

    while (null !==moveElAzSk_degrees($DishAngleCenter));

    $xml_state = simplexml_load_file($motosat_url);