spiral search

test_01.php

@@ -272,35 +272,41 @@ printf($rslt);
 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) {
-                 $az_start = $DishAngleCenter[0] + $wnd_az/2;
-                 $az_end =   $DishAngleCenter[0] - $wnd_az/2;
-             } else {
-                 $az_start = $DishAngleCenter[0] - $wnd_az/2;
-                 $az_end =   $DishAngleCenter[0] + $wnd_az/2;
-             }
+    $dir = 0;
+    for ($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",$threshold);
@@ -311,11 +317,6 @@ function scan_window($threshold, $DishAngleCenter, $wnd_az, $wnd_el, $scan_step)
                  fprintf($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;
              
@@ -346,7 +347,7 @@ function scan_window($threshold, $DishAngleCenter, $wnd_az, $wnd_el, $scan_step)
                  foreach ($DishCount as $key => $value){
                      $DishCount[$key] = $value + 0;
                  }
-                 if ($pass & 1){
+                 if ($dir > 0){
                      $DishCount[0] += $LATE_STOP_AZ;
                  } else {
                      $DishCount[0] -= $LATE_STOP_AZ;
@@ -367,13 +368,10 @@ function scan_window($threshold, $DishAngleCenter, $wnd_az, $wnd_el, $scan_step)
                  
                  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);