tle2toczml

TLE2ToCZML/node_modules/satellite.js/lib/dopplerFactor.js

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+/*!
+ * satellite-js v5.0.0
+ * (c) 2013 Shashwat Kandadai and UCSC
+ * https://github.com/shashwatak/satellite-js
+ * License: MIT
+ */
+
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports["default"] = dopplerFactor;
+function dopplerFactor(location, position, velocity) {
+  var mfactor = 7.292115E-5;
+  var c = 299792.458; // Speed of light in km/s
+
+  var range = {
+    x: position.x - location.x,
+    y: position.y - location.y,
+    z: position.z - location.z
+  };
+  range.w = Math.sqrt(Math.pow(range.x, 2) + Math.pow(range.y, 2) + Math.pow(range.z, 2));
+  var rangeVel = {
+    x: velocity.x + mfactor * location.y,
+    y: velocity.y - mfactor * location.x,
+    z: velocity.z
+  };
+  function sign(value) {
+    return value >= 0 ? 1 : -1;
+  }
+  var rangeRate = (range.x * rangeVel.x + range.y * rangeVel.y + range.z * rangeVel.z) / range.w;
+  return 1 + rangeRate / c * sign(rangeRate);
+}