initial commit

RandomTrajectorySimulator.py

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+""" simplest implementation of a trajectory simulation where the simulated
+aircraft is randomly distributed inside a circle
+
+mutex protection occurs when calling replace_message
+
+This program is free software: you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later
+version.
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+You should have received a copy of the GNU General Public License along with
+this program. If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import random
+import datetime, math
+from AbstractTrajectorySimulatorBase import AbstractTrajectorySimulatorBase
+
+class RandomTrajectorySimulator(AbstractTrajectorySimulatorBase):
+    def __init__(self,mutex,broadcast_thread,aircrafinfos):
+        super().__init__(mutex,broadcast_thread,aircrafinfos)
+        self._starttime = datetime.datetime.now(datetime.timezone.utc)
+        
+        self._lat0 = aircrafinfos.lat_deg
+        self._lon0 = aircrafinfos.lon_deg
+
+        self._max_alt_m = aircrafinfos.alt_msl_m
+        self._max_speed_mps = aircrafinfos.speed_mps
+
+    def refresh_delay(self):
+        return 0.005
+
+    def update_aircraftinfos(self):
+        
+        d0 = self._max_speed_mps * 30.0
+        Rlat = (d0/6371000.0)*(180.0/math.pi)
+        Rlon = Rlat/math.cos(self._lat0*math.pi/180.0)
+        self._aircraftinfos.track_angle_deg = random.uniform(0,360.0)
+        self._aircraftinfos.lat_deg = self._lat0 - random.uniform(-Rlat,Rlat)
+        self._aircraftinfos.lon_deg = self._lon0 + random.uniform(-Rlon,Rlon)
+
+        self._aircraftinfos.alt_msl_m = random.uniform(1.0,self._max_alt_m)
+        self._aircraftinfos.speed_mps = random.uniform(0.0,self._max_speed_mps)