Drone Simulation (IMAGE) University of California - Riverside Caption Simulation results for an unmanned drone flying over downtown Los Angeles showing the true trajectory (red line), with GPS navigation only (yellow line), and GPS aided with cellular signals (blue line). Credit ASPIN LABORATORY AT UC RIVERSIDE Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.