For obtaining the height information, a vertically damped inertial navigation system (INS) using the height reference of barometer measurements is conventionally instrumented. Since it requires delicate construction of INS system, in many cases, it has been costly. In this paper, a novel altitude estimation system is proposed by effectively combining the information of the GPS height and air da...

Tim Murphy is Technical Fellow with Boeing Commercial Airplanes where he is a member of the Electronic Systems organization. Tim has 25 years of experience in radio navigation communications and surveillance systems for civil aviation. The current focus of his work is avionics for new airplane product development, and next generation CNS technologies to support Air Traffic Management including ...

In 1993, the Space Shuttle Program selected an off-the-shelf Global Positioning System (GPS) receiver to eventually replace the three Tactical Air Navigation units on each space shuttle orbiter. A proven, large production base GPS receiver was believed to be the key to reducing integration, certification, and maintenance costs. More GPS software changes, shuttle flight software changes, and fli...

The development, implementation, and ight results for a navigation algorithm and an energy management system are presented. The navigation algorithm employs both a Kalman lter and an inertial navigation routine. The energy management system includes an asymptotic targeting algorithm and pneumatically deployed air brakes that deplete excess energy from the rocket in ight. These algorithms were d...

Flight test results and lessons learned are presented for a helicopter UAV low-altitude navigation and landing system. Results are given for both urban and natural settings. The navigation component uses a quasi-3D A* approach to route planning that enables maneuver through complex terrain using real-time sensor data. The landing component performs landings to sites that it determines to be saf...

The Space Shuttle program began flying atmospheric flight navigation units in 1993, in support of Shuttle avionics upgrades. In the early 1990s, it was anticipated that proven in-production navigation units would greatly reduce integration, certification and maintenance costs. However, technical issues arising from ground and flight tests resulted in a slip in the Shuttle GPS certification date...

Bio-inspired vehicles are currently leading the way in the quest to produce a vehicle capable of flight and underwater navigation. However, a fully functional vehicle has not yet been realized. We present the first fully functional vehicle platform operating in air and underwater with seamless transition between both mediums. These unique capabilities combined with the hovering, high maneuverab...