This paper presents a high-precision local positioning system (LPS) for an autonomous robotic greens mower. The LPS uses a sensor tower mounted on top of the robot and four active beacons surrounding a target area. The proposed LPS concurrently determines robot location and orientation. To perform localization, the sensor tower emits an ultrasonic pulse that is received by the beacons. The time...

Introduction: The McMurdo Dry Valleys of Antarctica have commonly been used as an analog for Mars; analogies are due in part to the regions hyperarid and cold climate as well as its abundance of similar-appearing microscale and macroscale morphological features such as gullies, lineated valley fill, and polygons [eg. 1,2,3]. With the recent direct observations of water ice on Mars from the NASA...

Unlike aerial or terrestrial navigation, the global navigation satellite system (GNSS) is not available underwater. This a big challenge for underwater navigation. The inertial (INS) aided by single-beacon acoustic positioning (APS) provides one solution, but long-range case limited low-SNR conditions. Inspired passive synthetic aperture detection, we proposed new tightly coupled algorithm base...

Ramadurai, Vaidyanathan. Localization in Wireless Sensor Networks with Inaccurate Range Measurements. (Under the direction of Assistant Professor Mihail L. Sichitiu). We refer to localization as the problem of estimating the spatial coordinates of wireless nodes in an ad-hoc network. Wireless sensor network is an example of such a network, where localization as a problem has been a challenging ...

Automatic dependent surveillance-broadcast (ADS-B) is a very important communication and surveillance technology in air traffic control (ATC). In the future, more satellites will carry out ADS-B to perform global coverage. order make full use of resources satellite, this paper proposes solution for satellite three-axis attitude determination using receiver. The principle ADS-B-based presented f...

It is known that partially (spatial) coherent beams can reduce the effects of scintillation in a free space optical link. However, practical implementations of this type of beam are still under investigation. In this work we apply a wave optics model to analyze the propagation through turbulence of a coherent beam and a particular version of a pseudo-partially coherent beam. The beam we study i...