Ralf Bachmayer

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This paper reports two specific improvements in the finite-dimensional nonlinear dynamical modeling of marine thrusters. Previously reported four-quadrant models have employed thin airfoil theory considering only axial fluid flow and using sinusoidal lift/drag curves. First, we present a thruster model incorporating the effects of rotational fluid velocity(More)
The Autonomous Ocean Sampling Network-II (AOSN-II) and Adaptive Sampling And Prediction (ASAP) projects aim to develop a sustainable, portable, adaptive ocean observing and prediction system for use in coastal environments. These projects employ, among other observation platforms, autonomous underwater vehicles that carry sensors to measure physical and(More)
This paper reports the development of a new remotely operated underwater vehicle (ROV) designed to serve as a platform for rapid development and deployment of novel underwater vehicle systems. The goal is to enhance our ability develop new underwater vehicle subsystems in the laboratory, and rapidly field-test these new systems. Although a significant(More)
Autonomous underwater vehicles, and in particular autonomous underwater gliders, represent a rapidly maturing technology with a large cost-saving potential over current ocean sampling technologies for sustained (month at a time) real-time measurements. In this paper we give an overview of the main building blocks of an underwater glider system for(More)
In this paper we describe the design and evaluation of the prototype vehicle for a new test-bed developed for multi-vehicle control, navigation and communication. The vehicle is designed for high reliability and easy recon guration using smart sensor and actuator interfaces. It is passively stable in pitch and roll and is actuated by ve thrusters. The(More)
A terrain-aided navigation method for an underwater glider is proposed that is suitable for use in ice-covered regions or areas with heavy ship traffic where the glider may not be able to surface for GPS location updates. The algorithm is based on a jittered bootstrap algorithm, which is a type of particle filter that makes use of the vehicle’s(More)