We propose a computer vision system, called a “visual supervisor”, capable of visually monitoring an environment with the goal of safety monitoring and task verification. We demonstrate our system in a spaceborne setting in which from monocular video sequences, it 1) tracks and recognizes objects, 2) detects workspace violations, and 3) supervises in-progress tasks for anomalous situations, fai...

Simulation technology is becoming increasingly crucial in the design and optimization of satellites due to the difficulties in testing and verifying system parameters on the ground. Computationally tractable and accurate methods are required in order to test satellite parameters in the complex and dynamic space environment. Although various satellite teams have developed simulation tools, many ...

This contribution to the EUCREX mission 206 series aims at evaluating the performances of Ž three methods considered for the retrieval of cloud microphysical properties optical depth, droplet Ž .. effective radius and liquid water path LWP from Advanced Very High Resolution Radiometer Ž . AVHRR satellite images. These procedures, namely a set of empirical parameterizations, a physically based i...

Abstract The Lucy Mission accomplishes its science during a series of five flyby encounters with seven Trojan asteroid targets. This mission architecture drives concept operations design that maximizes return, provides redundancy in observations where possible, features autonomous fault protection, and utilizes onboard target tracking near closest approach. These considerations reduce risk the ...

Many research based on indoor positioning and tracking systems have been developed due to growing interest in location-aware services. Nevertheless, satisfying solutions have not been found with the considerations of both accuracy and system complexity. In fact, an indoor localization system highly accurate, low energy, widely available, and easily deployed has not yet been developed. Hence, th...

Mobile entity navigation in dynamic environments is an essential part of many mission critical applications like search and rescue and fire fighting. The dynamism of the environment necessitates the mobile entity to constantly maintain a high degree of awareness of the changing environment. This criteria makes it difficult to achieve good navigation performance by using just on-board sensors an...

The technology and experiments planned for rover localization and landing site mapping in the 2003 Mars Exploration Rover (MER) mission are described. We introduce the Mars global and landing site local reference systems. For global rover localization in the Mars body-fixed reference system, a triangulation can be performed using observations of common landmarks on satellite images and the very...

Satellite-based tracking of migratory waterfowl is an important tool for understanding the potential role of wild birds in the long-distance transmission of highly pathogenic avian influenza. However, employing this technique on a continental scale is prohibitively expensive. This study explores the utility of stable isotope ratios in feathers in examining both the distances traveled by migrato...