Recently small satellites start playing important roles in earth observation missions. It, however, is true that small satellites have drawbacks of sensor resolutions and down link data rate. As a solution to the latter drawback, we have developed novel communications system for 320Mbps down link with 16QAM for small satellites with 50kg class. We developed a new GaN HEMT X-band amplifier with ...

The deployment of space robots for servicing and maintenance operations, which are teleoperated from ground, is a valuable addition to existing autonomous systems since it will provide flexibility and robustness in mission operations. In this connection, not only robotic manipulators are of great use but also free-flying inspector satellites supporting the operations through additional feedback...

There are a growing number of small satellites that are being launched and operated to accomplish novel science and technology missions. Scientists and mission operators are seeking to download large quantities of data from these small satellites, however they are resource-constrained and communicate to capacity-constrained ground networks. Motivated by the need for intelligent operational sche...

In this paper, we present a novel and comprehensive resource management solution for the autonomous hot-spot convergence system (AHSCS) that uses sensor web. This solution is in response to a call for solution at the WPDRTS 2002. The proposed solution involves system analysis and design and developing a new resource management methodology, which we call Feedback-based Adaptive Resource Manageme...

The statistics of estimated errors when conducting the orbit determination of a tethered satellite system (TSS) by only using Doppler frequencies is shown. TSS consists of two satellites connected each other by a tether. The center of mass (CM) moves like a single satellite, so this system can be utilized in case of a single satellite as well as TSS. This is considered as a low-cost orbit deter...

A variety of deformation surveying techniques have been extensively used for measuring the pattern of ground subsidence. These include precise levelling, total station traversing, aerial photogrammetry and GPS surveys. The impact on the surface infrastructure of underground coal mining to the southwest of Sydney is continuously monitored using a combination of these techniques. Since 2002, expe...

We investigated theoretical considerations in the design of an Earth-based laser interferometer for detecting gravitational waves. Our design envisages a ground-based tracking station in communication with two geosynchronous satellites. We assumed linearized gravitational waves in a Schwarzschild spacetime geometry outside the Earth. Our initial calculations show that such a design is sufficien...

[1] This paper is an overview of the validation of the total column ozone data products from the Ozone Monitoring Instrument (OMI) on board the NASA EOS-Aura satellite. OMI is an imaging UV/visible spectrometer that maps global ozone on a daily basis. There are two ozone products from OMI, one derived using the traditional TOMS retrieval algorithm and another derived using a Differential Optica...