A satellite communications system is based on antennas in a stable orbit above the earth. Satellites serve as relay stations in the sky. The basic idea of satellite communications is that two stations on earth discuss via one or more satellites. So a little bit of satellite-related terminology: 1. Earth station is an antenna on or near the surface of the earth. 2. Uplink is a transmission from ...

Spatial, Temporal, and Spectral Resolution (STSR) are three key characteristics of Earth observation satellite sensors; however, any single satellite sensor cannot provide Earth observations with high STSR simultaneously because of the hardware technology limitations of satellite sensors. On the other hand, a conflicting circumstance is that the demand for high STSR has been growing with the re...

In late April 2006, NASA launched Cloudsat, an earth-observing satellite that uses a near-nadir-pointing millimeter-wavelength radar to probe the vertical structure of clouds and precipitation. The first step in using Cloudsat measurements is to distinguish clouds and other hydrometeors from radar noise. In this article the operational Cloudsat hydrometeor detection algorithm is described, diff...

Keyword : Multi-Satellite Operations、OGC Sensor Planning Service、FORMOSAT-2 Abstract FORMOSAT-2, an earth observation remote sensing satellite has been launched and operated by National Space Organization, National Applied Research Laboratories (NARLabs-NSPO) of Taiwan since 2004. Its unique daily revisit feature with 2-m GSD has demonstrated tremendous benefits in various applications especial...

Fast and reliable ambiguity resolution (AR) has been a continuing challenge for real-time precise positioning based on dual-frequency Global Navigation Satellite Systems (GNSS) carrier phase observation. New GNSS systems (i.e., GPS modernization, BDS (BeiDou Navigation Satellite System), GLONASS (Global Navigation Satellite System), and Galileo) will provide multiple-frequency signals. The GNSS...

An Integrated Earth Sensing demands seamless access to large-scale geospatial data gathered by remote sensing and in-situ sensor network deployments. To that end, the Global Earth Observation (GEO) Grid provides a framework for sharing a wide array of scientific information such as satellite data, geologic maps, and insitu sensing data in a standards-compliant manner. In this paper, we describe...

In this paper, we show how an Earth watching mission, dedicated to the detection and the tracking of forest fires and volcanic eruptions, and involving a constellation of low-orbiting satellites, equipped with detection and observation instruments, can be reactively and efficiently managed via the cooperation of decision modules implemented on the ground in a mission control center and onboard ...

Remotely sensed data provided information on Earth phenomena in different modalities, spectrally, spatially and temporally inhomogeneous. But all this set of data proposes different representations of the same physical environment. How to handle these different representations, how to extract the best of a combination of them? Data fusion is one of the answers to the best possible use of this s...

ASNARO (Advanced Satellite with New system ARchitecture for Observation) system outline including payload characteristics and bus architecture is presented in this paper. ASNARO, which is being developed by NEC and USEF under the contract with NEDO, is a LEO satellite for the earth observation by optical sensor in sub-meter class. The bus module of the ASNARO is highly adaptive for various miss...

Communication via satellite begins when the satellite is positioned in the desired orbital position. Ground stations can communicate with LEO (Low Earth Orbiting) satellites only when the satellite is in their visibility region. The duration of the visibility and so the communication duration varies for each satellite pass at the ground station, specifically for LEO satellites which do move too...