Haruo Tamaki

A prototype system of the MAD-SS wide area sensor network using a weather balloon

In this study, we conducted long-distance radio propagation experiments at 1mW/145 MHz to realize low-power long-distance communication for wildlife research and disaster prevention telemetry [1]. We successfully realized long-distance communications from a weather balloon (elevation: ~14,000 m) with 1 mW radio power. Furthermore, we demonstrated that our method can achieve such long-distance communication at 10 BPS/1mW with battery cell operation in the SSB mode and that the SNR in the SSB bandwidth is better than -10 dB.

Poster: a construction of a long distance communication sensor network node using Arduino and Mad-SS shield

In this paper, we describe the construction of a long distance communication sensor network node for Arduino. We develop a Mad-SS Shield prototype system, which succeeds in about 5-km transmission with a 1 mW output.

A marine experiment of a long distance communication sensor network -MAD-SS-

We conducted long distance radio propagation experiments at 1-10mW/145MHz, to realize a low-power long-distance communication for wildlife research and disaster prevention telemetry. In this paper, we describe that we succeeded in long distance communications, from a ferryboat to the top of Mt. Asugiyama (elevation: 501m, distance: 15km) in Kure, Hiroshima, Japan, in the verification test of our method using 3W radio power. We found out that our method has sufficient capability to achieve such a long distance communication at 10BPS/10mW in battery cell operation on a marine, if we use SSB mode and the SNR in SSB bandwidth is better than -10dB.

WATERS DATA TREATMENT ON 3-DIMENSIONAL MEASUREMENT OF THE LANDFORM OF THE RIVERBED

3D laser scanner used on this study can not measure the landform under the water. However, the absence of data shows existence of the water in the other. It is important for the elucidation of the deformation mechanism of the riverbed to grasp the landform of the riverbed in detail. In this study, we tried to discriminate the water route from the measured data by using the trimming algorism and reflectivity. The shoal and water route was elucidated by an analysis of the trimming algorism and reflectivity. Some important characteristics of the waters area in measurement data of the landform of the riverbed by the 3D laser scanner were showed