Semi-real time tracking system of Japanese black bears using low earth orbit satellite communications

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  • 低軌道衛星通信を利用したツキノワグマ位置情報のセミリアルタイム送受信システムの試験
  • テイキドウ エイセイ ツウシン オ リヨウシタ ツキノワグマ イチ ジョウホウ ノ セミリアルタイム ソウジュシン システム ノ シケン

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Abstract

We tested the performance of a semi-real time tracking system of Japanese black bears Ursus thibetanus japonicus using a low earth orbit communications satellite (Whale Ecology Observation Satellite: WEOS) that was assembled from market products. The WEOS tracks bears using a collar transmitter that carries a data recorder for GPS position. The GPS positioning data is transferred when the WEOS is overhead of the collared bear. We first evaluated communication performance of a stationary transmitter on a flat area (sky view: 30.83%) and in a valley bottom (sky view: 28.39%), and then deployed a collar type transmitter on a free-ranging male bear. Visible passes of WEOS at each stationary sits were 5 to 6 times/day. Communication success ratios from the transmitter to WEOS declined at the valley bottom and the free-ranging bear than the flat land (72.5%: n&εθυαλσ;195). However, we confirmed that the data transmitted successfully 1.02 times/day. Assuming data transmission at each communication can be increased after this, the semi-real time tracking system using the WEOS will be very useful.<br>

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