Satellite radio tracking of polar bears

摘要

The entire transmitter package weighed under 5 kg, making it smaller and lower in power than other Nimbus 6 transmitters. The design also included a loose-fitting, urethane neck collar design that would withstand the bear's abuse. The upper section of the collar contained the antenna, which would radiate a hemispherical pattern. A lexan box was used for the satellite communications electronics. The lower section of the collar (under the bear's neck) contained an 11-V lithium battery pack. In expanding the project, 11 bears, divided into three groups, were fitted with transmission collars and released at various points throughout Alaska, Canada, and Greenland.