Lithium Ion Polymer
cells are used as batteries, and a solar array is used for powering the Lithium
Ion cells.
Application-specific Requirements
Some of the main design requirements of the ZebraNet project, as per the
wildlife biologists are as follows:
1. GPS position samples should be taken every three minutes, and detailed
activity logs for three minutes should be taken every hour. The latency of
this data is not important, however the packet delivery rate to the sink
should be almost 100%.
2. There should be no direct human intervention for at least one year.
3. The architecture should not have any fixed sinks, and must cover a wide
range of open land.
4. The weight of the ZebraNet collar should not be more than 5 lbs. For
animals smaller than the zebra, the weight restrictions may be lower.
Design Problems
Based on the requirements stated above, the ZebraNet project can be considered
to be a data gathering or a wide-area tracking application. The collection
and delivery of the data is of primary importance, while packet delay is not
such an important concern. Also, the vast habitat of the zebras has to be
monitored in a non-intrusive fashion. These application-specific constraints
motivate the following design issues:
1. Data Gathering Protocol: The objectives of the ZebraNet project are
similar to those of the SWIM project. Hence, the ZebraNet collars use a
data gathering protocol similar to that used in SWIM.
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