GPS Collars (GSM)
Cellular collars consist of a Hawk105 (GPS - GSM) device that
calculates the animal’s coordinates using a GPS. This data
is then sent via the GSM network as a text message (SMS) that
you can download from the internet using HAWK software.
unit can also provide temperature readings at specified time intervals.
For advanced users we even provide the option of downloading data
on the accuracy of individual fixes, including details on 2-D
/ 3-D readings and the positional dilution of position (PDOP).
The data is stored on a secure database and you can download this
whenever required. There is the option to change the frequency
and schedule of readings by sending a text message (SMS) to the
unit. Doing so you can specify time intervals for your data, such
as hourly readings, from 6am and 6pm or for specific times during
consumption of the unit varies depending on the number and frequency
of readings you need – we estimate a battery life of 5 readings
per day for 2 years for each ‘D’ size battery. The
number of batteries you can specify for a unit depends on the
size, age and species of animal that you want to track.
an animal moves out of cellular coverage a beacon (RF) transmitter
is activated automatically, letting you locate it using standard
radio tracking techniques.
can also arrange for a data logger to be attached to the unit
so that readings are taken and saved even when there is no cellular
coverage. Later these can be sent on when the animal moves back
into an area with cellular coverage. The data logger can store
20 000 readings on non-volatile memory, meaning data cannot be
lost when the batteries eventually fail.
Viewing on Google Earth
Collar data can be viewed on Google Earth so one can see exactly
where the animals were with very high resolution satellite imagery.
collars have three extra functions that can be activated by the
user. This consist of Forwarding, the “Where is” function
and Zones function.
The Forwarding function allows the user to receive a text message
(SMS) on their mobile phone with the GPS coordinates of the unit
as soon as it is sent by the unit.
“Where is” function
The user sends a text message (SMS) from a mobile phone such as
“Where is Unit x” and they receive a text message
with the animal’s latest GPS location.
No-Go or alert zones can be drawn on a map using the HAWK software
and whenever the unit sends a GPS location from outside zone,
the user will be alerted immediately via text message (SMS). One
can choose two types of zones, normal zones and emergency zones.
A “Normal Zone” violation will notify the user by
text message (SMS) and the “Emergency Zone” will notify
the user by missed call and text message (SMS) and the user will
also receive a phone call from the data control centre.
Tags & Receivers system consists of two parts. The first is
a digital tag receiver mounted on a collar with a GPS device that
determines it’s position to within 5 meters. The second
part is the tags with unique ID numbers and temperature sensors.
The tags can be mounted onto animals by various means due to their
small size (e.g. collars or implants). At schedule reading times
the digital receiver records its exact GPS location as well as
the location (direction from unit) and distance (in terms of signal
strength) of each tag within range. The signal strength is only
to be used as a rough indicator of distance from the receiver
unit as the animal itself, as well as the environmental conditions
& surroundings can affect signal strength. The tags’
battery life is estimated to last approximately 3 years on one
penlight lithium battery.
data from each scheduled reading is then saved onto a Data Logger
that can store up to 20 000 readings. The data can be transferred
to the uses via GSM network (if the receiver is attached to a
Cellular collar) or via Satellite (if the receiver is mounted
on a Satellite collar) or stored on a Data Logger Radio Collar
and retrieved by locating the unit by means of radio tracking
and manually removing the collar after a specified time period.