Internal sensors

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Wild
life

Internal sensors

Animal positioning (GPS)

The position of the animal is obtained in WGS84 coordinates by GPS (Global Positioning System). Every position is stored with date and time, latitude, longitude,height, DOP, 2D/3D/3D validated navigation, number of used satellites, satellite PRN code and carrier to noise ratio, main and VHF beacon battery voltage, and temperature.

You can create a highly flexible schedule for GPS fixes. In addition, the features Virtual Fence and UHF ID Tags allow you to change to alternate GPS schedules. All GPS schedules are programmed in VERTEX Plus and are built with one or more rules specifying the date and time when the appropriate sensor of the collar will be active. Each schedule consist of a varying set of rules:

GPS position chart
GPS position chart
  • Start Date: The date when the rule should start
  • End Date: The date when the rule should end
  • Period Length: The length of the period in which the Sequence for recording is repeated
  • Sequence: The sequence is a time span within the period length in which you like to record data. Here you can define:
    • Offset: It defines the time span between the start of the period and the first recording of data
    • Duration: Period in which the data will be recorded with the Rate repetition
    • Rate: Data recording repetition rate

GPS Schedule
GPS Schedule

Activity Sensor (before 2015)

GPS fixes can give valid information on locomotor activity of animals, but there are two major problems:

  • especially in small animals GPS fixes are hours apart, so a fine-scale picture of resting/activity cannot be obtained
  • GPS fixes have an inherit error which even with short fix intervals might give the impression that a resting animal is moving around

Activity sensor axis
Activity sensor axis
The three-axes acceleration sensor, which can be integrated into all VECTRONIC collars, provides fine-scale data on animal motion, adding new pieces to the puzzle of animal behaviour studies.

True acceleration is measured continuously on three axes, and stored either as mean activity of the X- and Y-axis, ratio of acceleration above a user-defined threshold on all axes, or related to a user-defined head angle (tilt sensor). These values are stored in user-defined intervals between 64 and 896 seconds (app. 1-15 minutes).

Activity values can be downloaded remotely via UHF or VHF data communication, or via Link Manager after the collar has been retrieved. The data sets can be easily exported as text file for further analysis.

Activity sensor angle
Activity sensor angle
Fast access to the activity data is provided by the free PC based Activity Pattern software. Developed in close cooperation with researchers, this program uses methods currently used in the field of telemetry aided behavioural biology. It allows you to study basic activity patterns, but also to zoom into activity rhythms.

Please check New High Resolution Activity Sensorfor details on our newest sensor.

Actogram
Actogram

Applications

  • Daily Activity Patterns: Identify regularities in daily activity patterns, find resting times and activity peaks.
  • Seasonal Activity Patterns: Find out how activity changes during the seasons in regard of intensity, pattern and rhythmicity.
  • Periods of Interest: Use actograms to easily find periods of special interest, e.g. rut or times of reduced activity.
  • Animal Well-being: Find aberrations from the normal activity pattern and calculate Degrees of Functional Coupling (DFC) to assess animal welfare during your study time (e.g. during open hunting season, heat stress).

A subsumed version of these features you find here in Flyer:
Activity Pattern – analysis software for the activity sensor

Statistical activity chart
Statistical activity chart