Battery Powered Devices - Overview of Operations

Types of Tracking

Movement based/Trip Tracking:

Our devices revolve around the concept of 'a Trip' for their tracking, and there are several ways you can commence and end a trip.
There are multiple methods of beginning and ending trips on our battery powered devices; 'Standard' GPS Tracking, Jostle mode and Turn by Turn Tracking for the Falcon.

Periodic only tracking:

You can also disable trip tracking and get heartbeats only - i.e. update every 12 hours. This is called periodic only tracking in the battery powered and Narrowband low power (Sigfox/LoRaWAN) product ranges.
You can use the Periodic tracking mode to give you a position update on an interval (i.e. once daily) for greater battery life.

Note:

This mode will disable any Trip based parameters such as "In Trip Logging/Upload"

 Wired Devices

For Wired Device Overview of Operations click here


Trip Tracking Modes

Digital Matter devices revolve around the concept of 'a Trip' for their tracking, and there are several ways you can commence and end a trip. There are multiple methods of beginning and ending trips

  1. 'Standard' GPS Tracking
  2. Jostle Mode
  3. Turn by Turn Tracking

Standard GPS Tracking:

This is the default tracking mode on all battery powered cellular devices aside from the Yabby.

  • The device waits in a low power sleep state for accelerometer activity.
  • Once woken by accelerometer movement, it checks the GPS for movement over a period of a few seconds. 
  • If the device is being repeatedly woken up by accelerometer movement, but there is no GPS fixes, it wakes up on a timer every few minutes instead (to save battery)
  • If the GPS shows movement over the start threshold (250m by default), a trip is started.
    • Once in trip, the accelerometer is turned off
    • It wakes up every few minutes and gets a fix
    • It checks the trip is still in progress by looking at the fix
    • When the fixes suggest movement has stopped, it ends the trip
    • If GPS signal is lost for some time the trip ends also

By default, fixes and uploads occur:

  • At the beginning of a trip (Fix and Upload)
  • Every 2 minutes during trip a fix is attempted and logged
  • Every 30 minutes, new fix is acquired and all stored fixes are uploaded
  • End of trip (fix and upload)

Jostle Mode

(Available on all battery powered devices. This is the only mode available on the Yabby GPS and WiFi)

In Jostle mode, the device uses its accelerometer to detect movement. Operation is as follows:

  • Accelerometer wakes the unit
    • By default, a wake filter is applied. The filter only starts a trip when it has seen 1 second’s worth of above-threshold movement in a 4 second period, or repeated short movements over several 4 second periods. Disabling the filter results in any accelerometer movement above the Wakeup Threshold (in Accelerometer Settings section of System Parameters) waking the unit.
  • Unit immediately determines it is moving – this is the same as entering a trip.
  • Once moving, the accelerometer no longer wakes the unit
  • It wakes every two minutes on a timer, and does two things:
    • Asks the accelerometer if there was any movement in the last 2 minutes
    • If it is time to log a position, it gets a fix and records it
  • Once the accelerometer claims there has been no movement for a while, (default is 5 mins - Movement End Time parameter), the device declares movement has stopped.
  • If the device also has a GPS, it will also wait until the speed reported by the GPS has dropped to 0, to prevent movement ending when the movement is very steady and constant – e.g. a train where acceleration is minimal

Turn by Turn GPS Tracking

(Falcon only)

Once the device determines it is moving, via either wired ignition or emulated ignition, this mode enables a change of behaviour so instead of turning the GPS on, achieving a fix, turning off and uploaded the data then waiting until the next logging period has elapsed, the device will:

  • Leave the GPS on to get fixes easier
  • Keeps the modem communicating and uploads each fix immediately after it qualifies as a valid fix

This mode operates in the same way as our other powered devices e.g. Bolt, Dart2, G62, G120. It uses quite a lot of power comparitive to the other modes so should only be used when the Falcon is hard-wired to external power.

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