Note: If a System parameter tab is not shown in the device, it will be set to defaults. This is the same as showing the tab and not changing any values.
The Bolt’s tracking centres on the concept of a trip. When not in a trip and otherwise idle it sleep and generate heartbeats. These are regular health checks that log a telemetry record and do an upload. The default period is 1 hour.
PDOP, Position & Speed Accuracy: These settings allow you to configure the minimum accuracy accepted for a fix. The PDOP is a measure of how imprecise a GPS fix is. This is due to the satellites that are used being too close together to triangulate effectively. Please note that values lower than 2.0 for PDOP will be difficult to achieve in practice. Default Position Accuracy is 50 metres.
Static Hold: If a device is measured to be going less than this speed, it will set it to stationary and it's position fixed.
GPS Model: This selects a statistical module used by the GPS hardware when filtering out noise during GPS fixes. Generally choose Automotive
Discard First N Fixes: This option discards a configurable number of points from the GPS if the PDOP is above 2.3. This gives the GPS some time to improve its accuracy, and lowers the chance of outlying GPS fixes slipping through the filters.
There are a number of different trip types but the Bolt only uses Movement based trips also known as emulated ignition. If the device detects GPS movement beyond a configurable threshold (150m by default), it will begin tracking a trip. The trip is typically ended when it has not moved for a configurable period (4 min by default).
If the distance between the last logged point and the current position exceeds Distance (m), then log a new point with log reason “distance”.
Heading change logs are split into short and long heading changes to minimise points in large heading changes in a small distance and are logged use the log reason “heading change”.
If the distance since the last logged point is greater than Heading Change Distance (m) log a point if the heading changes by more than Heading Change Short (deg).
If the distance since the last logged point is less than Heading Change Distance (m) log a point if the heading changes by more than Heading Change Short (deg).
This setup allows accurate reproduction of corners and bends without excessive data use.
If the speed of the device changes by Speed Change (km/h) since the last logged point, log a new point with log reason “speed change”.
Set Stationary to Yes to log a point when the speed reaches 0 km/h. This results in a “stationary” log reason
The threshold for harsh driving vary between different vehicle types. A large truck and a motorcycle will require very different thresholds. The thresholds should be configured in system parameters on the OEM Server.
As a guideline:
- Defaults: acceleration and braking 4.4m/s^2. Cornering 5.5m/s^2. These are set high to log a minimum number of events on most vehicles.
- Testing: artificially low to generate events. Acceleration and braking 3.0m/s^2. Cornering 3.5m/s^2
- In practice: choose levels between the defaults and the testing levels.
Digital Input: Select a digital input to log records to
Idle Time Threshold (s): after this time has elapsed of the device being lower than the idle speed threshold (km/h) set Digital Input N to 'On'
Record the external power voltages to a digital input
Option to record when the external voltage exceeds a threshold
The GPS module reports whether jamming has been detected or suspected by the receiver. The jamming status sets a configurable digital input. The detector monitors background noise and looks for significant changes, which may indicate jamming. These settings can be configured to record on a Digital I/O by using the follow parameters tab.
Enable or Disable ability to send APN SMS commands
Accident Logging allows 3 levels of logging.
- Off (default): results in no detection and automatic upload of reconstruction data. Reconstruction data can still be requested by an async message.
- Accident Log Reason: logs only the accident record and no reconstruction data.
- Accident Log Reason & Reconstruction Data: logs the accident record and reconstruction data.
Accident Delta-V Threshold is the magnitude of the change in 2D velocity over 120ms that will trigger an accident. The units are km/h. The default is 7km/h. This corresponds to 1.6G over the 120ms period.
Disable Orientation allows the advanced accelerometer features (roll detection, driver profiling, and drop detection) to be disabled.
Disable Vertical Accident Filtering allows the drop notification to be disabled.
Wakeup Threshold and Wakeup Count relate to the accelerometer's sensitivity to movement that will wake the device up or keep it awake. Generally, the defaults of 1 and 0 respectively should be used.
This records into the Device Telemetry