Services Tab
Revised 2017-08-31
GPS Settings
Drawing No. LP0997-C
- 126 -
Sixnet
®
Series SN/RAM
®
6000 & RAM 9000 Software Manual
When the GeoFence engine begins to build a fence, it will calculate an allowed Minimum Radius using an
accuracy figure based on an average of 200 location points acquired over an interval of 15-20 minutes. This
value is then multiplied by the Lockdown Radius Multiplier to obtain the Modified Minimum Radius.
The Modified Minimum Radius will not be allowed to be less than the Minimum Accuracy, and will be increased
to the Minimum Accuracy as needed. The Minimum Accuracy will also provide a lower limit for the Fixed
Lockdown Radius. The allowable range is 0-2000.
Fixed Lockdown Radius (Required):
The value of the Fixed Lockdown Radius may be entered in this field.
The recommended setting for this option is 0 (off).
GeoFence behavior can be described in the following ways:
•
Flexible radius
: To select this option, the Fixed Lockdown Radius must be set to
0
.
•
Flexible radius with additional fixed buffer:
To select this option, enter a value, preceded with ‘
+
’.
•
Fixed radius:
To select this option, enter any non-zero value.
During the establishment of a GeoFence, a set of 200 location points are obtained over a period of 15-20
minutes to determine an initial ‘minimum radius’ possible for the device. The Flexible radius behavior uses the
Calculated Minimum Radius
and the configured
Lockdown Radius Multiplier
values to set the GeoFence
boundary. Setting the
Fixed Lockdown Radius
to a positive offset (+20, for example) has the effect of adding a
fixed amount of buffer space to the
Calculated Minimum Radius
, and the
Lockdown Radius Multiplier
has no
effect.
For Fixed Radius behavior, the configured value for the
Fixed Lockdown Radius
is used to set an absolute
minimum radius for the GeoFence, subject to increase by the configured
Minimum Accuracy
or
Calculated
Minimum Radius
values as needed.
Note that since the calculated minimum radius may change over time depending on acquired GPS location
data, the value will never be allowed to become less than the
Minimum Accuracy
nor the
Calculated Minimum
Accuracy
.
GeoFence
Violation
Control
Number of Violations to ignore (Required):
Enter the number of violations to ignore in this field. The
recommended value for this field is 10-30 points (approximately 20-60 seconds).
To limit false alarms from occasional drifting GPS points, this value will ignore a certain number of anomalous
points before alerting a SixView Manager server. This prevents an inaccurate site from constantly updating the
SixView Manager with dubious information. New points are received about every 2 seconds. The allowable
range is 0-300.
Violation Grace Period (Required):
The value of the Grace Period may be entered in this field. The
recommended setting for this field is 60.
Once we have ignored the first few anomalous location fixes, points outside the GeoFence are considered a
violation. This timer specified (in seconds) how long to tolerate points outside the GeoFence boundary, before
declaring a full “Violation Outside” and enacting the “Violation Action”. The allowable range is 30-600.
Maximum Loss-of-data time (Required):
The maximum number of seconds for which no GPS data is
received may be entered in this field. The recommended setting for this field is 120.
Ordinarily, a GPS device generates location information updates on a continuous regular periodic basis. A loss
of these updates may be due to a temporary or intermittent reception issue, or due to the device having been
moved to an area devoid of GPS reception or disconnection or an external GPS receiver, either deliberately or
accidentally by persons authorized to do so or not.
This parameter sets the period of GPS data loss beyond which the device may be considered having been
tampered with and subject to securing actions. The allowable range is 30-1200.
