Global Position System Location Reports
How GPS and GO operate together:
Global Position System (GPS) works on a separate system from
the cellular network. The GPS is a network of approximately 30
satellites orbiting the Earth. Wherever anyone is on the planet,
at least four GPS satellites are ‘visible’ at any time.
Each satellite transmits information about its position and the
current time at regular intervals. These signals, travelling at the
speed of light, are processed by GO which calculates how far
away each satellite is based on how long it took for the
messages to arrive. Once GO has information on how far away
at least three satellites are, it uses a process called trilateration and finds a central location and
transmits these coordinates to monitoring GPS location software, or SmartCare Locate. The more
satellites there are above the horizon, the more accurately GO can determine its location.
During an alert GO will send through periodic GPS locations to SmartCare Locate, a purpose-built
website application, or to other monitoring GPS software. The interval between sending locations
can be configured in the GO configuration and is set in minutes. Typically, GO is set to send updated
coordinates every five minutes.
7.1 Rough GPS Location
Once the emergency alert is sent to monitoring, GO obtains the first GPS location and immediately
sends it, this is known as a ‘rough’ location. This is a single GPS location that has been obtained as
quickly as possible to give monitoring operator a good indication of the area where GO is located. If
GO has been learned into a base unit and is within range, then a ‘home’ report will be sent instead
of the rough GPS coordinate. GO will then continue to send smart GPS coordinates at predefined
intervals.
A rough GPS location will also be sent when a ‘GPS check’ is performed as part of the GO System
Check.
7.2 Smart GPS Locations
To improve GPS accuracy Chiptech has developed ‘Smart GPS’. The algorithm has been
designed specifically to improve GPS accuracy using statistical data analysis on multiple
GPS fixes, and the most likely location is sent.
All GPS data sent through after the initial ‘rough’ fix will be ‘smart’ fixes.
These calculations are accurate when the device is in a static position, and not travelling.
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