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6.3 Key terms
Accelerometer
: The device built into your Quantum 4000 Enhanced GPS unit that
detects movement and its intensity.
Amplitude threshold
: This is a filter. It is the user programmable activity level that
must be exceeded in order for the activity to be included in the data output.
Buffer flush
: When enabled, lines of activity data are moved out of the buffer and into
the nonvolatile memory either when the GPS receiver turns on to attempt a location or
when a wireless connection is made to the unit. When the buffer flush is not enabled the
activity data moves out of the buffer and into the memory only when the buffer is full.
The buffer fills at 62 lines of data. This feature is designed to make testing the activity
sensor simpler by allowing you to force the activity data to be written into memory and
avoid waiting hours for the buffer to fill up.
Cnt_threshold
: This is the third column in the output data. This represents the number
of instances, within a delta time period, that the activity sensor detected movement which
was greater than the amplitude threshold.
Delta time period
: The user programmable period of time, in seconds, that represents
one line of data.
Energy
: This is the fifth column in the output data. This represents the total intensity of
all movement within a delta time period.
Energy divider
: This is a filter. It is the user programmable number (between 30 and
255) that makes the energy output data more manageable. It does not filter the energy, it
just affects the numerical reading that is assigned to energy.
Max_amplitude
: The fourth column in the output data. It is the single instance, within a
delta time period, of the strongest acceleration of any movement within that delta time
period. Please note that this output is automatically filtered by dividing the output by 4.
Again, this is only to make the data more manageable.
Sample rate
: The interval at which the activity sensor functions, detecting or not
detecting movement.
Smart GPS threshold
: This is a user programmable setting. This has to do with
movement levels or intensity of movement. When the user-programmed level is
exceeded x number of times, then smart GPS is disabled and the position attempt is
allowed. This works in conjunction with the smart GPS minimum count.
Smart GPS minimum count
: This is a user programmable setting. It is the number of
occurrences that the smart GPS threshold must be exceeded in order for Smart GPS to be
disabled and a GPS location attempt to take place. This works in conjunction with the
smart GPS threshold.
Smart GPS counter
: This is not displayed but rather it keeps count of the number of
instances that movement has exceeded the smart GPS threshold.
Summary of Contents for 4000 Enhanced
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