FASTRAK MANUAL
Rev. G
C-7
JUNE 2012
System ID Data
Thirty-two characters of ASCII data (hardware serial number, etc.) stored
in EEPROM containing information identifying the system. See ‘X’
command.
Tracker
Alignment
The process whereby the tracking system coordinate reference is brought
into coincidence, either physically or mathematically, with other
coordinates of the environment.
Tracker
Calibration
The process whereby the tracking system is made to operate accurately in
the installed environment to produce tracking data throughout the motion
box.
Tracker
Latency
The interval of time between when tracker measurement data were
collected and when the P&O result is formatted ready for transfer to the
host computer. In some systems, namely active trackers, there is a timer
interval when the active element is illuminating the environment when the
data are collected after which the P&O computation can be done. Hence,
this definition is intended to correspond to the center point of data
collection time so that tracker latency is straightforward and
understandable as stated. Other tracking systems (e.g., inertial) may
produce raw data continuously or nearly continuously. Tracker latency in
this case reduces to the computation time for producing the answer ready
for transfer to the host computer.
Tracker Response
The interval of time between a request to the tracking system to collect a
data point and when that data is available for input from the tracker.
Transmitter
The transmitter generates the low-frequency magnetic field measured by
the receiver. The transmitter’s X, Y, and Z-axes are the default
measurement reference frame.
Units
The unit of assumed distance. The 3SPACE allows either inches or
centimeters.
Update
Rate
The rate at which motion-tracking data can be made available from the
tracking system.
Useful
Range
The maximum distance at which the resolution and noise performance of
the tracking system can be realized.