USER MANUAL
Page 68 of 86 URM18PH392 Rev A. May 2020
Azimuth The coordinate of orientation tracking in the horizontal plane. Azimuth is a rotation
around the Z (vertical) axis, where an increase in the angle is clockwise when viewed in
the positive direction along this axis. Note, in Polhemus’ default frame of reference, the
+Z axis points down, with +X pointing forward and +Y pointing to the right. The term
“yaw” is often substituted for azimuth, especially in the context of flight.
Baud Rate The signaling rate on a serial line. For example, to convey an 8-bit byte normally
requires at least two additional bit times, a start bit and a stop bit so that
synchronization is possible without a separate clocking line. For example, such an
arrangement implies for a 115200 baud rate conveyance of data at a 115200*8/10 =
92,160 bit rate.
Benign Environment A tracking environment free of the need for special calibration or compensation brought
on by the unique features of a particular installation and its environment (e.g. high light
levels for optical tracking, high sound levels for sonic tracking, or high metallic distortion
for magnetic tracking). If not otherwise noted, all measurements and statements
pertaining to VIPER™ performance shall be regarded as occurring in such a benign
environment.
BIT Built-In Test features in the VIPER™ system firmware monitor the status and health of
the VIPER™ system and flag certain preset conditions; not to be confused with “bit,” a
contraction of “binary digit.”
Boresight Any procedure that rotates the Sensor frame so as to precisely align the Sensor to the
designated reference frame.
In a VIPER™ system context, the term usually refers to the system software routine that,
on command, performs a coordinate rotation, which effectively aligns the Sensor frame
to a predefined boresight reference orientation, e.g. the Source reference frame.
Cartesian Coordinates In three dimensions, three numbers that indicate the location of a point relative to a
fixed reference point (the origin), being the shortest (perpendicular) distances from
three fixed and orthogonal axes which intersect at the origin.
Degree A measurement of a plane angle, defined so that a full rotation is 360 degrees. A full
rotation equals 2π radians; therefore, one degree is equivalent to π/180 radians. See
also Radians and Orientation Angles.
Digitizer A special Sensor, shaped like a pen or Stylus, used for recording the X, Y, Z coordinates
of an object; easily captures data points in hard to reach places; requires no mechanical
arm or optical markers.
Direction Cosines The cosines of the angles between the Sensor’s x, y, z axes and the X, Y, Z axes of the
measurement reference (alignment) frame.
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