Chapter 2 CPT7 Installation
CPT7 and CPT7700 Installation and Operation User Manual v9
32
Do not install the CPT7 near a heat source, such as vehicle exhaust.
If the CPT7 will be used in areas of extreme high temperatures, be sure to mount the CPT7
on a metal surface such as the NovAtel mount adapter or the metal vehicle chassis. This will
allow heat to leave the CPT7 through contact with the metal surface and allow more
optimized performance.
For the simplest configuration, align the connectors of the CPT7 with the direction of travel of the vehicle and
mount the base facing down (see
Figure 6: Default RBV Configuration
below) This coincides with X-axis
forward and Z-axis down, and the default RBV configuration is valid. Any other mounting requires a rotational
offset to be applied. See
on page 74 for more information.
Figure 6: Default RBV Configuration
The X, Y and Z axis are marked on the CPT7 enclosure.
The default RBV configuration is
SETINSROTATION RBV 180 0 90 3 3 3
.
Also, it is important to measure the distance from the CPT7 to the primary and secondary GNSS antennas (the
Antenna Lever Arms), on the first usage, on the axis defined on the CPT7 enclosure. See also
on page 161 for dimensional drawings of the CPT7.
Ensure the CPT7 cannot move due to dynamics and that the distance and relative direction between the CPT7
and both antennas is fixed. See
The closer the primary antenna is to the CPT7, particularly in the horizontal plane, the more
accurate the position solution.
Also, your measurements entered using the
SETINSTRANSLATION
command must be as
accurate as possible, or at least more accurate than the GNSS positions being used.
For example,
a 10 cm error in recording the antenna offset will result in at least a 10 cm error in the
output. Millimetre accuracy is preferred.
The offset from the CPT7 to the antennas, and/or a user point device, must remain constant
especially for RTK or DGNSS data. Ensure the CPT7, antenna and user point device are bolted in
one position perhaps by using a custom bracket.
2.10.1 Securing the CPT7
The CPT7 can be secured directly to the mounting surface or can be secured using the CPT7 Adapter Plate
(01020112).
Содержание CPT7
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