TrueView 435 Hardware User Guide
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TrueView 435 Hardware User Guide
10/26/2021
Z Offset
The Z offset is the distance from the APX-15 to the GNSS antenna phase center in the up/down
direction. If the GNSS antenna is above the APX-15, the offset is negative. If the antenna is below the
APX-15, the offset is positive. The reference point for Z will be the top of the bottom aluminum
mounting plate (Figure 54) where the cameras are attached. The APX-15 is 1.644cm above this plate.
A tip for measuring Z is to install the TrueView and GNSS antenna on the aircraft and place it on a table.
Measure from the bottom of the antenna (Figure 55) to the table, then add 3.7cm to this measurement.
3.7cm is the offset from antenna phase center to the bottom of the antenna. Then measure up from the
table to the aluminum plate. Subtract the distance from the table to the plate, then subtract 1.644cm
to get the distance from antenna phase center to the APX-15.
Figure 54
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TrueView 435 measurements
Figure 55
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Bottom of GNSS antenna