Leica Geosystems GPS System 500 - Technical Reference Manual - Manual (Page 64)

64 2. Set-up and Connection Technical Reference Manual-4.0.0en
2.15.1 Mechanical Reference Planes
The Mechanical Reference Plane or datum to which the
Antenna Height is measured and from which the Phase
Center Eccentricities are calculated is shown for each
Leica System 500 Antenna.
AT501 and AT502
The Mechanical Reference Plane is the underside of the
threaded metal insert.
AT503
The Mechanical Reference Plane is the underside of the
Antenna itself.
MRP
AT504
The Mechanical Reference Plane is the underside of the
Preamplifier Housing. The AT504 is built to a JPL design
specified by the IGS for Reference Stations. The Me-
chanical Reference Plane is always referred to as the
Bottom of Preamplifier or BPA by the IGS.
MRP
0.0345m
0.1897m
MRP 0.1501m