International Journal of Antennas and Propagation / 2018 / Article / Tab 5

Review Article

Active Surface Compensation for Large Radio Telescope Antennas

Table 5

Design parameters of GBT actuators.

Stroke51 cm
Positioning accuracy25 μm
Speed250 μm/s
Static load481 kg
Dynamic load186 kg
Service life20 years, 1270 meters per year
Type of motorDC brush motor
Position sensorLinear variable differential transformer (LVDT)