International Journal of Antennas and Propagation / 2018 / Article / Tab 1

Review Article

Active Surface Compensation for Large Radio Telescope Antennas

Table 1

Traditional methods of antenna surface measurement.

MethodsMeasurement accuracy/mmScope of application

MechanicsTemplate method±0.1~0.2It is only suitable to measure the antenna in elevation and more effective for the installation and detection of small and medium antennas.
Lathe method±0.02~0.1It is only suitable for measuring small antennas (the diameter should be less than or equal to 4 m).

OpticsTheodolite and steel tape method<±0.2It is widely used.
Double pentaprism method±0.15~0.66It can measure the surface accuracy of paraboloid at different elevation angles.

OthersPentaprism and tape method, steel wire ranging method, car measurement method, etc.