1. Pointing and Focus Corrections
汇报人：肖 明 (研究生2年) 邮
地 址：新疆天文台(202室)

2. THE PARABOLOIDAL REFLECTOR ANTENNA IN RADIO ASTRONOMY
Geometry of reflector antennas
Electromagnetic theory of the reflector antennas
Antennas’ characteristics in practical applications
(1).Aperture illumination
(2).Axial defocus
(3).Lateral defocus
(4).Aperture blockages
(5).Surface tolerance theory
Measurement of antenna parameters
(1).Pointing and focus corrections √
(2).Extraterrestrial sources as test transmitters
Miscellaneous subjects
(1).Holographic measurement
(2).Off-set aperture
(3).Atmospheric fluctuations

3. Pointing and focus corrections
Mono-pulse
The principle of the mono-pulse technique is simple. The feed-horns of the mono-pulse tracker are slightly displaced so that each receives the signal from a slightly different position, that is, at slightly different power.
Scanning
(1). Conical Scan (2). Lissajous Scan (3). Rosette Scan

4. Performance Evaluation
Encode position disturbances
(1). random disturbances (2). deterministic disturbances
Measured power disturbances

5. the Conclusion
They show that for frequencies higher that the scanning frequency the disturbances are quickly suppressed.

6. Next to talk about some SCIENCE

7. The Sunyaev–Zel’dovich (SZ) Effect in Cosmology and Cluster Physics
The Physics of the Sunyaev-Zel’dovich Effect
(1). Thermal SZ Effect [GBT]
(2). Kinematic SZ Effect [ALMA]
Observing the Sunyaev–Zel’dovich Effect √
Cluster Science from the Sunyaev–Zel’dovich Effect
Cosmology from the Sunyaev–Zel’dovich Effect

8. Much better results should be obtained using two-dimensional arrays of detectors, as should be available on the Green Bank Telescope when it is completed.
QTT

11. QTT XAO China
GBT U.S.
ALMA U.S. Japan Taiwan
ACT Penn. U.S.
APEX-SZ Berkeley U.S.
SPT Chicago U.S.
Higher sensitivity
Higher resolution

12. ● ● ? ● ●

13. Thank you !