A chord-angle method is proposed for the precise optical measurement of the surface contour of large and medium size
paraboloid antenna. The possible errors of the proposed method are theoretically analyzed as a whole. The antenna
surface measurement precision is controlled and adjusted by measuring the angle and chord length of the measuring
target point on the antenna surface. The effectiveness of the proposed method is verified through measurements.
Experimental results indicate that the chord-angle method is effective and it has wide application prospect. Compared to
the conventional template method, this direct measurement method has higher precision and better applicability.
In order to do the systematical dynamic modeling and analysis of the Ku-band 16meter antenna satellite ground station
used a satellite telecommunication, We calculated the eigenvalues of the the Ku-band 16meter antenna structure, and
used the SAP5, a large structure analysis software, to do the finite element calculation and analysis. The first ten band
eigenvalues of the antenna structure were calculated; And the results showed that the minimum natural frequency was
2.075 Hz. Furthermore, based on National Military Standard, we measured the system frequency of the Ku-band 16meter
antenna satellite ground station and got the minimum natural frequency of 2.249Hz. So there is quite good agreement
between the theoretical minimum natural frequency (2.075 Hz) and the measuring minimum natural frequency
(2.249Hz). This shows that dynamic modeling and analysis of a large-scale antenna structure system is effective.