Abstract:
THE PRINCIPLES OF THE CONSTRUCTION OF CCD CAMERA FOR FUNCTIONING IN THE 
REAL TIME AT THE BELGRADE LARGE TRANSIT INSTRUMENT
S.M. Petkovic and I.Pakvor
Astronomical Observatory, Volgina 7, 11050 Belgrade, Yugoslavia

The possibilities of CCD sensors and the following hardware for 
comparison of the local time t(UTC) with the position of star-image in 
the pixel matrix of the sensor are analysed. It is shown which data are 
necessary for this comparison as well as the organization of the 
necessary hardware.
Functioning in the real time during star observations at the Large 
Transit Instrument (LTI) supposes the establishment of the correspondence 
between each illuminated pixel of CCD sensor and time t(UTC) obtained 
from the local T/P standard. The moment of illumination of each individual
pixel, the interval of integration time of the illuminated 
pixel,intensity of the illumination, velocity and direction of 
star-image motion across matrix of pixels and jitter of the star-image 
are the basic parameters (excluding LTI instrumental errors) for time 
determination of meridian passages.