Fixed az driftPattern at transit


    The fixed azimuth drift routine within cima is used  for various drift surveys. It allows you to start a drift scan at a particular az and declination. To use the routine:

Users have been having trouble with the fixed drift routine when observing declinations close to that of the AO lattitude (18:21:14.2). The problems are:
The problem occurs because the declination strip of a source across the dish may cross the same azimuth twice (at different za's and hour angles). This occurs when the source declination is close to the lattitude of ao.

    The plot shows  the za,vs azimuth for sources close to the ao lattitude (.ps) (.pdf):
processing: x101/100329/