SCUCLKERR - Determine the possible error in the times stored in the data header

Description:

This routine calculates the error in the times stored in the data header. It performs a self-consistency check to determine the local sidereal time from the Azimuth and elevation information (that comes directly from the telescope) and compares this to the LST stored in the header.

Usage:

scuclkerr filename

Parameters:

CLOCKERR = REAL (Write)

On exit, the clock error, in seconds, determined from the header.

DANG = REAL (Write)

Error in the array rotation angle due to the clock error (degrees)

DR = REAL (Write)

Positional error at the edge of the array for this particular observation. In arcseconds. Edge is defined as a radius of 70 arcseconds.

IN = NDF (Read)

The name of the NDF containing to be tested.

MSG_FILTER = CHAR (Read)

Message filter level. Default is NORM.

LAG = REAL (Write).

The discrepancy between the LST stored in the FITS header and the LST when data acquisition begins. This provides a measure of the lag in starting up the observation (including slew times). The value is stored in seconds.

MJD = DOUBLE (Write)

Modified Julian Date of start of observation corrected for the lag time and the clock error.

Notes:

• The calculated clock error is only accurate to about 15 seconds.

References

Jenness, T., 2000, JCMT Technical Report TR/001/84