The primary header keywords for monitor are as follows:
SIMPLE = T / file does conform to FITS standard BITPIX = 8 / number of bits per data pixel NAXIS = 0 / number of data axes EXTEND = T / FITS dataset may contain extensions COMMENT FITS (Flexible Image Transport System) format defined in Astronomy and COMMENT Astrophysics Supplement Series v44/p363, v44/p371, v73/p359, v73/p365. COMMENT Contact the NASA Science Office of Standards and Technology for the COMMENT FITS Definition document #100 and other FITS information. ORIGIN = 'NRAO Green Bank' / INSTRUME= 'ActiveSurfaceMgr' / device or program of origin GBTMCVER= '3.12' / telescope control software release FITSVER = '2.4 ' / FITS definition version for this device DATEBLD = 'Wed Feb 19 20:15:13 GMT 2003' / time program was linked SIMULATE= 0 / Is the instrument in simulate mode? DATE-OBS= '2003-02-20T17:15:51' / Manager parameter startTime TIMESYS = 'UTC ' / time scale specification for DATE-OBS TELESCOP= 'NRAO_GBT' / Green Bank Telescope (Robert C. Byrd 100m) OBJECT = 'test ' / Manager parameter source PROJID = 'test ' / Manager parameter projectId OBSID = 'test ' / Manager parameter scanId SCAN = 1 / Manager parameter scanNumber FEMFILE = 'femA59wM95bG.fef' / FE model filename or NONE if not active FEMELEV = 4.550000E+01 / Elevation used for FEM calculations NBAD = 0 / Number of disabled actuators NACTIVE = 2209 / Number of active actuators MEAN = 0.000000E+00 / Mean (cmd-ind) of active actuators STDDEV = 0.000000E+00 / Std deviation of non-disabled actuators GINIMD = 0.000000E+00 / Gini's mean diff of all actuators WINSK = 0 / Winsor k value used for WINSRMS WINSRMS = 0.000000E+00 / Winsorized RMS of all actuators IQRSTDDV= 0.000000E+00 / Interquartile stddev of all actuators ZERO = 1 / correctionSelect,zero parameter value FEM = 1 / correctionSelect,fem parameter value RANDOM = 0 / correctionSelect,random parameter value ZERNIKE = 1 / correctionSelect,zernike parameter value ZERNGMOD= '2005WinterV2' / selected zernike gravity model or NONE ACTZEROV= '1.3 ' / Actuator zero point file revision END
There are ten non-standard GBT keywords: FEMFILE, FEMELEVA, NBAD, NACTIVE, MEAN, STDDEV, GINIMD, WINSK, WINSRMS, IQRSTDDV, ZERO,FEM, RANDOM,ZERNIKE,ZERNGMOD and ACTZEROV.
FEMFILE is a string that indicates the filename from which the model used by the Active Surface Manager was extracted. The "fem" prefix of the filename is a general classification code for the file, which indicates that it contains the FEM. The next four characters of the filename refer to the alidade model; in this case, the alidade model is A59w. The next four characters identify the tipping structure model; in this case, the tipping structure model is M95b. The final character provides additional information about the model. The choices for the last character are "f" for a full asymmetrical model, "G" is for gravity models, "E" for eigenvector models of vibrational modes of the structure, "S" for special static force models, or "GE" for gravity models that contain eigenvectors.
FEMELEVA indicates the elevation of the antenna that was used as input to the FEM calculations. Currently, this is the antenna elevation for the midpoint of the scan.
NBAD indicates the number of disabled actuators during the scan and NACTIVE indicates the number of enabled actuators during the scan. These two numbers should always sum to 2209.
MEAN is the conventional mean of all non-disabled actuator (NACTIVE) residuals. STDDEV is the conventional standard deviation of all non-disabled actuator (NACTIVE) residuals.
GINIMD is the Gini's mean difference of all actuator residuals.
WINSRMS is the Winsorized mean difference of all actuator residuals. WINSK is the "k" value used in calculating the Winsorized mean difference. Note that WINSK should be the same value as NBAD.
IQRSTDDV is the interquartile range standard deviation of all actuator residuals.
ZERO, FEM, RANDOM, and ZERNIKE are boolean values indicating whether or not the actuator zero point, finite element model, random displacement and Zernike corrections were selected in the manager. (A 1 indicates the module was selected or 'on'.)
ZERNGMOD documents which Zernike coefficient model was selected.
ACTZEROV documents the CVS revision number of the actuator zero point file (usually named SurfaceActZeros.conf).