FIRAS Explanatory Supplement Appendix I FIRAS ASCII Format Reference Datasets This appendix contains the following FIRAS ASCII Format Reference Datasets FEX_GLTCHCOR.TXT Glitchrate correction parameters FEX_VIBCORRL.TXT Vibration correction frequency offset indices FEX_CMDGAIN.TXT Actual values of commanded instrument gains FEX_SAMPRATE.TXT Mirror Transport Mechanism sampling rate FEX_MTMSWEEP.TXT Mirror Transport Mechanism scan times FEX_CTH.TXT Coaddition consistency check thresholds FEX_MINCOADD.TXT Minimum number of IFGs FEX_GRTCOAWT.TXT GRT weights for coadded IFGs FEX_GRTRAWWT.TXT GRT weights for raw IFGs FEX_GRTTRANS.TXT GRT low/high current transition temperatures -------------------------------------------------------------------------------- ! ! Reference Dataset FEX_GLTCHCOR Text File: ! Glitchrate correction parameters ! ! This file contains the glitchrate correction slopes and intercepts ! for the FIRAS data. These corrections were computed for each channel ! and scan mode by a linear least squares fit to the average variance and ! glitch rate of each calibrated sky spectrum. The average variance for ! a spectrum is defined to be: ((Nifgs * Real_Var) / D-Vector^2) / Nfreq. ! ! These corrections are used in the following manner: ! Nifgs' = Nifgs / (Intercept + Slope * Glitchrate) ! ! The spectra used in these computations were calibrated with the ! F16_93HYBRID calibration model solutions. ! ! For each row above, entries are in the order short slow, short fast, ! and long fast. ! ! ! Author: Gene Eplee ! General Sciences Corp. ! 513-7768 ! 2 December 1993 ! SER 11702 0.3181130953125 0.2140692412586 0.0966526586767 ! RH slopes 1.4352805363822 0.8577051984544 0.5659091990933 ! RL slopes 1.5191090347109 0.7266698341443 0.2082700179341 ! LH slopes 0.9033791223006 1.1911192067644 0.7500055772031 ! LL slopes 0.8077706519285 0.8747664977663 0.9388613541838 ! RH intercepts 0.4982031329753 0.7114551425149 0.8027039679998 ! RL intercepts 0.8917235659124 0.9526830996467 0.9840390263056 ! LH intercepts 0.6036605718068 0.6089863134529 0.6825380479394 ! LL intercepts -------------------------------------------------------------------------------- ! Reference Dataset FEX_VIBCORRL Text File ! ! This file contains the frequency offsets for which FSL corrects voltage ! spectra for MTM vibrations. The coefficients of the vibration ! correction terms are contained in the calibration model solution. ! The vibration frequencies are based on an FFT length of 720. ! ! The first two lines are primary offsets for the following channels and ! scan modes: ! ! RHSS RHSF RHLF RLSS RLFS/FL RLLF ! LHSS LHSF LHLF LLSS LLFS/FL LLLF ! ! The next two lines are secondary offsets in the same order. ! ! Author: Gene Eplee ! General Sciences Corp. ! 182.486 121.657 121.657 26.373 17.582 70.327 182.486 121.657 121.657 26.373 17.582 70.327 26.373 17.582 17.582 182.486 58.343 233.372 26.373 17.582 17.582 182.486 58.343 233.372 -------------------------------------------------------------------------------- ! ! Reference Dataset FEX_CMDGAIN Text File: ! Actual values of commanded instrument gains ! ! Purpose: To be used for making a reference file containing the commanded ! gain values for the four bolometer preamps. The data will be used ! to normalize IFGs. These gains were obtained from: ! John Sutton, Code 728.1, x6-5454 ! ! The gains are listed in columns below for each channel in the order ! RH, RL, LH, and LL. ! ! Written by: Gene Eplee ! Applied Research Corp. ! 286-2437 ! 30 Nov 1988 ! 1.000000 1.000000 1.000000 1.000000 2.999940 2.999860 2.999739 2.999850 10.00000 9.998940 9.998640 9.997999 29.99940 29.99542 29.99331 29.99250 100.9165 100.8180 100.9243 100.8040 302.7434 302.4399 302.7466 302.3967 1009.165 1008.073 1009.106 1007.838 3027.434 3024.078 3027.054 3023.364 -------------------------------------------------------------------------------- ! ! Reference Dataset FEX_SAMPRATE Text File: ! Mirror Transport Mechanism sampling rate ! ! This file contains the MTM sampling rates for both I&T and on-orbit ! data. ! ! Author: Gene Eplee ! General Sciences Corp. ! 513-7768 ! 25 June 1992 ! SER 9859 ! 673.29 ! I&T MTM Sampling Rate 681.43 ! Mission MTM Sampling Rate -------------------------------------------------------------------------------- ! ! ! Reference Dataset FEX_MTMSWEEP Text File: ! Mirror Transport Mechanism scan times ! ! Purpose: To be used for making reference file, for FPP to use, containing ! data for the FULL sweep flyback time. Times will be used in the ! computation of the midpoint and end of collect time for the ! interferograms. Times in tenths of microsecond for quadword use. ! This file contains values determined from NFS_ANC data. ! ! Author: Shirley M. Read, STX, January 1989. ! ! Notes: Mike Roberto, NASA, January 1989. ! Information on MTM sweeps and flyback provided for STX. ! Assumptions: 1. Total Time = Turn Around + Sweep + Flyback ! 2. Total Time > Valid Time during Sweep and Flyback ! 3. The Total Times given in the comments of the data ! statements / 2 are the Half Sweep Flyback Times needed ! needed for the midpoint of collect computation. ! 4. The Total Times are the current measured values ! for each MTM scan mode. They are not expected to change. ! !-------------------------Time when data was determined in gmt----------------- 91133000000000 !-------------------------Total Times------------------------------------------ 34600000 ! Total Time: short-slow, 3.46 sec. 112300000 ! Total Time: long-slow, 11.23 sec. 24600000 ! Total Time: short-fast, 2.46 sec. 79400000 ! Total Time: long-fast, 7.94 sec. !-------------------------Now just the flyback times:--------------------------- 4200000 ! FlyBack Time: short-slow, 0.42 sec. 13500000 ! FlyBack Time: long-slow, 1.35 sec. 4200000 ! FlyBack Time: short-fast, 0.42 sec. 13500000 ! FlyBack Time: long-fast, 1.35 sec. -------------------------------------------------------------------------------- ! ! Reference Dataset FEX_CTH Text File: ! Coaddition Consistency Check Thresholds ! ! Author: H. Wang, STX, 12/15/91 ! from information supplied by A. Trenholme, GSC, and J. Gales, ARC 0.02 0.02 0.02 0.02 ! Bolometer voltage fractional tolerances 0.005 0.005 0.005 0.005 0.05 0.05 0.005 0.005 0.005 0.005 ! GRT fractional tolerances 6.83421079E-01 9.50153229E-02 9.50153229E-02 ! XCAL S5 vs. S6 |B-A| <= X+Y*A+Z*B; X units degrees K 4.66147089E+00 2.09719441E-01 2.09719441E-01 ! XCAL tip vs. horn 5.76738409E-01 2.41855781E-01 2.41855781E-01 ! ICAL 5.31837506E-01 3.09347058E-02 3.09347058E-02 ! skyhorn 9.50488986E-02 8.48032507E-02 8.48032507E-02 ! refhorn 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 ! Absolute tolerances for bracketing major frame temp diff - A side; units tenth of a milliK 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 ! Absolute tolerances for bracketing major frame temp diff - B side; units tenth of a milliK 10.0 10.0 10.0 10.0 ! Galactic latitude cutoff for choosing neighbors 0.75 0.75 0.75 0.75 ! Upper fractional bounds for secondary template 0.25 0.25 0.25 0.25 ! Lower fractional bounds for secondary template 21 21 21 21 ! Number of points around and including IFG peak for secondary template fitting 0.0 3.910437E-03 0.0 3.200282E-03 ! Prim temp amplitude cutoff; RH values by scan mode 0.0 9.437958E-03 0.0 3.647456E-03 ! Prim temp amplitude cutoff; RL values by scan mode 3.004505E-02 0.0 0.0 8.729302E-02 ! Prim temp amplitude cutoff; LH values by scan mode 0.172503 4.713346E-02 0.0 0.0 ! Prim temp amplitude cutoff; LL values by scan mode 0.0 0.0 0.0 0.0 ! Prim temp signal/noise cutoff; RH values by scan mode 45.6246 0.0 0.0 2.38662 ! Prim temp signal/noise cutoff; RL values by scan mode 0.351102 8.55462 0.0 0.813985 ! Prim temp signal/noise cutoff; LH values by scan mode 0.0 6.69978 0.0 0.0 ! Prim temp signal/noise cutoff; LL values by scan mode 0.0 3.229239E-03 0.0 1.402862E-04 ! Sec temp amplitude cutoff; RH values by scan mode 3.120842E-03 6.070071E-03 0.0 6.562931E-04 ! Sec temp amplitude cutoff; RL values by scan mode 6.819824E-05 2.930424E-03 0.0 0.0 ! Sec temp amplitude cutoff; LH values by scan mode 0.0 0.0 0.0 0.0 ! Sec temp amplitude cutoff; LL values by scan mode 0.422241 0.788206 0.0 0.0 ! Sec temp signal/noise cutoff; RH values by scan mode 0.0 6.84626 0.0 0.0 ! Sec temp signal/noise cutoff; RL values by scan mode 4.508498E-02 1.77851 0.0 0.0 ! Sec temp signal/noise cutoff; LH values by scan mode 1.86342 1.16900 0.0 4.90552 ! Sec temp signal/noise cutoff; LL values by scan mode 0.5 0.5 0.5 0.5 ! Minimum IFG noise 1.5 1.5 1.5 1.5 ! Maximum IFG noise 2 2 2 2 ! Value below which to disregard IFG: high frequency, four scan modes 2 2 2 2 ! Value below which to disregard IFG: low frequency, four scan modes 6.0 6.0 6.0 6.0 ! Maximum point deviation 6 6 6 6 ! Maximum number of bad points -------------------------------------------------------------------------------- ! ! Reference Dataset FEX_MINCOADD Text File: ! Minimum number of ifgs ! ! Contains minimum number of IFGs needed to form templates ! in each channel (RH, RL, LH, LL). Used by FIL ! ! Author: S. Brodd, Hughes STX, 12/3/91 ! 3 3 3 3 ! Minimum number of IFGs -------------------------------------------------------------------------------- ! ! Reference Dataset FEX_GRTCOAWT Text File: ! GRT weights for coadded IFGs ! ! Sets relative weights of GRT's for instrument components to values ! determined by calibration program that minimize the chi-square of the ! calibration model solutions. The implication of these relative weights is ! that the calibration of the GRT's has drifted since launch. ! ! Nilo Gonzales/STX, August 21, 1991. ! 0.0 !XCAL GRT - A side *** A SIDE *** 0.5 !Skyhorn GRT - A side 0.5 !Reference Horn GRT - A side 0.1 !ICAL GRT - A side 0.5 !Dihederal GRT - A side 0.5 !Bolometer RH - A side 0.5 !Bolometer RL - A side 0.5 !Bolometer LH - A side 0.5 !Bolometer LL - A side 0.0 !Mirror Mount GRT - A side 0.0 !Cal Res RH - A side 0.0 !Cal Res RL - A side 0.0 !Cal Res LH - A side 0.0 !Cal Res LL - A side 0.5 !XCAL S5 GRT - A side 0.5 !Collimator - A side 0.0 !XCAL GRT - B side *** B SIDE *** 0.0 !Skyhorn GRT - B side 0.5 !Reference Horn GRT - B side 0.9 !ICAL GRT - B side 0.5 !Dihederal GRT - B side 0.5 !Bolometer RH - B side 0.5 !Bolometer RL - B side 0.5 !Bolometer LH - B side 0.5 !Bolometer LL - B side 0.0 !Mirror Mount GRT - B side 0.0 !Cal Res RH - B side 0.0 !Cal Res RL - B side 0.0 !Cal Res LH - B side 0.0 !Cal Res LL - B side 0.5 !XCAL S6 GRT - B side 0.0 !Collimator - B side -------------------------------------------------------------------------------- ! ! Reference Dataset FEX_GRTRAWWT Text File: ! GRT weights for raw IFGs ! ! Set weights to one as RAW weights only do combinations of the XCAL and ! 'structure', and don't combine sides. The collimator B and XCAL B weights ! are set to zero (no GRTs), and the Cal resistor weights are always zero. ! The XCAL A and S5 are set to 0.5 for the XCAL combination, and the A side ! mirror and collimator are equally weighted for the A side structure ! measurement. ! ! Nilo Gonzales/STX, August 21, 1991. ! 0.5 !XCAL GRT - A side *** A SIDE *** 1.0 !Skyhorn GRT - A side 1.0 !Reference Horn GRT - A side 1.0 !ICAL GRT - A side 1.0 !Dihederal GRT - A side 1.0 !Bolometer RH - A side 1.0 !Bolometer RL - A side 1.0 !Bolometer LH - A side 1.0 !Bolometer LL - A side 0.5 !Mirror Mount GRT - A side 0.0 !Cal Res RH - A side 0.0 !Cal Res RL - A side 0.0 !Cal Res LH - A side 0.0 !Cal Res LL - A side 0.5 !XCAL S5 GRT - A side 0.5 !Collimator - A side 0.0 !XCAL GRT - B side *** B SIDE *** 1.0 !Skyhorn GRT - B side 1.0 !Reference Horn GRT - B side 1.0 !ICAL GRT - B side 1.0 !Dihederal GRT - B side 1.0 !Bolometer RH - B side 1.0 !Bolometer RL - B side 1.0 !Bolometer LH - B side 1.0 !Bolometer LL - B side 1.0 !Mirror Mount GRT - B side 0.0 !Cal Res RH - B side 0.0 !Cal Res RL - B side 0.0 !Cal Res LH - B side 0.0 !Cal Res LL - B side 1.0 !XCAL S6 GRT - B side 0.0 !Collimator - B side -------------------------------------------------------------------------------- ! ! Reference Dataset FEX_GRTTRANS Text File: ! GRT low/high current transition temperatures ! ! Transition midpoint and half-width are defined so that the top of the ! transition region equals 3300 ohm, and the bottom is at 3700 ohm. ! ! Nilo Gonzales/STX, August 21, 1991. ! 2.431, .051 !XCAL GRT - A side *** A SIDE *** 2.597, .054 !Skyhorn GRT - A side 2.428, .048 !Reference Horn GRT - A side 2.485, .048 !ICAL GRT - A side 2.487, .049 !Dihederal GRT - A side 2.24, 0.10 !Bolometer RH - A side 2.50, 0.11 !Bolometer RL - A side 2.61, 0.12 !Bolometer LH - A side 2.34, 0.10 !Bolometer LL - A side 2.482, .054 !Mirror Mount GRT - A side 0.00,-1.00 !Cal Res RH - A side 0.00,-1.00 !Cal Res RL - A side 0.00,-1.00 !Cal Res LH - A side 0.00,-1.00 !Cal Res LL - A side 2.482, .047 !XCAL S5 GRT - A side 2.521, .049 !Collimator - A side 2.688, .057 !XCAL GRT - B side *** B SIDE *** 2.399, .050 !Skyhorn GRT - B side 2.636, .055 !Reference Horn GRT - B side 2.495, .050 !ICAL GRT - B side 2.761, .057 !Dihederal GRT - B side 2.37, 0.10 !Bolometer RH - B side 2.37, 0.11 !Bolometer RL - B side 2.37, 0.10 !Bolometer LH - B side 2.46, 0.10 !Bolometer LL - B side 2.588, .052 !Mirror Mount GRT - B side 0.00,-1.00 !Cal Res RH - B side 0.00,-1.00 !Cal Res RL - B side 0.00,-1.00 !Cal Res LH - B side 0.00,-1.00 !Cal Res LL - B side 2.589, .051 !XCAL S6 GRT - B side 0.00,-1.00 !Collimator - B side