IDL Data Structure for Fitted ACF data

Summary

A description of the IDL data structure used to store Fitted ACF data.

Description

The FitACF algorithm is used to derive doppler velocities, spectral widths and powers from the raw ACF data. Within IDL a structure is used to store the fitted ACF data.

Constants

A number of constants are used to define array limits

MAX_RANGE=300

Raw ACF data structure RawData

fit={FitData, $
      revision: {rlstr, major: 0L, $  ; major revision
                        minor: 0L}, $ ; minor revision
      noise: {nfstr, sky: 0.0, $      ; sky noise
                    lag0: 0.0, $      ; lag-zero power of noise ACF
                     vel: 0.0}, $     ; velocity from fitting noise ACF
      pwr0: fltarr(MAX_RANGE), $      ; lag-zero power
      nlag: intarr(MAX_RANGE), $      ; number of points in the fit
      qflg: bytarr(MAX_RANGE), $      ; quality flag
      gflg: bytarr(MAX_RANGE), $      ; ground scatter flag
      p_l:  fltarr(MAX_RANGE), $      ; power from lambda fit 
      p_l_e: fltarr(MAX_RANGE), $     ; power error from lambda fit 
      p_s: fltarr(MAX_RANGE), $       ; power from sigma fit 
      p_s_e: fltarr(MAX_RANGE), $     ; power error from sigma fit  
      v: fltarr(MAX_RANGE), $         ; velocity
      v_e: fltarr(MAX_RANGE), $       ; velocity error
      w_l: fltarr(MAX_RANGE), $       ; spectral width from lambda fit
      w_l_e: fltarr(MAX_RANGE), $     ; spectral width error from lambda fit
      w_s: fltarr(MAX_RANGE), $       ; spectral width from sigma fit
      w_s_e: fltarr(MAX_RANGE), $     ; spectral width error from sigma fit 
      sd_l: fltarr(MAX_RANGE), $      ; standard deviation of lambda fit
      sd_s: fltarr(MAX_RANGE), $      ; standard deviation of sigma fit
      sd_phi: fltarr(MAX_RANGE), $    ; standard deviation of phase fit 
      x_qflg: bytarr(MAX_RANGE), $    ; XCF quality flag
      x_gflg: bytarr(MAX_RANGE), $    ; XCF ground scatter flag
      x_p_l: fltarr(MAX_RANGE), $     ; XCF power from lambda fit
      x_p_l_e: fltarr(MAX_RANGE), $   ; XCF power error from lambda fit 
      x_p_s: fltarr(MAX_RANGE), $     ; XCF power from sigma fit
      x_p_s_e: fltarr(MAX_RANGE), $   ; XCF power error from sigma fit 
      x_v: fltarr(MAX_RANGE), $       ; XCF velocity
      x_v_e: fltarr(MAX_RANGE), $     ; XCF velocity error
      x_w_l: fltarr(MAX_RANGE), $     ; XCF spectral width from lambda fit
      x_w_l_e: fltarr(MAX_RANGE), $   ; XCF spectral width error from lambda fit
      x_w_s: fltarr(MAX_RANGE), $     ; XCF spectral width from sigma fit
      x_w_s_e: fltarr(MAX_RANGE), $   ; XCF spectral width error from sigma fit
      phi0: fltarr(MAX_RANGE), $      ; phase determination
      phi0_e: fltarr(MAX_RANGE), $    ; phase determination error  
      elv: fltarr(MAX_RANGE), $       ; angle of arrival estimate recommended for scientific use
      elv_fitted(MAX_RANGE), $        ; Alternative elevation angle determined from fitted phase (FitACF v3 only)
      elv_error(MAX_RANGE), $         ; Least-square elevation angle error (FitACF v3 only)
      elv_low: fltarr(MAX_RANGE), $   ; lowest estimate of angle of arrival (FitACF v1-2 only)
      elv_high: fltarr(MAX_RANGE), $  ; highest estimate of angle of arrival (FitACF v1-2 only)
      x_sd_l: fltarr(MAX_RANGE), $    ; XCF standard deviation of lambda fit
      x_sd_s: fltarr(MAX_RANGE), $    ; XCF standard deviation of sigma fit
      x_sd_phi: fltarr(MAX_RANGE) $   ; XCF standard deviation of phase fit 
   }

References

• FitACF Structure in C
• This information is sourced from the RFC: 0022 previously in the RST RFC documentation that was written by R.J. Barnes.

History from RFC Documentation

• 2007/03/26 Change in array sizes.
• 2004/11/22 Initial Revision.