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THE NERC MST RADAR FACILITY AT ABERYSTWYTH
PROPOSED CHANGES TO V3 RADIAL FILES
In preparation for the re-processing of the entire MST radar observation archive, a few small changes have been made to upgrade the current version 3.2 signal processing scheme to a version 3.3 scheme:
  • A correction has been made to the (time-continuity) reliability flagging scheme, which used to cause problems when the radar cycle format was changed (i.e. infrequently).

  • The assumed value for the speed of light, which is used to calculate the range and altitude of radar range gates, has been changed from 3.0e8 to 299,792,458.0 m/s. This will be relatively insignificant for the ST-mode observations, leading to a maximum difference in the calculated ranges and altitudes of 15 m. However, it leads to differences of up to 65 m, i.e. almost half a range gate, in the M-mode.

  • A change will be made to the bit-encoding of the reliability details variables in order to remove a redundant piece of information. However, there will still be an additional binary flag which simply indicates whether or not a parameter value is judged to be reliable.

  • The Variable and Global Variable names in the netCDF files will be changed slightly in order to reduce ambiguities and to better reflect the relationships between parameters. This logic is most apparent when the new names are viewed as a group. Tables are also provided which interlace the current and new names. The new names may be changed slightly compared to those proposed here. Final details will be included in a separate page once the reprocessing begins.
Tables are available for the following:

    Current (version 3.2) Variable names
  1. time
  2. range
  3. latitude
  4. longitude
  5. signal_component_number

  6. beam_pointing_direction_number
  7. beam_pointing_azimuth_angle
  8. beam_pointing_zenith_angle
  9. length_of_transmitter_pulse
  10. sub_length_of_transmitter_pulse
  11. inter_pulse_period
  12. number_of_coherent_integrations
  13. number_of_complex_samples_in_discrete_fourier_transform
  14. data_weighting_window_index
  15. number_of_incoherent_integrations
  16. spectral_velocity_bin_spacing
  17. dwell_number
  18. time_index_of_first_dwell_in_cycle
  19. alternative_profile_details

  20. noise_power

  21. signal_component_is_reliable
  22. signal_component_reliability_details
  23. signal_power
  24. radial_velocity
  25. spectral_width
  26. first_velocity_bin_number
  27. final_velocity_bin_number
  28. peak_smooth_psd_to_noise

    Proposed new (version 3.3) Variable names
  1. time
  2. range
  3. latitude
  4. longitude
  5. signal_component_index

  6. dwell_beam_pointing_direction_number
  7. dwell_beam_pointing_direction_azimuth_angle
  8. dwell_beam_pointing_direction_zenith_angle
  9. dwell_length_of_transmitter_pulse
  10. dwell_sub_length_of_transmitter_pulse
  11. dwell_inter_pulse_period
  12. dwell_number_of_coherent_integrations
  13. dwell_number_of_complex_samples_in_discrete_fourier_transform
  14. dwell_data_weighting_window_index
  15. dwell_number_of_incoherent_integrations
  16. dwell_velocity_bin_spacing
  17. dwell_index_within_cycle
  18. dwell_time_of_first_dwell_within_cycle
  19. dwell_alternative_profile_details

  20. spectrum_noise_power

  21. signal_component_reliability_flag
  22. signal_component_reliability_details
  23. signal_component_power
  24. signal_component_radial_velocity
  25. signal_component_spectral_width
  26. signal_component_first_velocity_bin_number
  27. signal_component_final_velocity_bin_number
  28. signal_component_peak_smoothed_psd_to_spectrum_noise_psd

    Interlaced current (version 3.2) and proposed new (version 3.3) Variable names
  1. time
    time
  2. range
    range
  3. latitude
    latitude
  4. longitude
    longitude
  5. signal_component_number
    signal_component_index

  6. beam_pointing_direction_number
    dwell_beam_pointing_direction_number
  7. beam_pointing_azimuth_angle
    dwell_beam_pointing_direction_azimuth_angle
  8. beam_pointing_zenith_angle
    dwell_beam_pointing_direction_zenith_angle
  9. length_of_transmitter_pulse
    dwell_length_of_transmitter_pulse
  10. sub_length_of_transmitter_pulse
    dwell_sub_length_of_transmitter_pulse
  11. inter_pulse_period
    dwell_inter_pulse_period
  12. number_of_coherent_integrations
    dwell_number_of_coherent_integrations
  13. number_of_complex_samples_in_discrete_fourier_transform
    dwell_number_of_complex_samples_in_discrete_fourier_transform
  14. data_weighting_window_index
    dwell_data_weighting_window_index
  15. number_of_incoherent_integrations
    dwell_number_of_incoherent_integrations
  16. spectral_velocity_bin_spacing
    dwell_velocity_bin_spacing
  17. dwell_number
    dwell_index_within_cycle
  18. time_index_of_first_dwell_in_cycle
    dwell_time_of_first_dwell_within_cycle
  19. alternative_profile_details
    dwell_alternative_profile_details

  20. noise_power
    spectrum_noise_power

  21. signal_component_is_reliable
    signal_component_reliability_flag
  22. signal_component_reliability_details
    signal_component_reliability_details
  23. signal_power
    signal_component_power
  24. radial_velocity
    signal_component_radial_velocity
  25. spectral_width
    signal_component_spectral_width
  26. first_velocity_bin_number
    signal_component_first_velocity_bin_number
  27. final_velocity_bin_number
    signal_component_final_velocity_bin_number
  28. peak_smooth_psd_to_noise
    signal_component_peak_smoothed_psd_to_spectrum_noise_psd

    Current (version 3.2)Global Variable names
  1. Conventions
  2. title
  3. institution
  4. source
  5. history
  6. references
  7. comment

  8. data_year
  9. data_month
  10. data_day
  11. data_altitude_mode
  12. data_range_resolution_m
  13. data_range_resolution_number
  14. data_bottom_range_gate_number
  15. data_top_range_gate_number

  16. radar_location_name
  17. radar_british_national_grid_reference
  18. radar_latitude_degrees_north
  19. radar_longitude_degrees_east
  20. radar_altitude_above_mean_sea_level_m

  21. radar_frequency_MHz
  22. radar_wavelength_m
  23. radar_transmitters
  24. radar_peak_transmitted_power_kW
  25. radar_antenna_type
  26. radar_antenna_side_length_m
  27. radar_beam_one_way_half_power_half_width_degrees

  28. signal_processing_version_number
  29. signal_processing_sub_version_number

  30. sig_lims_nr_vel_bins_smoothing
  31. sig_lims_min_norm_psd
  32. sig_lims_max_norm_psd_at_local_min
  33. sig_lims_min_peak_smooth_psd_to_noise_dB_to_flag

  34. radial_cont_checks_have_been_applied
  35. radial_cont_min_sig_width_ratio
  36. radial_cont_max_sig_width_ratio
  37. radial_cont_min_sig_overlap_ratio
  38. radial_cont_link_std_dev_radial_vel_mps
  39. radial_cont_link_std_dev_range_m
  40. radial_cont_min_unambiguous_link_weight
  41. radial_cont_min_ratio_of_max_link_weight_for_search
  42. radial_cont_max_std_dev_sig_power_dB_for_intf
  43. radial_cont_min_fraction_of_range_gates_for_alternative_path
  44. radial_cont_apply_lower_path_correction
  45. radial_cont_max_altitude_amsl_m_for_lower_path_correction
  46. radial_cont_max_link_radial_vel_sep_mps
  47. radial_cont_chain_fill_max_radial_vel_sep_mps

  48. time_cont_uni_dirn_time_radius_mins
  49. time_cont_bi_dirn_time_radius_mins
  50. time_cont_max_vert_vel_comp_diff_mps
  51. time_cont_max_horiz_vel_comp_diff_mps
  52. time_cont_min_nr_buddies_fixed_coeff
  53. time_cont_min_nr_buddies_scale_coeff
  54. time_cont_min_nr_dwells_to_apply


    Proposed new (version 3.3) Global Variable names
  1. Conventions
  2. title
  3. institution
  4. source
  5. history
  6. references
  7. comment

  8. data_year
  9. data_month
  10. data_day
  11. data_altitude_mode
  12. data_range_resolution_m
  13. data_range_resolution_number
  14. data_bottom_range_gate_number
  15. data_top_range_gate_number

  16. instrument_location_name
  17. instrument_location_british_national_grid_reference
  18. instrument_location_latitude_degrees_north
  19. instrument_location_longitude_degrees_east
  20. instrument_location_altitude_above_mean_sea_level_m

  21. no corresponding Global Variable
  22. no corresponding Global Variable
  23. no corresponding Global Variable
  24. no corresponding Global Variable
  25. no corresponding Global Variable
  26. no corresponding Global Variable
  27. no corresponding Global Variable

  28. signal_processing_version_number
  29. signal_processing_sub_version_number

  30. signal_component_limits_number_of_velocity_bins_smoothing
  31. signal_component_limits_minimum_self_normalised_smoothed_psd
  32. signal_component_limits_maximum_self_normalised_smoothed_psd_for_local_minumum
  33. no corresponding Global Variable

  34. radial_continuity_chain_checks_have_been_applied
  35. radial_continuity_chain_minimum_signal_component_width_ratio
  36. radial_continuity_chain_maximum_signal_component_width_ratio
  37. radial_continuity_chain_minimum_signal_component_width_overlap_ratio
  38. radial_continuity_chain_link_radial_velocity_standard_deviation_mps
  39. radial_continuity_chain_link_range_standard_deviation_m
  40. radial_continuity_chain_link_minimum_unambiguous_weight
  41. radial_continuity_chain_link_minimum_weight_ratio_for_alternative_search
  42. radial_continuity_interference_maximum_signal_power_standard_deviation_dB
  43. radial_continuity_interference_minimum_pc_of_range_gates_for_alternative_profile
  44. radial_continuity_alternative_profile_lower_correction_applied
  45. radial_continuity_alternative_profile_lower_correction_maximum_altitude_m
  46. radial_continuity_chain_link_maximum_radial_velocity_difference_mps
  47. radial_continuity_inter_chain_maximum_radial_velocity_difference_mps

  48. time_continuity_maximum_uni_directional_time_difference_minutes
  49. time_continuity_maximum_bi_directional_time_difference_minutes
  50. time_continuity_maximum_vertical_beam_radial_velocity_difference_mps
  51. time_continuity_maximum_off_vertical_beam_horizontal_velocity_difference_mps
  52. time_continuity_minimum_number_of_buddies_fixed_coefficient
  53. time_continuity_minimum_number_of_buddies_scale_coefficient
  54. time_continuity_minimum_number_of_dwells_in_order_to_apply


    Interlaced current (version 3.2) and proposed new (version 3.3) Global variable names
  1. Conventions
    Conventions
  2. title
    title
  3. institution
    institution
  4. source
    source
  5. history
    history
  6. references
    references
  7. comment
    comment

  8. data_year
    data_year
  9. data_month
    data_month
  10. data_day
    data_day
  11. data_altitude_mode
    data_altitude_mode
  12. data_range_resolution_m
    data_range_resolution_m
  13. data_range_resolution_number
    data_range_resolution_number
  14. data_bottom_range_gate_number
    data_bottom_range_gate_number
  15. data_top_range_gate_number
    data_top_range_gate_number

  16. radar_location_name
    instrument_location_name
  17. radar_british_national_grid_reference
    instrument_british_national_grid_reference
  18. radar_latitude_degrees_north
    instrument_latitude_degrees_north
  19. radar_longitude_degrees_east
    instrument_longitude_degrees_east
  20. radar_altitude_above_mean_sea_level_m
    instrument_altitude_above_mean_sea_level_m

  21. radar_frequency_MHz
    no corresponding Global variable
  22. radar_wavelength_m
    no corresponding Global variable
  23. radar_transmitters
    no corresponding Global variable
  24. radar_peak_transmitted_power_kW
    no corresponding Global variable
  25. radar_antenna_type
    no corresponding Global variable
  26. radar_antenna_side_length_m
    no corresponding Global variable
  27. radar_beam_one_way_half_power_half_width_degrees
    no corresponding Global variable

  28. signal_processing_version_number
    signal_processing_version_number
  29. signal_processing_sub_version_number
    signal_processing_sub_version_number

  30. sig_lims_nr_vel_bins_smoothing
    signal_component_limits_number_of_velocity_bins_smoothing
  31. sig_lims_min_norm_psd
    signal_component_limits_minimum_self_normalised_smoothed_psd
  32. sig_lims_max_norm_psd_at_local_min
    signal_component_limits_maximum_self_normalised_smoothed_psd_for_local_minumum
  33. sig_lims_min_peak_smooth_psd_to_noise_dB_to_flag
    no corresponding Global Variable

  34. radial_cont_checks_have_been_applied
    radial_continuity_chain_checks_have_been_applied
  35. radial_cont_min_sig_width_ratio
    radial_continuity_chain_minimum_signal_component_width_ratio
  36. radial_cont_max_sig_width_ratio
    radial_continuity_chain_maximum_signal_component_width_ratio
  37. radial_cont_min_sig_overlap_ratio
    radial_continuity_chain_minimum_signal_component_width_overlap_ratio
  38. radial_cont_link_std_dev_radial_vel_mps
    radial_continuity_chain_link_radial_velocity_standard_deviation_mps
  39. radial_cont_link_std_dev_range_m
    radial_continuity_chain_link_range_standard_deviation_m
  40. radial_cont_min_unambiguous_link_weight
    radial_continuity_chain_link_minimum_unambiguous_weight
  41. radial_cont_min_ratio_of_max_link_weight_for_search
    radial_continuity_chain_link_minimum_weight_ratio_for_alternative_search
  42. radial_cont_max_std_dev_sig_power_dB_for_intf
    radial_continuity_interference_maximum_signal_power_standard_deviation_dB
  43. radial_cont_min_fraction_of_range_gates_for_alternative_path
    radial_continuity_interference_minimum_pc_of_range_gates_for_alternative_profile
  44. radial_cont_apply_lower_path_correction
    radial_continuity_alternative_profile_lower_correction_applied
  45. radial_cont_max_altitude_amsl_m_for_lower_path_correction
    radial_continuity_alternative_profile_lower_correction_maximum_altitude_m
  46. radial_cont_max_link_radial_vel_sep_mps
    radial_continuity_chain_link_maximum_radial_velocity_difference_mps
  47. radial_cont_chain_fill_max_radial_vel_sep_mps
    radial_continuity_inter_chain_maximum_radial_velocity_difference_mps

  48. time_cont_uni_dirn_time_radius_mins
    time_continuity_maximum_uni_directional_time_difference_minutes
  49. time_cont_bi_dirn_time_radius_mins
    time_continuity_maximum_bi_directional_time_difference_minutes
  50. time_cont_max_vert_vel_comp_diff_mps
    time_continuity_maximum_vertical_beam_radial_velocity_difference_mps
  51. time_cont_max_horiz_vel_comp_diff_mps
    time_continuity_maximum_off_vertical_beam_horizontal_velocity_difference_mps
  52. time_cont_min_nr_buddies_fixed_coeff
    time_continuity_minimum_number_of_buddies_fixed_coefficient
  53. time_cont_min_nr_buddies_scale_coeff
    time_continuity_minimum_number_of_buddies_scale_coefficient
  54. time_cont_min_nr_dwells_to_apply
    time_continuity_minimum_number_of_dwells_in_order_to_apply


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File format for v3.2 radial data files
Proposed parameter names for v3.3 Cartesian data files
Page maintained by David Hooper
Last updated 6th November 2009