Phase and Delay Corrections

The phase and delay correction components provide builders for various types of phase and delay correction operators used in VLBI fringe fitting to compensate for instrumental and propagation effects.

MHO_ManualChannelDelayCorrectionBuilder

Class	MHO_ManualChannelDelayCorrectionBuilder
Primary Functionality	Builds a manual per-channel pc_delay operator
Key Features	Inherits from MHO_OperatorBuilder ParsePolFromName() method for polarization parsing Uses the inherited GetMatchingStationIdentifiers() mechanism for station identification Handles per-channel delay corrections

The MHO_ManualChannelDelayCorrectionBuilder class builds a manual per-channel delay correction operator for applying instrumental delay corrections on a per-channel basis. This is necessary for compensating for different cable lengths and electronic delays in different frequency channels.

The builder includes polarization parsing capabilities and station identification methods to properly apply corrections to the appropriate data selection.

MHO_ManualChannelPhaseCorrectionBuilder

Class	MHO_ManualChannelPhaseCorrectionBuilder
Primary Functionality	Builds a manual per-channel pc_phase operator
Key Features	Constructs MHO_ManualChannelPhaseCorrection operator Inherits from MHO_OperatorBuilder ParsePolFromName() method and inherited GetMatchingStationIdentifiers() mechanism Handles per-channel phase corrections

The MHO_ManualChannelPhaseCorrectionBuilder class builds a manual per-channel phase correction operator for applying instrumental phase corrections on a per-channel basis. This compensates for phase offsets introduced by different electronic paths in the signal processing chain. The builder provides polarization parsing and station identification capabilities to ensure corrections are applied to the correct data selection.

MHO_ManualPolDelayCorrectionBuilder

Class	MHO_ManualPolDelayCorrectionBuilder
Primary Functionality	Builds a manual per-polarization pc_delay operator
Key Features	Constructs per-polarization manual delay correction operator ParsePolFromName() method returns polarization (‘X’, ‘Y’, ‘R’, ‘L’) Uses the inherited GetMatchingStationIdentifiers() mechanism for station identification Handles per-polarization delay corrections

The MHO_ManualPolDelayCorrectionBuilder class builds a manual per-polarization delay correction operator for applying delay corrections based on polarization. This is important for compensating for polarization-dependent delays in the signal path prior to polarization summation.

The builder can handle linear polarizations (‘X’, ‘Y’) and circular polarizations (‘R’, ‘L’) and provides station identification capabilities for data selection.

MHO_ManualPolPhaseCorrectionBuilder

Class	MHO_ManualPolPhaseCorrectionBuilder
Primary Functionality	Builds a manual per-polarization pc_phase operator
Key Features	Constructs MHO_ManualPolPhaseCorrection operator ParsePolFromName() method and inherited GetMatchingStationIdentifiers() mechanism Handles per-polarization phase corrections Supports linear and circular polarizations

The MHO_ManualPolPhaseCorrectionBuilder class builds a manual per-polarization phase correction operator for applying phase corrections based on polarization. This compensates for polarization-dependent phase offsets in the signal processing chain, which are required prior to polarization summation.

The builder provides polarization parsing and station identification methods to ensure corrections are applied to the appropriate data selection.

MHO_StationDelayCorrectionBuilder

Class	MHO_StationDelayCorrectionBuilder
Primary Functionality	Builds a station delay correction operator
Key Features	Constructs and initializes MHO_StationDelayCorrection operator Uses the inherited GetMatchingStationIdentifiers() mechanism for station identification Handles station-level delay corrections

The MHO_StationDelayCorrectionBuilder class builds a station delay correction operator for applying delay corrections at the station level. This can be used to compensate for station-specific delays such as cable delays and local oscillator delays. The operator is applied uniformly to the whole station, without regard to polarization.

MHO_MultitonePhaseCorrectionBuilder

Class	MHO_MultitonePhaseCorrectionBuilder
Primary Functionality	Builds a multitone phase-cal correction operator
Key Features	Handles multitone phase calibration corrections ExtractStationCode() method returns the 2-character station code for station identification ExtractPCPeriod() method for PC period extraction AttachSamplerDelays() and AttachPCToneMask() methods GetSamplerDelayKey() method for sampler delay keys

The MHO_MultitonePhaseCorrectionBuilder class builds a multitone phase calibration correction operator that handles phase calibration signals generated from a pulse-cal system. This is necessary for correcting phase variations caused by instrumental effects in the signal processing chain (required for VGOS).

The builder provides specialized methods for extracting station identifiers, pcal periods, and managing sampler delays and tone masks needed for phase calibration corrections.

MHO_AdhocFlaggingBuilder

Class	MHO_AdhocFlaggingBuilder
Primary Functionality	Builds an ad-hoc flagging operator from control file parameters
Key Features	Triggered by an adhoc_flag_file <path> control statement Supports per-station flag files via station-conditional control blocks Maintains a single shared operator, updating ref/rem file paths as statements are processed

The MHO_AdhocFlaggingBuilder class builds an ad-hoc flagging operator that applies a user-supplied flag file to a station’s data. It is triggered by an adhoc_flag_file <path> compound statement in the control file, which may appear inside a station-conditional block (if station X …) to set the flag file for a specific station, or outside any condition to apply the same file to both stations. Because a baseline has two stations, the builder maintains a single adhoc_flagging operator in the toolbox and updates its reference/remote file paths as each control statement is processed.

MHO_AdhocPhaseCorrectionBuilder

Class	MHO_AdhocPhaseCorrectionBuilder
Primary Functionality	Builds an ad-hoc phase correction operator from control file parameters
Key Features	Triggered by an adhoc_phase <algorithm_type> control statement Supports sinewave, polynomial, and file-based correction modes Supports per-station override files via adhoc_file/adhoc_file_chans

The MHO_AdhocPhaseCorrectionBuilder class builds an ad-hoc phase correction operator that applies a user-specified phase correction model to a station’s data. It is triggered by an adhoc_phase <algorithm_type> compound statement in the control file, where algorithm_type selects the correction mode: sinewave, polynomial, or file. Auxiliary parameters (reference time, period, amplitude, or polynomial coefficients) are drawn from the parameter store on a per-station basis, and per-station file-based overrides can be supplied via adhoc_file/ adhoc_file_chans.