Configuration

CalibrationConfig

Field	Type	Default	Description
obs_mode	ObsMode	Auto	Observation mode (auto-detected if Auto)
pwv_source	PwvSource	FitGridRefine	PWV retrieval strategy
pwv_initial_guess	f64	1.0	Initial PWV guess for fitting (mm)
pwv_grid_min	f64	0.01	Minimum PWV in grid search (mm)
pwv_grid_max	f64	10.0	Maximum PWV in grid search (mm)
pwv_grid_steps	usize	100	Number of grid search points
pwv_per_pixel	bool	false	Fit PWV independently per pixel
clip_tsys	f64	200.0	Bad channel T_rec threshold multiplier (K)
clip_counts	f64	0.01	Minimum hot-cold count ratio
eta_fss	f64	1.0	Forward scattering efficiency
eta_mb	f64	1.0	Main beam efficiency
gain_el_correction	f64	1.0	Elevation-dependent gain correction
n_threads	Option	auto	Rayon thread pool size
physics	Physics	Exact	Physics constants precision

ObsMode

Variant	CLI value	Description
Auto	auto	Auto-detect from data
TotalPower	totalpower, tp	Position-switched ON/OFF
OtfTotalPower	otf, otf_totalpower	On-the-fly scanning
FrequencySwitch	—	Future: frequency-switched reference
BeamSwitch	—	Future: beam-switched reference

PwvSource

Variant	Description
FitGridRefine	Grid search (100 points) + Newton refinement (5 iterations)
FitLM	Levenberg-Marquardt least-squares (fallback)
External(f64)	Fixed PWV value in mm (no fitting)

PhysicsConstants

Variant	\(h/k_B\)	Notes
Exact	SI 2019, f64	Production default
KalibrateCompat	0.047995 K/GHz, f32 truncation	Legacy parity mode