pppar

type InputData struct {
	Type    string      // Data type identifier
	Payload interface{} // Data payload
}

type PPP struct {
	Config            PPPConfig
	DataChan          chan InputData
	ResultsChan       chan Results
	Epoch             observation.Epoch
	Ephemeris         *ephemeris.EphemerisStore
	PreciseProducts   products.PreciseProductProvider
	SatelliteStateMap *state.PPPSatelliteStateMap
	FilterState       *filter.EKFState
	Result            PPPResult
	// contains filtered or unexported fields
}

type PPPConfig struct {
	config.Config // Embed base configuration

	// Precise product settings
	SP3FilePath   string // Path to SP3 precise orbit file
	CLKFilePath   string // Path to clock (CLK) file
	BiasSINEXPath string // Path to Bias-SINEX file (CODE or IGS)
	VMFGridPath   string // Path to VMF troposphere grid files
	AntexFilePath string // Path to ANTEX antenna calibration file

	// Processing mode
	ProcessingMode string // "static" or "kinematic"

	// Ambiguity resolution settings
	AREnabled          bool    // Enable ambiguity resolution
	ARMinRatio         float64 // Ratio test threshold (default: 3.0)
	ARMinSatellites    int     // Minimum satellites required for AR (default: 5)
	ARValidationMethod string  // "ratio", "w-test", or "combined"

	// Troposphere estimation
	EstimateTroposphere bool   // Enable troposphere estimation
	TroposphereModel    string // "VMF1", "VMF3", or "Saastamoinen"
	EstimateGradients   bool   // Estimate troposphere gradients (North/East)

	// Process noise parameters (for Kalman filter)
	ProcessNoisePosition    float64 // m²/s - for kinematic mode
	ProcessNoiseClock       float64 // m²/s - receiver clock random walk
	ProcessNoiseTroposphere float64 // m²/s - troposphere ZWD random walk
	ProcessNoiseAmbiguity   float64 // cycles²/s - float ambiguity process noise (typically 0)

	// Measurement weighting
	CodeSigma  float64 // Code measurement std dev (meters), default: 1.0
	PhaseSigma float64 // Phase measurement std dev (meters), default: 0.01
}

type PPPResult struct {
	Time                 time.Time
	Position             coordinates.Vector3D
	PositionCovariance   [3][3]float64           // Position covariance (ECEF)
	ReceiverClocks       map[gnss.System]float64 // Per-system receiver clocks (meters)
	ClockCovariances     map[gnss.System]float64 // Clock uncertainties (meters)
	TroposphereZWD       float64                 // Zenith wet delay (meters)
	TroposphereVariance  float64                 // ZWD uncertainty (meters²)
	TroposphereGradient  [2]float64              // North, East gradients (meters)
	NumberOfSatellites   int                     // Number of satellites used
	NumberOfObservations int                     // Total observations (code + phase)
	AmbiguityStatus      string                  // "float", "partial_fixed", "fixed"
	FixedAmbiguities     int                     // Number of fixed ambiguities
	FloatAmbiguities     int                     // Number of float ambiguities
	PDOP                 float64                 // Position dilution of precision
	Converged            bool                    // Solution convergence flag
}

type Results struct {
	Type    string      // Result type identifier
	Payload interface{} // Result payload
}