Table 2.

Summary of Parametrization Used in CSR Release‐06 GRACE‐FO Gravity Estimation Process

Parameter type	Description	Solve span and Remarks
Orbit arc length (common)	Satellite initial conditions	Estimated once per arc for each satellite.
Dynamical parameters (common)	Accelerometer bias	Includes a constant bias and a bias rate for each satellite.
		Terms are estimated once per arc in the accelerometer x and z directions.
		Terms are estimated every 3 hr in the accelerometer y direction (sub‐arc).
Observation parameters (local)	GPS double difference ambiguity	Estimated per combination and per pass.
	GPS troposphere zenith delay correction	One parameter per station estimated every 2.5 hr (sub‐arc).
	SST range rate corrections (KBR or LRI)	Includes a constant bias, a bias rate, and a once‐per‐revolution periodic bias term.
		All terms are estimated once per revolution (sub‐arc).
	LRI‐specific range rate corrections	Estimated once per arc.
		LRI scale and LRI time bias corrections.
		Does not apply to KBR observations (except for one experiment mentioned in Section 4.2).
Accelerometer scales (global)	Full accelerometer scale matrix	Estimated once per batch.
		9 individual components are estimated for each satellite.
Gravity field parameters (global)	Spherical Harmonic Coefficients	Estimated once per batch.
		Solutions used in this study are estimated up to degrees 60, 120 and 180