Error Modeling and Analysis for InSAR Spatial Baseline Determination of Satellite Formation Flying

Table 2

Error accuracies and modeling descriptions in simulations.

Error type	Error accuracy	Modeling description
GPS code measurement noise	0.5 m (1σ)	Gaussian white noise model with mean value of 0 m and standard deviation of 0.5 m
GPS carrier phase measurement noise	0.002 m (1σ)	AR(2) model with mean value of 0 m and standard deviation of 0.002 m
Ground calibration error of GPS receiver antenna phase center	—	ARP data, PCO data, and PCVs data (mean value data and RMS data) of SEN67-1575-14+CRG
Attitude measurement error	Fixed bias of 0.005° in the yaw, pitch, and roll components plus a 0.003° (1σ) random error	Gaussian white noise model with mean value of 0.005° and standard deviation of 0.003° in the yaw, pitch, and roll components
Fixing error of GPS receiver antenna	0.5 mm (3σ)	A fixed vector with direction randomly drawn in unit ball and magnitude of 0.5 mm in each satellite body coordinate system
Consistency error of SAR antenna phase center	0.25 mm (3σ)	A fixed vector with direction randomly drawn in unit ball and magnitude of 0.25 mm in body coordinate system of Satellite 1