
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 SEN67157514+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 
