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Table 3. Accelerometer calibration parameters: estimated by POD vs. advertised.

From: Thermospheric density and wind retrieval from Swarm observations

Satellite Date Bias (nm/s2) Scale factor
   Advertised Estimated Advertised Estimated
X axis      
GRACE-A 7 Nov. −1130 −1127 0.960 0.962
  8 Nov. −1130 −1122 0.960 0.958
GRACE-B 7 Nov. −553 −557 0.960 0.944
  8 Nov. −553 −561 0.960 0.951
CHAMP 7 Nov. −2961 −2964 0.834 0.850
  8 Nov. −2961 −2947 0.834 0.844
Y axis      
GRACE-A 7 Nov. 28227 27940 0.980 0.979
  8 Nov. 28225 27964 0.980 0.980
GRACE-B 7 Nov. 8689 9175 0.970 0.972
  8 Nov. 8690 9173 0.970 0.971
CHAMP 7 Nov. 376 265 0.800 0.803
  8 Nov. 376 242 0.800 0.801
Z axis1      
GRACE-A 7 Nov. −500 −372 0.940 0.940
  8 Nov. −500 −365 0.940 0.940
GRACE-B 7 Nov. −775 −630 0.920 0.920
  8 Nov. −775 −665 0.920 0.920
CHAMP2 N/A N/A N/A N/A N/A
  1. 1 Scale factor fixed to 1 for Z axis
  2. 2 Electrode failure for Z axis