Error ellipses There is only 40% chance of being in 1-sigma error(compared to 68% of 1-sigma in one dimension Commonly see 95% confidence ellipse which is 2.45-sigma(only 2-sigma in 1-D) Commonly used for GPS position and velocity results 03/1802 12.540Lec1203/18/02 12.540 Lec 12 7 Error ellipses • There is only 40% chance of being in 1-sigma error (compared to 68% of 1-sigma in one dimension) • Commonly see 95% confidence ellipse which is 2.45-sigma (only 2-sigma in 1-D). • Commonly used for GPS position and velocity results