Question 4 At a given moment in time, a GPS receiver determines the following: inv(H'*H) = [0.4000 -0.3068 0.1068 0.2035; -0.3068 1.2733 -0.7288 -0.7649; 0.1068 -0.7288 1.0288 0.6599; 0.2035 -0.7649 0.6599 0.6573] a) Determine PDOP b) Assuming the errors on all the satellite measurements are independent white Gaussian noise with a standard deviation of 2 meters, determine the standard deviation of the 3-D positioning error. Question 4 At a given moment in time, a GPS receiver determines the following: inv(H'*H) = [0.4000 -0.3068 0.1068 0.2035; -0.3068 1.2733 -0.7288 -0.7649; 0.1068 -0.7288 1.0288 0.6599; 0.2035 -0.7649 0.6599 0.6573] a) Determine PDOP b) Assuming the errors on all the satellite measurements are independent white Gaussian noise with a standard deviation of 2 meters, determine the standard deviation of the 3-D positioning error