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. Satellites A, B, C are at 1000Km from the origin. B C . The user is assumed to be close to the origin. X 1. Compute the H matrix. 2. When will the matrix H not be invertible ? 3. For - -7/2, compute the PA = 1100 Km position of the user solving the linearized equations of PB = 1100Km GPS. Pc = 1000Km. Satellites A, B, C are at 1000Km from the origin. B C . The user is assumed to be close to the origin. X 1. Compute the H matrix. 2. When will the matrix H not be invertible ? 3. For - -7/2, compute the PA = 1100 Km position of the user solving the linearized equations of PB = 1100Km GPS. Pc = 1000Km