1. Bai J (2008) Robust navigation algorithms for aircraft precision approach, landing and surface movement using global navigation satellite systems, PhD thesis, Imperial College London
2. Bai J, Schuster W, Ochieng W (2008) Advanced navigation algorithms for airport surface movement—developments & performance. ENC GNSS, Toulouse
3. Boeing (2005) Determining the vertical alert requirements for a level of GBAS service that is appropriate to support Cat II/III operations, Boeing report vol IV
4. Feng S, Ochieng W, Moore T, Hill C, Hide C (2008) Carrier phase based integrity monitoring for high accuracy positioning, GPS Solut 13(1):13–22
5. Klobuchar JA (1975) A first-order, worldwide, ionospheric time-delay algorithm, air force surveys in geophysics, No. 324