Abstract: The existing local airport monitor (LAM) with single receiver is not robust, and its integrity is not good enough. Based on multi-receivers local airport monitor (MLAM) concept, its integrity was discussed on both ground monitor station and airborne user. For ground monitor station, the multi-receivers pseudorange corrections verifying method was studied. Through using least monitor protection level principle to choose the optimal visible satellites combination, the computation complex is reduced. As to the airborne user, under the premise of system integrity, continuity and availability, the missed detection coefficient was computed to estimate airborne user protection level and thus improve the system performance. The experimental results demonstrate that, compared to the LAM, the accuracy and integrity of the MLAM are all improved.

Key words: satellite navigation, local area augmentation system （LAAS）, local airport monitor （LAM）