Add to ORKGSignal properties and permanent positioning of pseudo-satellity (pseudolites) as angmentation of satellite navigation systems offer advantages for the RNP parameters accuracy (inner and outer performance boundary), integrity, disposability and continuity of the overall navigation system. The present concept study analyzes operational, technical and economic aspects of pseudolites as integral components of future microcraft navigation systems with special regard to CAT II/III landings and to harmonization with existing pseudolite programmes (STe1/USA; multimodal approach for GNSS1 in European transport/EC). RNP specification of CAT III landings for the civil global navigation satellite system GNSS1 demonstrates that pseudolite angmentation w...