This order identifies specific criteria, not presently found in existing standards, which shall be satisfied before Instrument Flight Rules (IFR) operations can be authorized using differential global positioning systems ( DGPS) Special Instrument App. IFR approval of differential global positioning system ( DGPS) special category I instrument approaches using private ground facilitiesĭOT National Transportation Integrated Search These recommendations contribute to the safety of DP operations of mobile offshore drilling units. to prevent erroneous position data from DGPS, are proposed. Recommendations to strengthen these barrier elements, i.e. Deficiencies of each barrier element are revealed based on the incidents and operational experiences in the North Sea. Barrier elements to prevent this failure are identified. Barrier method is used to analyze this critical DGPS failure. It is the simultaneous erroneous position data from two DGPS's. Generic failure modes of DGPS are discussed, and a critical DGPS failure which has the potential to cause drive-off for mobile drilling units is identified. Figure C-12: Latitude Error (TANS – 3Įffect of DGPS failures on dynamic positioning of mobile drilling units in the North Sea.Ĭhen, Haibo Moan, Torgeir Verhoeven, Harryīasic features of differential global positioning system ( DGPS), and its operational configuration on dynamically positioned (DP) mobile offshore drilling units in the North Sea are described.
The ASHTECH DGPS altitude data output was both.12 where a short leg of a flight trial is represented (the full horizontal track is shown in Figure C-13). For this purpose a number of over-sea flight legs were included in the trials. Pseudorange measurement, Ïi p denotes the geometric distance between the stations and satellite, dti denotes the receiver’s clock offsets, di p, denotes the.the DGPS data quality. Differential Global Positioning System ( DGPS) for Flight Testing (Global Positioning System Differentiel ( DGPS) pour les Essais en vol)