Accession Number : AD0714385

Title :   Report on the Final Phase of the R.A.E./F.A.A. VLF Navigation Study.

Descriptive Note : Technical rept.,

Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)

Personal Author(s) : Stringer, F. S. ; Couzens, R. ; Lawson, G. J. ; Rowe, L. E.

Report Date : NOV 1969

Pagination or Media Count : 111

Abstract : The paper describes the experiments and analysis of data gathered during November 1968 as part of a series to assess the feasibility of resolving ambiguities within the Omega VLF NAVIGATION SYSTEM. The flight trials described compared the incremental changes in Omega lines of position at 10.2 kHz and 13.6 kHz with changes over the same increments of time measured by both Doppler radar and an inertial navigator. Datum measurements with Loran C and Dectra demonstrated the classical recommendation of a hybrid comprising a dead reckoning sensor and a fixing sensor such as Omega, that their stabilities are complementary and their integration would provide good flight control with long term reliability of position fixing. The comparison between Omega and the dead reckoning aids was made with the aid of an Argus 400 computer. The scatter between them over incremental times of five and ten minutes was small enough to provide a ready indication of Omega lane slip or loss or failure of the DR system, at least when signal levels were reasonable. There is ample evidence that the next phase of integrating the Omega and inertia or Doppler should be initiated experimentally. The trial also demonstrated that computer storage space and capacity can be saved by the pre-calculation of some geodesic information upon the assumption of an approximate flight plan. (Author)

Descriptors :   *HYPERBOLIC NAVIGATION, VERY LOW FREQUENCY, ACCURACY, INTEGRATED SYSTEMS, GREAT BRITAIN, OMEGA NAVIGATION.

Subject Categories : Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE