Differential Loran-C using three secondary stations.
Abstract
Loran-C time difference (TD) readings were taken consecutively at several survey stations near Monterey, CA, over a period of three days. One station, Range-7, was designated the 'known' point of a differential Loran-C system. Readings from the known point were used to correct readings from a second survey station, Luces Point. A method of improving the precision of Loran-C TD readings based on the redundancy and relative accuracy of three LOP's was developed and applied to the data. Since only one receiver was available, a linear regression of TD vs time was calculated and used in the differential correction. Based on 496 sets of data taken at 5-second intervals at Range-7 in two groups, before and after about 250 readings at Luces Point, the absolute accuracy of Luces Point data was improved from about 385 m to about 48 m compared to the known position of the point. Precision was improved from about 14.9 m to about 12.6 m circular error (CEP) using the three-station correction. Further improvement would probably have resulted if two receivers were available for real time corrections. Keywords: LORAN; Differential corrections; Corrections using three secondary stations; Circular error probable; Error ellipse; Time difference; Geographic position; LOP(Line Of Position); Absolute accuracy. Theses
Collections
Related items
Showing items related by title, author, creator and subject.
-
Computations Pursuant to the Design of a Turbine Test Rig
McReynolds, Paul (Monterey, California. Naval Postgraduate School, 1963-09-20);The turbine test rig requires two separate units for recording torque and thrust. A set-up using flexures and strain gages is best from the standpoint of accuracy, ease of operation, first cost and neatness of design. At ... -
Statistical Methods for the Joint Oil Analysis Program
Jayachandran, Toke; Larson, H.J. (Monterey, California. Naval Postgraduate School, 1982-01); NPS55-82-002Developed statistical procedures for(a) daily standardization of oil analysis spectrometers-b) converting readings from an atomic absorption spectrometer into an equivalent set of readings on an atomic emission spectrometer ... -
C-DIFFERENTIALS AND GENERALIZED CRYPTOGRAPHIC PROPERTIES OF VECTORIAL BOOLEAN AND P-ARY FUNCTIONS
Geary, Aaron C. (Monterey, CA; Naval Postgraduate School, 2022-06);This dissertation investigates a newly defined cryptographic differential, called a c-differential, and its relevance to the nonlinear substitution boxes of modern symmetric block ciphers. We generalize the notions of ...