Accession Number:

ADA076214

Title:

Loran-C System Dynamic Model: Temporal Propagation Variation Study.

Descriptive Note:

Final rept. 1 Oct 78-30 Apr 79,

Corporate Author:

ANALYTICAL SYSTEMS ENGINEERING CORP BURLINGTON MA

Personal Author(s):

• Campbell ,L. W.
• Doherty ,R. H.
• Johler,J. R.

Report Date:

1979-07-01

Pagination or Media Count:

62.0

Abstract:

The results of a theoretical study to determine the expected extent of temporal variations in the Loran-C System are presented. Graphs of secondary phase correction vs distance, parametric in vertical lapse factor, for six values of ground impedance and parametric in ground impedance, for three values of vertical lapse factor are included. Although the secondary phase correction is most sensitive to ground impedance, it is relatively time stable and the most important parameter of concern in temporal variations is the vertical lapse factor. The effect of the surface refractive index on the secondary phase correction is negligible except in so far as it is correlated with the vertical lapse factor. A flow diagram and description of a program suitable for use on a desk calculator to calculate the secondary phase correction is included. Author

Descriptors:

• *GROUND WAVES(ELECTROMAGNETIC)
• *LORAN
• THERMAL PROPERTIES
• REFRACTIVE INDEX
• PHASE STUDIES
• ELECTROMAGNETIC WAVE PROPAGATION
• ELECTRICAL IMPEDANCE
• LAPSE RATE
• ATMOSPHERIC PHYSICS

Subject Categories:

• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE