Accession Number:

ADA230770

Title:

HF Propagation Analysis: Puerto Rico Airborne Ionospheric Observatory Flights in Support of the Over-the-Horizon Radar System

Descriptive Note:

Technical rept.

Corporate Author:

NORTHWEST RESEARCH ASSOCIATES INC BELLEVUE WA

Personal Author(s):

• Sales, Gary S.
• Moore, James G.
• Kitrosser, David F.

Report Date:

1988-08-01

Pagination or Media Count:

26.0

Abstract:

Flights in the coverage area of Segment 3 of the East Coast OTH-B radar to calibrate a radar target emulator were used to study propagation conditions over long paths 3000 km off the East Coast of the U.S. Analysis of MOF data, derived from oblique propagation ionograms, and MUF data derived for respective distances from the onboard ionosonde data indicate substantial discrepancies. This is, in view of the long path, not surprising. MOF changes were out of phase with path length changes. The analysis of Martyns Theorem shows, that for the long propagation path, the contribution of MUF variation from the time dependence of foF2 was 22 times greater than the range contribution, and of the opposite sign, under the conditions observed during the measurement.

Descriptors:

• *OVER THE HORIZON RADAR
• PROPAGATION
• HIGH FREQUENCY
• COASTAL REGIONS
• PATHS
• RADAR
• IONOGRAMS
• OVER THE HORIZON DETECTION
• RADAR TARGETS
• IONOSONDES
• ONBOARD
• EAST(DIRECTION)
• SIMULATORS
• LENGTH

Subject Categories:

• Active and Passive Radar Detection and Equipment
• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE