Accession Number:

ADP002727

Title:

A Review of Propagation and Scattering Factors in Remote-Sensing and Ship-Tracking by HF (High Frequency) Radar,

Descriptive Note:

Corporate Author:

BIRMINGHAM UNIV (ENGLAND) DEPT OF ELECTRONIC AND ELECTRICAL ENGINEERING

Personal Author(s):

• Shearman,E. D. R.

Report Date:

1983-08-01

Pagination or Media Count:

13.0

Abstract:

The propagation-loss, noise and scattering mechanisms involved in ground-wave radar for sea-state sensing and ship-tracking are first reviewed, taking as an example a coastal installation in the U.K. Techniques for extracting surface-current, surface-wind and directional sea-wave spectrum from first and second-order sea-echo are described, with reference to the influence of the antenna directivity and propagation factors. The special factors affecting ship-tracking in range, azimuth and Doppler are illustrated. The second part of the review concerns the use of sky-wave radar for sea-state sensing and for assessing the ionospheric layer configuration and propagation mode patterns. Sea-state sensing is shown to require real-time propagation assessment for effective frequency-management. Rapid sweep-frequency, sweep-azimuth and Doppler analysis are shown to be desirable. Author

Descriptors:

• *Radar tracking
• *Surface targets
• *Doppler radar
• *Remote detectors
• *Electromagnetic scattering
• Ships
• Ground waves(Electromagnetic)
• Coastal regions
• Ionosphere
• Sea states
• Test and evaluation
• Real time
• High frequency
• Patterns
• Detection
• Scattering
• Layers
• Propagation
• Doppler systems
• Installation
• Radar

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE