Theoretical performance limits on tropospheric refractivity estimation using point-to-point microwave measurements
Ducted propagation above the ocean surface can seriously impact shipboard radar and communications. Point-to-point microwave measurements have been proposed as a means of estimating tropospheric refractivity for the purposes of characterizing surface-based ducts. This paper addresses the theoretical performance of refractivity estimates that can be made by combining field measurements at different frequencies with prior statistics of refractivity variation. Parameterizing the refractivity profile using empirical orthogonal functions derived from a historical database, both Cramer-Rao performance bounds and the maximum a posteriori (MAP) estimate are discussed using coherent or incoherent signals. Results obtained using a realistic model of refractivity conditions off Southern California suggest that multifrequency propagation measurements can significantly improve the estimation of refractivity and propagation loss profiles.
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Related Subject Headings
- Networking & Telecommunications
- 4009 Electronics, sensors and digital hardware
- 4008 Electrical engineering
- 4006 Communications engineering
- 1005 Communications Technologies
- 0906 Electrical and Electronic Engineering
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Networking & Telecommunications
- 4009 Electronics, sensors and digital hardware
- 4008 Electrical engineering
- 4006 Communications engineering
- 1005 Communications Technologies
- 0906 Electrical and Electronic Engineering