High-frequency surface wave radar performance analysis for CA-CFAR algorithm in Weibull-distributed clutter

Diego da Silva de Medeiros; Rômulo Fernandes da Costa; Dimas Irion Alves; Renato Machado; Osamu Saotome

doi:10.1117/12.2636035

28 October 2022 High-frequency surface wave radar performance analysis for CA-CFAR algorithm in Weibull-distributed clutter

Diego da Silva de Medeiros, Rômulo Fernandes da Costa, Dimas Irion Alves, Renato Machado, Osamu Saotome

Author Affiliations +

Proceedings Volume 12263, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2022; 1226302 (2022) https://doi.org/10.1117/12.2636035
Event: SPIE Remote Sensing, 2022, Berlin, Germany

Abstract

In High-Frequency Surface Wave Radar applications (HFSWR), targets at close range are often masked by very strong sea clutter returns in the range-Doppler spectrum. The clutter is highly non-homogeneous in the Doppler dimension, presenting two peaks at resonance Doppler frequencies, referred to as Bragg lines, and several smaller side peaks. Due to this complex scattering mechanism, a Gaussian assumption for clutter returns does not hold, and several works propose modeling sea clutter returns in HF range-Doppler spectra as a Weibull distribution. This work presents an analysis of the performance of a cell-averaging constant false alarm rate (CA-CFAR) algorithm designed for Weibull-distributed clutter. A closed-form probability of detection of the Weibull CACFAR is compared to a numerical simulation of sea clutter based on a physical model of sea radar cross-section (RCS). The clutter model takes into consideration wind conditions, as well as the operating parameters of the radar. It is demonstrated through numerical simulation of the physical model that the clutter echo distribution, depending on the sampling position in the range-Doppler spectrum and proximity to a Bragg line, can take the form of an exponential or a Rayleigh distribution. Thus, the overall distribution of clutter returns can be represented by a Weibull model. Results indicate that the closed-form analytical expression act as an upper bound for detector performance, that is, in practice, degraded by the strong peaks of the clutter power.

Conference Presentation

Citation Download Citation

Diego da Silva de Medeiros, Rômulo Fernandes da Costa, Dimas Irion Alves, Renato Machado, and Osamu Saotome "High-frequency surface wave radar performance analysis for CA-CFAR algorithm in Weibull-distributed clutter", Proc. SPIE 12263, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2022, 1226302 (28 October 2022); https://doi.org/10.1117/12.2636035

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available