Open Access Open Access  Restricted Access Subscription Access
CFAR processor with square-law detector and range resolution cells

Heterogeneous performance evaluation of sophisticated versions of CFAR detection schemes

Mohamed Bakry El Mashade


The detection of radar targets in a background, the statistical parameters of which are unknown and may not be stationary, can be effectively achieved through CFAR processors. The CA-CFAR scheme performs optimally for homogeneous and exponentially distributed clutter observations. However, it exhibits severe performance degradation in the presence of outlying target returns in the reference set or in regions of abrupt change in the background clutter power. The OS-CFAR processor has been proposed to solve both of these problems. Although this processor may treat target multiplicity quite well, it lacks effectiveness in preventing excessive false alarms during clutter power transitions. The TM-CFAR algorithm, which implements trimmed averaging after ordering, can be considered as a modified version of OS technique. By knowingly trimming the ordered samples, the TM detector may actually perform better than the OS processor. To simultaneously exploit the merits of CA, OS, and TM schemes, two combinations namely CAOS and CATM have been suggested. Each one of these versions optimizes good features of two CFAR detectors, depending on the characteristics of clutter and searched targets, with the goal of enhancing the detection performance under constant level of false alarm. It is realized by parallel operation of two standard types of CFAR schemes. Our goal in this paper is to analyze these two developed versions in heterogeneous situations, to show to what extent they can improve the behavior of the conventional CFAR processors.


SNR; CFAR detection; clutter edge; spurious target; fluctuating target; receiver operating characteristics; ROC; signal-to-noise ratio

Full Text:



GANDHI, P.P.; KASSAM, S.A. Analysis of CFAR processors in homogeneous background. IEEE Trans. Aerosp. Electron. Syst., v.14, n.4, p.427-445, 1988. doi:

EL MASHADE, M.B. Performance analysis of modified ordered-statistics CFAR processors in nonhomogeneous environments. Signal Processing, v.41, n.3, p.379-389, 1995. doi:

EL MASHADE M.B. Monopulse detection analysis of the trimmed mean level CFAR processor in nonhomogeneous situations. IEE Radar, Sonar Navig., v.143, n.2, p.87-94, 1996. doi:

EL MASHADE, M.B. Detection analysis of linearly combined order statistic CFAR algorithms in nonhomogeneous background environments. Signal Processing, v.68, n.1, p.59-71, 1998. doi:

EL MASHADE, M.B. M-sweeps exact performance analysis of OS modified versions in nonhomogeneous environments. IEICE Trans. Commun., v.E88-B, n.7, p.2918-2927, 2005. doi:

EL MASHADE, M.B. Analysis of cell-averaging based detectors for c2 fluctuating targets in multitarget environments. J. Electron. (China), v.23, n.6, p.853-863, 2006. doi:

EL MASHADE, M.B. Performance analysis of OS structure of CFAR detectors in fluctuating target environments. PIER C, v.2, p.127-158, 2008. doi:

MAGAZ, B.; BELOUCHRANI, A.; HAMADOUCHE, M. A new adaptive linear combined CFAR detector in presence of interfering targets. PIER B, v.34, p.367-387, 2011. doi:

EL MASHADE, M.B. Analysis of adaptive detection of moderately fluctuating radar targets in target multiplicity environments. J. Franklin Inst., v.348, n.6, p.941-972, 2011. doi:

EL MASHADE, M.B. Performance analysis of CFAR detection of fluctuating radar targets in nonideal operating environments. Int. J. Aerospace Sci., v.1, n.3, p.21-35, 2012. doi:

WANG, W.Q. Radar Systems: Technology, Principles and Applications. Nova Sci. Pub., Inc., 2013.

EL MASHADE, M.B. Analytical performance evaluation of adaptive detection of fluctuating radar targets. Radioelectron. Commun. Syst., v.56, n.7, p.321-334, 2013. doi:

IVKOVIĆ, DEJAN; ANDRIĆ, MILENKO; ZRNIĆ, BOJAN. A new model of CFAR detector. Frequenz, v.68, n.3-4, p.125-136, Mar. 2014. doi:

EL MASHADE, M.B. Performance enhancement of the conventional CFAR processors in ideal and multitarget environments. Radioelectron. Commun. Syst., v.57, n.7, p.287-305, 2014. doi:

IVKOVIĆ, DEJAN; ANDRIĆ, MILENKO; ZRNIĆ, BOJAN. False alarm analysis of the CATM-CFAR in presence of clutter edge. Radioengineering, v.23, n.1, p.66-72, 2014.



  • There are currently no refbacks.

© Radioelectronics and Communications Systems, 2004–2017
When you copy an active link to the material is required
ISSN 1934-8061 (Online), ISSN 0735-2727 (Print)
tel./fax +38044 204-82-31, 204-90-41