Comments on ´constant false-alarm rate algorithm based on test cell information´

In a recent paper, Cao proposed and analysed a new switching constant false-alarm rate (CFAR) detection algorithm (S-CFAR), which exploits the magnitude of the test cell for the selection of the reference samples. Here we use the order statistic theory to obtain alternative expressions for the detection probability and the false-alarm rate of the S-CFAR in homogeneous background. They are not bulky and thus are easy to calculate for the thresholding parameters.