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A sonar detection scheme is presented using Constant False Alarm Rate (CFAR) techniques. The proposed system has the following advantage. The technique yields unbiased estimates under a non-homogenous underwater environment, because the false alarm rate is maintained at a constant level while the threshold changes with different underwater environments in the presence of interfering targets. A mathematical analysis is also being done for different CFAR processors with the interest on the CFAR losses. Average decision threshold (ADT) is used as a measure.