We evaluate the performances of several distributed constant false-alarm ra
te (CFAR) tests operating in different background clutter conditions. The a
nalysis considers the detection of Rayleigh target in various clatters with
the possibility of differing clutter power levels in the test cells of dis
tributed radars. Numerical results studied for a two-radar system show how
the false-alarm rate of the maximum order statistic (MOS) test changes with
differences In the clutter power levels of the test cells. The analysis fo
r the defection of Rayleigh target In Rayleigh clutter indicates that, with
the power levels of differing test cells, the OR fusion rule can be quite
competitive with the new normalized test statistic (NTS). However, for the
detection of Rayleigh target in Weibull or K-distributed clutter, the resul
ts show that NTS outperforms both the OR and the AND rules under the condit
ion of large signal-to-clutter power ratio and moderate shape parameter val
ues.