Detection Performance of Or-ing Device with Pre- and Post-Averaging: Part 3.Deterministic Signal

摘要

The detection performance of an 'or-ing' device with pre-averaging and post-averaging has been determined in the form of numerous receiver operating characteristics covering a wide range of input signal-to-noise ratios. Numerical evaluation of the false alarm probability P (sub f) and detection probability P(sub d) has been conducted for the case of a phase-incoherant signal in the presence of additive Gaussian noise for a wide range of values of K, the amount of pre-averaging before 'or-ing;' N, the number of channels or-ed; and M, the amount of post-averaging after 'or-ing.' A MATLAB program that can be used to extend these results to parameter values outside the range studied here is also listed. The tradeoffs associated with switching from post-averaging to pre-averaging, or vice-versa, have been thoroughly investigated and tabulated for a standard operating point (Pf=1E-3, pd=0.5) and for a high-quality operating point (Pf=1E-6, Pd-0.9). The losses associated with doing too little pre-averaging can be severe, especially for large number, N, of 'or-ed' channels.