Patent ID: 8194766

Claim:
A signal detection apparatus, comprising: electronics configured to receive an RF input and to process the RF input applying a decision rule that utilizes Fast Fourier Transforms (FFTs) of non-overlapping subsequences for a window function to generate K decision statistics whose cumulative distribution function (cdf) yield, independent of the noise variance and the FFT window type, a numerical value for the threshold, τ, of each decision statistic to determine if a man-made signal is present or to achieve a constant false alarm rate when only noise is present; wherein each of the decision statistics, denoted as C M (l) for l εκ, has a cumulative distribution function (cdf), which is equal to F C M (τ), as follows F C M ⁡ ( τ ) = 1 - Γ ⁡ ( M + L ) Γ ⁡ ( M ) ⁢ Γ ⁡ ( L ) ⁢ ∫ 0 1 - τ ⁢ t L - 1 ⁡ ( 1 - t ) M - 1 ⁢ ⅆ t with M=number of N -pt FFTs to be computed, K=the number of FFT bins to be included in the decision statistics, κ=the set of FFT bins to be included in the decision statistics, L =M(K−1), and Γ(n)=(n−1)! for a positive integer n.