Detection of low probability of intercept signals in low SNR using multichannel sensor arrays

In this paper, a method is proposed for the detection of low probability of intercept, LPI signals in high noise without prior knowledge and assumption using spatially distributed multichannel wideband sensor array. The proposed detection method uses eigenvalue ratios (EVR) of wideband spatial covariance matrix as test statistic. It is shown in simulations that the proposed method can detect long code spread spectrum signals in a stable way even in low SNR. In addition, it is also shown in simulations that the proposed method is inherently resistive to the multipath reflections.