Ultrawide-band radar imagery from multiple incoherent frequency subband measurements

The problem of combined radar imagery from multiple sparse frequency subbands initially incoherent to each other is of practical importance for radar target discrimination. A new coherent processing technique based on probability density analysis of the subband data is proposed, which is applicable for radar imaging from measurements of two or more initially incoherent radar subbands. The coherence parameters for both amplitude and phase are obtained by combining modern spectral analysis with probability density estimation. The major advantage of the proposed technique lies in that it enables much more robust cohering for the sparse subband data of real-world complex targets.