Cross-frequency correlations of intensity fluctuations of a wave field scattered by a random medium contain useful information both about the source and the medium. In a previous paper expressions were obtained for such cross-correlations in the case of multiple scatter. The present paper examines the range of validity of these results and compares theoretical cross-spectra with those obtained by numerical simulations. We conclude that our previous results have a limited range of validity and that a new method of evaluating the exact multiple convolution solution is needed.
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Miller et al. (1986) studied this question.
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