Recently, researches for multi-dimensional superresolution techniques have made great progress. Especially, it is desired for space-time techniques to apply to communication systems as well as sensings. The resolution property of the methods in the presence of incoherent waves incidence can be easily estimated by difference of direction of arrival (DOA) and time-delay (TD) among signals. However, in case of coherent waves incidence. they highly depends on the decorrelation performance of SSP or MSSP. In this report we discuss the estimation error of 2-D MUSIC algorithms in case of incoherent and coherent incidence. respectively, and derive relation between estimation error cud signal decorrelation properties.
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