Multiple-receiver and multiple-frequency radar imaging techniques used with VHF atmospheric radar can improve, respectively, angular and range resolutions of the atmospheric irregularity structure inside the radar volume. A number of applications to the atmosphere have been implemented with the two imaging techniques: thin layer structures, wave activities, KHI billows, double layer structures, and so on. It can also retrieve 3-dimensional atmospheric irregularity structure by combining the two imaging techniques.
Several high-resolution observations of atmospheric structures will be shown. However, some practical problems in using the imaging techniques will also be discussed, such as phase bias, range-weighting and beam-weighting effects.