Abstract
In this paper, we attempt to give an overview of the general concepts of spatial and frequency domain interferometry. The emphasis is placed on fundamentals, so that the uninitiated reader will be able to grasp the basic ideas behind these subjects. In addition, recent research using the MU radar is reviewed as logical results of these fundamental concepts. In particular, the spatial domain interferometer has been shown to be useful in full two-dimensional steering of the antenna beam, after the data has been stored in a multi-receiver configuration. This is an improvement over previously published research, which was limited to one dimension. Also, a new technique for estimating the three-dimensional wind vector using spatial domain interferometry has been developed. It has been shown that this method is well suited for the estimation of the vertical wind component. The improvement in the vertical velocity estimate is based on the fact that this technique eliminates the effect of tilted refractivity layers on VHF echoes. It has been shown that the vertical wind estimate based on the Doppler technique is biased by the horizontal wind. In addition, the basic concepts of frequency domain interferometry are presented, with examples of recent developments in tracking of thin, high-reflectivity layers within the resolution volume of the radar.
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