  This article develops the multiple-input multiple-output (MIMO) technology
for weather radar sensing. There are ample advantages of MIMO that have been
highlighted that can improve the spatial resolution of the observations and
also the accuracy of the radar variables. These concepts have been introduced
here pertaining to weather radar observations with supporting simulations
demonstrating improvements to existing phased array technology. Already MIMO is
being used in a big way for hard target detection and tracking and also in the
automotive radar industry and it offers similar improvements for weather radar
observations. Some of the benefits are discussed here with a phased array
platform in mind which offers quadrant outputs.
