There are important applications where radars are required to observe large volumes of space and map the entire contents thereof on a continual basis. This calls for a different approach to signal processing and data processing and presentation from the more familiar point-target detection situation. The weather radar is a fine example of a volumetric radar. This paper describes some important aspects of signal and data processing in modern weather radars. These radars differ from older ones of the family in being coherent and having multi-parameter observation and measurement capability. The signal processing in such radars involves filtering for signal-to-noise ratio enhancement and clutter rejection, and data processing has many levels, ranging from moment extraction, through feature extraction, to sophisticated display organisation. These complex processes are greatly assisted by computer hardware and software which have made the modern weather radar a very powerful and user-friendly device. P.R. Mahapatra, Ph.D. Professor Department of Aerospace Engineering, Indian Institut of Science, Bangalore Indi
