SOME SPECIAL RADAR PROCEDURES AND APPLICATIONS
Since radar entered the domain of weather observing and forecasting, scientists concerned with meteorological problems have directed their attention to the development of special techniques for solving specific important problems.
An excellent example of a new electronic development for dealing with a meteorological problem is found in a radarscope presentation called Constant Altitude Plan Position Indicator or CAPPI for short. When studying large storm systems such as extensive squall lines, hurricanes, or winter cyclones, it is desirable to be able to observe the pattern of precipitation at a particular altitude. It is not possible with a conventional radar. Even if the radar antenna is pointed horizontally as it scans in a circle, the fact that the earth curves means that as the range increases the radar detects echoes at high elevations.
Scientists at McGill University, under the direction of J. Stewart Marshall, have solved this dilemma. They have developed a system in which the antenna elevation angle increases in steps while a "ring" of