| Abstract: | The fundamental problems associated with radar methods of estimating the intensity of aerial biological activity are discussed. An equivalent number density is defined and adopted as a convenient and useful measure of activity. Three target concentration types are identified, and methods of density estimation for each type are described. A detailed study of the signal analysis aspects of the estimation problem for the intermediate concentration type is presented. The intermediate concentration problem is shown to be general, and to include the high and low concentration problems as its limiting forms. The precision of the estimates and the applicability of the estimation methods are discussed, and a number of comparisons with related results from radar meteorology are drawn. |
