For decades, radar has been used to observe and monitor aerial animals 1-4. Nowadays, radar has started to play a valuable role in entomology for investigating the behavior of flying insects beyond visible range, and contributing to many development researches in biological and ecological advances 5-11. Although radar had proved to be a powerful tool in these applications, its utility for detecting and distinguishing between different biological targets is limited. Biological targets identification has always been a challenge in entomological radar applications. In these applications, the electromagnetic energy is radiated to and reflected (echoed) back from the intercepting target which provides an accurate measurement used in determining the location of the target 12-13.
The intensity of the echo is described explicitly by the radar cross section (RCS) of the object. Values of the RCS are dependent on number of factors, such as the size, shape, material, and aspect of the target as well as the wavelength and polarization of the transmitted radiation with respect to the orientation of the target.