The book begins with a basic discussion of the Doppler effect and its various applications, and how Doppler radar can be used for the stabilization and navigation of aircraft. A quasi-static approximation of the Doppler spectrum is presented along with illustrations and discussions to help the reader gain an intuitive understanding of the approximation and its limitations. A summary of the mathematical concepts required for development of an exact theory is then presented using the case of a narrow beam antenna. This is followed by the development of the exact theory for the general case, which is graphically illustrated and compared with the quasi-static approximation. General conditions for which the quasi-static approximation error would be excessive – specifically as applied to laser Doppler radars and low-flying aircraft – are presented.- Data and information appearing in this book are for informational purposes only. AIAA and the author are not responsible for any injury or damage resulting from use or reliance, nor do AIAA and the author warrant that use or reliance will be free from privately owned rights..