abilities are discussed in detail. is received by the antenna and feed, passed through the II. MAJOR SUBSYSTEM FUNCTIONS A. Doppler Extraction 1 In the doppler extraction function diagrammed in Fig. 2, the exciter output carrier frequency (Ft) at S-band n (2100 to 2110 mc) has a precision based… … are suitably combined and shifted coherently to simulate Fig. 2. Doppler extraction function