Analysis and evaluation of Project Evergreen data
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Project Evergreen was an experiment conducted to evaluate antenna responses to nanosecond pulses and the capability of broadband equipment to capture them. The two antennas tested were a log periodic antenna modified by Lawrence Livermore National Laboratories and a TEM horn antenna. Analysis of the data collected by the Naval Postgraduate School test site personnel indicated the following: (1) The antenna output response characteristic is different for the log periodic antenna and the TEM horn antenna. (2) The received polarization is a function of the transmitted polarization and the orientation of the receiving site relative to the transmitting site. (3) Signal strength and capture are a function of the polarization alignment of the transmitting and receiving antenna. (4) Pulses on the order of 1 to 10 nanoseconds require bandwidth exceeding 1 Gigahertz (GHz) in the transmitting and receiving equipment. (5) Broadband equipment with minimum bandwidths of 1 GHz are required to adequately capture and process extremely short time duration signals
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