Satellite communications systems' performance at EHF and SHF. LOW Probability of Intercept (LPI) analysis shows the effect of scenario-dependent parameters and detectability-threshold factors in jamming and nonjamming environments. The most significant improvement in LPI performance may be obtained by operating at Extremely High Frequency (EHF) and by maximizing the effective spread-spectrum processing gain and the communicator's antenna discrimination to the jamming signal, and by minimizing

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... e number of symbols in the message. T o illustrate this effect, the LPI performance between a n airborne command post and two advanced satellite-communications systems were analyzed in this paper. The two satellite systems analyzed operate at Super High Frequency (SHF) (8/7 GHz) and EHF (44/20 GHz). Although this analysis was made for the airborne command post/satellite scenario, it is directly applicable to other scenarios such as surface ships communicating to airborne relays or submarines communicating to satellites.