Comparison of detectability of radar compression waveforms in classic passive receivers

Several types of passive receivers can be used to detect radar emissions over considerable distances. Previous work has been performed which compares the detectability of bi-phase waveforms to a classic rectangular pulse. It is also of interest to compare the detectability of equal-bandwidth/equal-energy FMCW, quadriphase, and polyphase waveforms. The quadriphase waveform is the quadriphase version of the bi-phase Welti code. The polyphase waveforms are the PI, P2, P3, and P4 codes. Relative detection ranges are predicted using a simulation of the square-law, wideband crystal video, and channelized passive receivers possessing typical bandwidth, noise-floor, and loss parameters. A comparison is given showing the relative LPI/LPD attributes of each waveform and the relative detection attributes of each receiver.