On the power spectral density of FSK/PSK radar signals corrupted by oscillator phase noise

FSK/PSK radar signals are pulse compression signals that combine direct sequence spread spectrum with frequency-hopping. It has been shown that if the FSK signal is properly combined with the direct sequence (PSK) signal, then the near ideal ambiguity properties of a Welch encoded FSK signal can be preserved while simultaneously increasing the LPI characteristics of the signal. One concern with FSK/PSK signaling radars is the effect of phase noise on the ability of these radars to detect moving targets in high ground clutter environments. A rigorous analysis of radar systems having multiple phase noise sources could not be found that addressed this problem in the open literature. The authors address this problem in such a manner as to provide a comparison between the predicted performance of FSK/PSK signaling radars and other more conventional radar systems