(3)stochastic signals or random signals stochastic signal x(t)=s(t)+v(t) (random process) electronic reconnaissance receiving signal; seismic signal monitoring; astronomical observing signal; passive radar signal; sonar signal and so on. UESTC 8UESTC 何子述等 8 (3) stochastic signals or random signals x t s t v t ( ) ( ) ( ) = + electronic reconnaissance receiving signal; seismic signal monitoring; astronomical observing signal; passive radar signal; sonar signal and so on. stochastic signal (random process)