Abstract: Aiming at the problem of quantify the influence of the channel group delay distortion on the performance of DS/FH hybrid spread spectrum signals, in this paper, from the point of view of correlation characteristics of hybrid spread spectrum signals, the expressions of correlation characteristics after the effects of group delay distortion are derived, and the correlation peak loss and its position deviation under different group delay distortion types are calculated by numerical integration, in this way, the influence of group delay distortion on the reception performance of hybrid spread spectrum signals is quantified. Calculation results show that with the gradual deterioration of group delay distortion the relative peaks will continue to decrease until they disappear, meanwhile, the group delay distortion also causes the fission and position offset of the related peaks, which has a negative effect on the spread spectrum signal applied to the measurement system.

Key words: DS/FH hybrid spread spectrum, group delay distortion;correlation characteristics