Analysis of Single Demodulation of Composite Continuous Wave Signal Modulated by Pseudorandom Code Family

Abstract

In this paper, a new kind of composite continuous wave signal modulated by pseudorandom code family is designed aiming at solving the problem of group targets resolution with high dynamic: more quantity, larger speed variation, larger distribution and higher resolution. With a thumbtacked ambiguity, the new composite signal retained the advantage of pseudo code signal with high 2 dimensional resolution of speed and range. Furthermore, a new single demodulation method is proposed for this modulated signal. This method brings the characteristic of multi-resolution for the composite signal. Single demodulation method has been proved to be feasible through the correlation analysis and fuzzy characteristics analysis of sub-signal from the composite signal. Meanwhile, the realization process of signal multiresolution is illustrated by an example. At last, recommendations pertaining to signal selection, number option and usage are put forward for this signal modulated by pseudo-code family and this single demodulation method. The study of this paper is helpful for group targets resolution and is also of great importance to improve complex waveform design and performance.