Correlation of PN Spread Spectrum Signal Under First-Order Dynamics
Guo Gui-rong · Dianzi xuebao · 2007
In direct sequence spread spectrum systems,due to dynamic factors such as the relative motion between the transmitter and the receiver and the instability of clock,there is code-frequency offset between the received and the local PN codes.In this paper,assuming first-order dynamic,namely,constant code-frequency offset,the formulas for the correlation function of PN code are derived for the first time by the method of integrating the normal PN code correlation function with an integration time interval of arbitrary length and then verified by simulation.Accordingly the characteristics of PN code correlation function under first-order dynamic are studied,including spread of main-lobe,shift and loss of peak.The conclusions drawn in this paper can guide the design of code synchronization in high dynamic receiver.