Acquisition Performance of a Synchronization Scheme of DS/FH Spread Spectrum TTC Signals
LU Weitao · Journal of Astronautics · 2010
For the high dynamic characteristics of TTC signals and doppler shift periodic hopping caused by carrier frequency hopping,a synchronization scheme of DS/FH spread spectrum signals based on a fast frequency identification method and aiding mechanism is proposed.The state transition mode of three-dimensional synchronization process in frequency hopping pattern,PN code phase and Doppler shift is given,and the expressions of the mean acquisition time and both detection probabilty and false alarming probability of an acquisition system are derived in the presence of PN code phase error,Doppler shift and Gaussian white noises.The impact of the signal and the acquisition system parameters on the acquisition performance is analyzed by numerical simulation in the case of the acquisition mode of matched filter in time domain and multiple channels in frequency domain.Results of theoretical derivation and simulation provide theoretical basis and practical reference for signal design and parameters selection of the acquisition system.