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Firstly, brief background of the topic , the practical significance of the research status and research algorithms and search strategies contrast , analysis of the spread spectrum signal in space communications quickly capture , and then captured from a variety of the spread spectrum signal , and thus to find a solution subjects needs algorithm . The paper focuses on two fast acquisition algorithm based on spectral analysis , respectively, the time domain parallel method and frequency domain parallel method . Principle , performance and features for both capture methods for analysis and simulation respectively , and put them in a low signal-to-noise ratio , large Doppler shift environment simulation , to discuss their specific performance , and finally By comparison , select the frequency domain parallel algorithm as the subject solutions. Finally, to borrow a common set of IF processing hardware platform , simulation and validation of the algorithm chosen , consistent with the results of its verification and simulation results . Ultimately determine the frequency domain parallel method based on spectral analysis algorithms to address the \
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