The invention discloses a two-dimensional parallel acquisition
system in
spread spectrum communication, which comprises a detection part and a check part. A data preprocessing unit in the detection part performs down-conversion and down-sampling to signals and simultaneously performs down sampling to local codes, results are saved in a buffer memory I, then the results are transmitted to partial matching filters for computation, the results are saved in a buffer memory II, then the results are sequentially transmitted to an FFT (
Fast Fourier Transform) and incoherent accumulation unit, the results are saved in a buffer memory III, finally the results are transmitted to peak searching unit for searching for a code phase a
Doppler frequency offset corresponding to a maximum value, and the results are transmitted to the check part; a code time
delay unit and a
frequency offset compensation unit in the check part respectively perform code time delaying and
signal frequency offset compensation to the detection results, the results are transmitted to an accumulation unit for coherent and incoherent accumulation, then the results are transmitted to a
control unit for threshold judgment, the acquisition is successful if the results exceed a threshold, otherwise, the acquisition of a next section is performed and the acquisition is failed if all code phases are traversed. The two-dimensional parallel acquisition
system in
spread spectrum communication has the beneficial effects that the parallel acquisition of the code phase and the
Doppler frequency offset is realized through a streamline method and the acquisition efficiency is greatly improved.