Rapid DSSS Signal Acquisition Algorithm under High Dynamic Environment
LIU Xiaoming① ZHANG He② WU Haowei② OU Jinglan②
①(College of Communication Engineering, Chongqing University, Chongqing 400044, China) ②(Center of Communication and Tracking Telemetering & Command, Chongqing University, Chongqing 400044, China)
For high speed and high dynamic receiver, using long pseudo-noise code, seriously affected by Doppler frequency offset, this paper proposes a double dwell pseudo-noise code acquisition method based on Compressed Code Phase Correlator (CCPC) and FFT. In the first dwell search a rapid and rough compressed search is performed for some neighboring code phase using CCPC, and at the same time the parallel search for Doppler frequency offset using FFT is completed. In the second dwell, all the neighboring code phases acquired in the first dwell are searched accurately using conventional correlator. The theoretical performance analysis model for the proposed method is presented, whose correctness is validated by Monte Carlo simulation. The simulation result shows that the proposed method has obvious advantages compared to Two-Dimensional Compressed Correlator (TDCC) on Mean Acquisition Time (MAT), as well as on the bandwidth and precision of Doppler frequency. Less resources are consumed than other methods based on FFT when using long pseudo-noise code.
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