吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (6): 1838-1842.doi: 10.13229/j.cnki.jdxbgxb201406046

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Searching range prediction based on Doppler frequency shift estimation method in direct spread spectrum systems

HU Mei-xia1, LIU Yi1, LU Man-hong2, ZHANG Zhao-wei1, LI Yong-zhao1   

  1. 1.State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China;
    2.Telemetry Technology Institute, Beijing 100076, China
  • Received:2013-06-25 Online:2014-11-01 Published:2014-11-01

Abstract: To improve the unreliable Doppler frequency estimation under the condition of extremely low SNR and high dynamic state, a searching range prediction method was proposed based on Doppler frequency shift estimation used in spread spectrum systems. Using Doppler frequency variation limitation over adjacent two received signals, the proposed method narrows the searching range of the later estimations from the previous estimation results, thus, enhancing the estimation reliability. Simulation results show that this proposed method can effectively increase the Doppler detection reliability.

Key words: information processing, extremely low SNR, high dynamic, Doppler estimation, searching prediction

CLC Number: 

  • TN914.42
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