JIA Qiong-qiong, WU Ren-biao, WANG Wen-yi, LU Dan, WANG Lu. Multipath interference suppression algorithm based on spatial signal separation[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 151-158.
Citation: JIA Qiong-qiong, WU Ren-biao, WANG Wen-yi, LU Dan, WANG Lu. Multipath interference suppression algorithm based on spatial signal separation[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 151-158.

Multipath interference suppression algorithm based on spatial signal separation

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  • Author Bio:

    JIA Qiong-qiong(1986-), female, lecturer, master of engineering, +86-22-24092451, qiongjiawei@163.com

  • Received Date: 2016-10-21
  • Publish Date: 2017-04-25
  • Aiming at the multipath interference suppression problem in global navigation satellite system (GNSS), an efficient multipath interference suppression algorithm with low complexity was proposed.Under the unknown directions of arrival (DOAs) of direct signal and multipath interference, the RELAX algorithm was used to estimate the DOAs and amplitudes of direct signal and multipath interference one by one through repeated iteration idea, and then to distinguish multipath interference.The beam forming technology without distortion based on linearly constrained minimum variance (LCMV) was used to form gain at direct signal direction and null at multipath interference direction, and then to suppress multipath interference.The simulation test was carried out.Analysis result shows that when multipath interferences are partially coherent, the root mean square error of DOA estimated by RELAX algorithm is about 12 dB lower than the value estimated by MUSIC algorithm. When multipath interferences are completely coherent, the root mean square error of DOA estimated by RELAX algorithm is about 25 dB lower than the value estimated by MUSIC algorithm.The proposed algorithm can accurately estimate the DOAs of direct signal and multipath interference, which can ensure nulling the multipath interference in airspace through beam forming to make the signal enteringthe tracking loop very clean.The processed tracking error of code phase is close to 0.

     

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