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Volume 32 Issue 6
Jun.  2010
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Li Tao-hu, Liu Jian-sheng, Huang Zhi-gang, Qin Hong-lei. A Solution of the Near-Far Effect Based on the Orthogonality of Pseudolite Signal[J]. Journal of Electronics & Information Technology, 2010, 32(6): 1366-1369. doi: 10.3724/SP.J.1146.2009.00784
Citation: Li Tao-hu, Liu Jian-sheng, Huang Zhi-gang, Qin Hong-lei. A Solution of the Near-Far Effect Based on the Orthogonality of Pseudolite Signal[J]. Journal of Electronics & Information Technology, 2010, 32(6): 1366-1369. doi: 10.3724/SP.J.1146.2009.00784

A Solution of the Near-Far Effect Based on the Orthogonality of Pseudolite Signal

doi: 10.3724/SP.J.1146.2009.00784
  • Received Date: 2009-05-22
  • Rev Recd Date: 2009-12-11
  • Publish Date: 2010-06-19
  • The main difficulty in the use of pseudolites is the near-far effect, where the strong signal component prevents a conventional receiver from detecting the weak component. A new solution based on the orthogonality of the pseudolite signal is presented, which constructs the orthogonal projection of the strong component and then cancels out this projection from the received signal to reduce the interference of the strong component on acquiring the weaker. This solution needs neither to modify the receivers hardware nor to estimate the amplitude of the signal component. Simulation results shows that, at the same acquisition probability of 90%, the performance of near-far resistance of this new method compared with conventional sliding detector is improved about 9 dB.
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