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SCIENTIA SINICA Informationis, Volume 47 , Issue 7 : 928(2017) https://doi.org/10.1360/N112016-00201

Direct acquisition method of long PN-code based on the GPU

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  • ReceivedAug 22, 2016
  • AcceptedJan 20, 2017
  • PublishedJul 6, 2017

Abstract


Funded by

国家自然科学基金(61601485)

  • Figure 1

    Part correlation code phase space searching method

  • Figure 2

    Partly overlap segmentation and correlation of input samples

  • Figure 3

    Performance of coherent detection

  • Figure 4

    Gain of non-coherent accumulation

  • Figure 5

    Code phase acquisition results based on GPU. (a) Samples offset: 15000001, Doppler frequency: 0 Hz; protectłinebreak (b) samples offset: 15000001, Doppler frequency: 5 kHz; (c) zoom in (a) at 15000000 samples offset

  • Figure 6

    Doppler frequency estimation based on segment correlation

  • Table 1   Time consuming of implementation based on CPU and GPU
    Direct global
    searching algorithm
    Direct global
    searching algorithm
    Time consuming of CPU implementation (ms) 17600.3 4759.3
    Time consuming of GPU implementation (ms) 322.4 285.3
    Acceleration rate 54.6 16.7
  • Table 2   Each stage time consuming of direct acquisition algorithm based on GPU
    Stage of algorithm
    Direct global
    searching algorithm (ms)
    Direct global
    searching algorithm (ms)
    Zero padding and overlapping 19.6 44.9
    FFT of input signal 84.3 72.6
    FFT of local signal 84.2 0.1
    Conjugate multiplication 32.8 71.4
    IFFT 84.6 73.0
    Modulus 14.3 20.7
    Signal detection 2.6 2.6
    Total time consuming 322.4 285.3