Volume 41 Issue 6
Nov.  2021
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Article Navigation >  Chinese Journal of Space Science  > 2021  >  41(6): 976-982
ZHANG Jun, ZHENG Lirong, LIN Baojun, SHEN Yuan, GONG Wenbing, SHUAI Tao. Optimization and Implementation of Two-dimensional Fast Acquiring DSSS Burst Datagram Communication for LEO Satellite Constellation[J]. Chinese Journal of Space Science, 2021, 41(6): 976-982. doi: 10.11728/cjss2021.06.976
Citation: ZHANG Jun, ZHENG Lirong, LIN Baojun, SHEN Yuan, GONG Wenbing, SHUAI Tao. Optimization and Implementation of Two-dimensional Fast Acquiring DSSS Burst Datagram Communication for LEO Satellite Constellation[J]. Chinese Journal of Space Science, 2021, 41(6): 976-982. doi: 10.11728/cjss2021.06.976
shu

Optimization and Implementation of Two-dimensional Fast Acquiring DSSS Burst Datagram Communication for LEO Satellite Constellation

doi: 10.11728/cjss2021.06.976 cstr: 32142.14.cjss2021.06.976

  • 1. School of Information Science and Engineering, Fudan University, Shanghai 200433;

  • 2. Innovation Academy for Microsatellites, Chinese Academy of Sciences, Shanghai 201203;

  • 3. University of Chinese Academy of Sciences, Beijing 100049;

  • 4. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030

  • Received Date: 2020-08-14
  • Rev Recd Date: 2021-08-19
  • Publish Date: 2021-11-15
    Abstract
  • Large Doppler shifts and extremely weak signal in the condition of short datagram burst LEO satellite communication are always the technical challenges for fast acquisition receiver. Firstly, the influence of Doppler characteristics on the fast acquisition of LEO satellite spread spectrum signal is analyzed, and the advantages and disadvantages of different acquisition strategies are discussed. Based on double-sampling zero-padding technology of partial matched filter and Fast Fourier Transform (FFT), Optimization and implementation of two-dimensional parallel fast acquiring Direct Sequence Spread Spectrum (DSSS) signal processing method is presented. Different from the single sampling scheme in which the input signal is sampled according to the chip rate, the double sampling scheme has two sampling signals reaching the correlator in each chip time. That is, the correlator works on a clock with twice than the chip rate. The correlator selects a sampling signal at each interval and inputs it to the PN code part correlator for correlation operation, and then outputs the maximum value after passing through the FFT module and energy accumulation module for judgment. Therefore, the maximum sampling signal-to-noise ratio loss is about 0.9 dB, which greatly improves the performance compared with the single sampling method. Finally, combined with the decision oriented carrier forward estimation and PN code feedback synchronization technology, the actual test shows that the average acquisition time of the receiver is 10 ms, which is much lower than the tradition parallel acquisition time of PN sequence code in seconds order. It can better meet the service requirements of short datagram burst communication system with random access for LEO satellite constellation.

     

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