Optical Communication Technology, Volume. 47, Issue 6, 48(2023)
Improved PMF-FFT algorithm for fast acquisition of low-orbit internet of things signals
In order to achieve rapid capture of low-rail IoT signals under the conditions of high dynamic and low signal-to-noise ratio, a partial matching filter-fast Fourier transform (PMF-FFT)improvement algorithm for rapid capture of low-rail IoT signals is proposed. First of all, the ephemeris information is used to predict the Doppler frequency bias and narrow the frequency domain search range; then, the scallop loss of PMF-FFT algorithm is overcomed by zero padding and windowing. Finally, the frequency domain differential incohere accumulation is used to improve the output gain under low signal-to-noise ratio. The simulation analysis shows that the proposed algorithm can improve the detection probability of low-orbit iot signal when the signal-to-noise ratio is -25~-15 dB, and the search range is reduced from 15~35 kHz to 24.8~25.2 kHz.
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QI Hupeng, BIAN Dongming, ZHANG Gengxin. Improved PMF-FFT algorithm for fast acquisition of low-orbit internet of things signals[J]. Optical Communication Technology, 2023, 47(6): 48
Received: Jun. 3, 2023
Accepted: --
Published Online: Feb. 2, 2024
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