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Area of Science:

  • Satellite Navigation Systems
  • Signal Processing
  • Wireless Communications

Background:

  • Inter-satellite links are crucial for next-generation navigation systems.
  • Low signal-to-noise ratio (SNR) and interference complicate signal acquisition.
  • Existing long code acquisition methods like XFAST and DF-XFAST have limitations in dynamic environments.

Purpose of the Study:

  • To propose a novel long code acquisition algorithm for inter-satellite links.
  • To address the challenges of low SNR, high dynamics, and code Doppler.
  • To improve acquisition performance and speed in challenging satellite communication scenarios.

Main Methods:

  • Developed a dual-channel acquisition method based on the extended replica folding algorithm (DC-XFAST).
  • Employs dual channels with folded and zero-padded local code samples.
  • Utilizes circular Fast Fourier Transform (FFT) for correlation and peak detection.

Main Results:

  • DC-XFAST demonstrates significantly higher acquisition probability than XFAST and DF-XFAST.
  • The method achieves improved detection probability and lower false alarm rates.
  • Numerical results confirm enhanced acquisition performance with guaranteed speed.

Conclusions:

  • DC-XFAST offers superior long code acquisition for inter-satellite links.
  • The algorithm effectively mitigates challenges posed by low SNR and code Doppler.
  • DC-XFAST provides a faster mean acquisition time compared to traditional methods.