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Low Computational Signal Acquisition for GNSS Receivers Using a Resampling Strategy and Variable Circular Correlation

Yeqing Zhang1, Meiling Wang2, Yafeng Li3

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Summary

This study introduces resampling and variable circular correlation time strategies for Global Navigation Satellite System (GNSS) receivers. These methods significantly reduce computational complexity and time for signal acquisition, with minimal impact on sensitivity.

Keywords:
GNSS receiversbandpass samplingcircular correlation timecomputational complexitysignal acquisitiontime consumption

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Area of Science:

  • * Navigation Systems
  • * Signal Processing

Background:

  • * Broadband Global Navigation Satellite System (GNSS) receivers face challenges with high computational complexity and time consumption during signal acquisition.
  • * Conventional acquisition algorithms require significant processing resources for broadband signals.

Purpose of the Study:

  • * To decrease computational complexity and time for signal acquisition in broadband multi-frequency GNSS receivers.
  • * To introduce a resampling strategy and a variable circular correlation time strategy.

Main Methods:

  • * A resampling strategy reduces the sampling frequency of the main lobe of received broadband signals.
  • * Variable circular correlation time adapts to varying signal strengths, enhancing operational flexibility.
  • * Computational complexity is formulated based on multiplication and summation operations.

Main Results:

  • * The resampling strategy reduced computation and time costs by 90-94% with slight loss in acquisition sensitivity.
  • * Increasing circular correlation time from 10 ms to 20 ms increased acquisition time by 2.7-5.6% per millisecond.
  • * Most satellites were acquired successfully under tested conditions.

Conclusions:

  • * The proposed strategies effectively reduce computational load and acquisition time for GNSS receivers.
  • * The resampling approach offers substantial efficiency gains with minimal performance trade-offs.
  • * Variable circular correlation time provides adaptable and flexible GNSS signal acquisition.