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Design and Implementation of an RTK-Based Vector Phase Locked Loop.

Ahmad Shafaati1, Tao Lin2, Ali Broumandan3

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Summary
This summary is machine-generated.

A new double-differential vector phase-locked loop (DD-VPLL) enhances Global Navigation Satellite Systems (GNSS) receiver sensitivity. This method improves carrier phase tracking for better real-time kinematic (RTK) applications.

Keywords:
Global Navigation Satellite Systems (GNSS)RTKcarrier phase trackingvector tracking

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Area of Science:

  • * Navigation and Positioning Systems
  • * Signal Processing
  • * Geomatics Engineering

Background:

  • * Conventional scalar-based tracking loops (STL) and vector frequency locked loops (VFLL) in Global Navigation Satellite Systems (GNSS) receivers face limitations in sensitivity and availability.
  • * Carrier phase measurements offer high precision but are susceptible to tracking challenges and atmospheric effects.
  • * Real-Time Kinematic (RTK) applications demand robust and sensitive GNSS receivers for reliable positioning.

Purpose of the Study:

  • * To introduce and evaluate a novel double-differential vector phase-locked loop (DD-VPLL) for GNSS receivers.
  • * To enhance receiver sensitivity and improve the probability of ambiguity resolution compared to existing methods.
  • * To simplify the navigation filter by reducing the number of estimated states.

Main Methods:

  • * Development of a DD-VPLL that utilizes carrier phase position solutions and base station measurements.
  • * Estimation of rover tracking loop parameters using vector processing techniques.
  • * Implementation of double differencing to mitigate the need for estimating receiver clock dynamics and atmospheric delays.

Main Results:

  • * The DD-VPLL demonstrated significant receiver sensitivity improvements: 8–10 dB over STL and 7–8 dB over VFLL.
  • * Vector processing for carrier phase tracking led to enhanced performance.
  • * The proposed method resulted in an increased probability of ambiguity resolution, boosting availability for RTK.

Conclusions:

  • * The DD-VPLL offers a substantial advancement in GNSS receiver performance, particularly for carrier phase tracking.
  • * The enhanced sensitivity and improved ambiguity resolution make DD-VPLL highly suitable for demanding RTK applications.
  • * The simplified navigation filter design contributes to a more efficient and robust positioning solution.