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Wide-Band Interference Mitigation in GNSS Receivers Using Sub-Band Automatic Gain Control.

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Summary
This summary is machine-generated.

A new HDDM-AGC method improves Global Navigation Satellite System (GNSS) receiver performance against interference. This technique enhances position, velocity, and time (PVT) accuracy and availability, especially for low-cost receivers facing wide-band noise.

Keywords:
automatic gain control (AGC)global navigation satellite system (GNSS)high-rate DFT-based data manipulator (HDDM)interference mitigation (IM)sub-band processing

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Area of Science:

  • Signal Processing
  • Navigation Systems
  • Electromagnetics

Background:

  • Global Navigation Satellite System (GNSS) receiver performance is degraded by interference signals.
  • Existing interference mitigation (IM) methods like the high-rate DFT-based data manipulator (HDDM) pulse blanker (PB) struggle with wide-band noise signals.
  • Previous analyses focused on carrier-to-noise density ratio (C/N0), neglecting the impact on the overall navigation solution.

Purpose of the Study:

  • To introduce and evaluate the HDDM-AGC algorithm for GNSS interference mitigation.
  • To assess the impact of HDDM-AGC on the position, velocity, and time (PVT) solution, enabling end-to-end evaluation.
  • To compare the performance of HDDM-AGC against existing methods on both high-end and low-cost GNSS receivers.

Main Methods:

  • Integration of automatic gain control (AGC) into the HDDM structure to create HDDM-AGC.
  • Analysis of HDDM-AGC's effect on GNSS receiver PVT solution performance.
  • Experimental comparison of two commercial receivers (high-end and low-cost) with and without HDDM-AGC against laboratory-generated interference signals.

Main Results:

  • HDDM-AGC provides PVT availability and precision comparable to high-end receivers for most interference types, outperforming them for pulsed interference.
  • The algorithm minimizes performance degradation against wide-band noise signals.
  • For low-cost receivers, HDDM-AGC application increased PVT availability by up to 40%.

Conclusions:

  • HDDM-AGC effectively mitigates a wider range of interference signals compared to traditional HDDM.
  • The algorithm offers a cost-effective solution for enhancing GNSS receiver performance, particularly for low-cost devices.
  • This study provides a comprehensive evaluation of IM techniques on GNSS PVT solutions.