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Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
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GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
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The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
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A Spatial-Temporal Approach Based on Antenna Array for GNSS Anti-Spoofing.

Yuqing Zhao1, Feng Shen1, Guanghui Xu2

  • 1School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.

Sensors (Basel, Switzerland)
|February 12, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel spatial-temporal technique for Global Navigation Satellite System (GNSS) receivers to detect and suppress spoofing signals. The method enhances positioning accuracy by distinguishing and mitigating spoofing, even at low power levels.

Keywords:
antenna arraycross-correlation monitoringeigen spaceglobal navigation satellite system (GNSS)oblique projectionpower comparisonspoofing detection

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Area of Science:

  • Signal Processing
  • Navigation Systems
  • Antenna Array Signal Processing

Background:

  • Spoofing signals threaten Global Navigation Satellite System (GNSS) applications, potentially causing positioning service malfunctions.
  • Reliable detection and suppression of spoofing are critical for secure GNSS-based positioning.

Purpose of the Study:

  • To present a spatial-temporal technique for GNSS receivers to reliably detect and suppress spoofing signals.
  • To enhance the robustness of GNSS positioning against malicious interference.

Main Methods:

  • A two-stage technique based on antenna arrays for Direction of Arrival (DOA) estimation and power estimation.
  • Signal preprocessing to address signal model mismatch in DOA estimation.
  • Spoofing detection via power comparison and cross-correlation monitoring.
  • Signal enhancement using beamforming and spoofing suppression via subspace oblique projection.

Main Results:

  • The technique effectively detects and suppresses spoofing signals, including low-power attacks and multipath interference.
  • It distinguishes between spoofing and genuine signals.
  • Estimated DOA and power aid in subsequent spoofing localization.
  • Simulation results validate the method's effectiveness.

Conclusions:

  • The proposed spatial-temporal technique offers a robust solution for GNSS spoofing detection and suppression.
  • It can be implemented on raw digital baseband signals without external hardware.
  • The method improves the reliability and security of GNSS positioning applications.