GPS Swept Anti-Jamming Technique Based on Fast Orthogonal Search (FOS).

Area of Science:

• Navigation Systems
• Signal Processing
• Electromagnetic Interference

Background:

• Global Positioning System (GPS) receivers are increasingly vital for numerous applications.
• GPS signals are susceptible to jamming due to their low power, operating below the noise floor.
• Jamming degrades the Signal-to-Noise Ratio (SNR), disrupting essential GPS-based services.

Purpose of the Study:

• To propose a reliable and accurate swept anti-jamming technique for GPS receivers.
• To efficiently suppress GPS swept jamming signals using high-resolution spectral analysis.
• To ensure continuous and accurate positioning during jamming events.

Main Methods:

• Utilized Frequency Offset Spectrum (FOS) method for accurate spectral estimation of jamming signals.
• Implemented a swept anti-jamming technique integrated into GPS receiver signal processing.
• Conducted experiments using the Spirent GSS6700 simulation system for controlled validation.

Main Results:

• The proposed method successfully detected, estimated, and suppressed GPS swept jamming signals.
• The anti-jamming module enabled continuous positioning solutions during jamming.
• Achieved a positioning accuracy of within 10 meters despite jamming interference.

Conclusions:

• The developed swept anti-jamming technique offers an effective solution for GPS signal interference.
• High-resolution spectral analysis, specifically FOS, is crucial for accurate jamming signal estimation.
• The research validates the capability of the proposed method to maintain reliable GPS positioning under jamming conditions.