Phased-Array GNSS Anti-Jamming Across Multiple Frequency Bands
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Solution Overview
Problem
Global navigation satellite systems (GNSS) are vulnerable to jamming signals that interfere with position calculations, disrupting accurate determination of vehicle locations, and existing technologies struggle to effectively mitigate such interference across multiple frequency bands.
Innovation Solution
A phased-array anti-jamming device comprising multiple antennas, splitters, digital signal processors, phase shifters, and combiners, which utilize null-steering algorithms to electronically steer RF radiation and direct jamming signals away from the receiver, reducing jammer power by at least 30 dB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-antenna GNSS receivers are used, then the device complexity is low, but the system becomes vulnerable to jamming signals and cannot effectively mitigate interference
Solution Approach 1:
The system divides the signal processing into multiple parallel paths: a digital processing channel for narrowband jamming and multiple analog processing channels for wideband jamming. Each channel is optimized for specific frequency ranges, allowing the system to handle different types of jamming threats independently while maintaining overall system reliability.
Solution Approach 2:
The patent transitions from traditional single-antenna reception to a phased array antenna system with multiple elements. This spatial dimension enables the system to form directional beams and nulls, providing spatial filtering capability that significantly enhances anti-jamming performance by selectively rejecting signals from specific directions.
2Reliability
If analog processing channels are used for wideband jamming, then the anti-jamming effectiveness improves, but the device complexity and power consumption increase
Solution Approach 1:
The system implements a hybrid architecture where only critical frequency bands requiring wideband processing are routed through analog channels, while other bands are handled by more energy-efficient digital processing. This partial application of analog processing minimizes power consumption while maintaining effectiveness against wideband jamming threats.
3Adaptability or versatility
If multiple frequency bands are processed simultaneously, then the versatility and anti-jamming coverage improve, but the device complexity increases
Solution Approach 1:
The phased array antenna system serves multiple functions simultaneously: it performs spatial filtering for jamming rejection, enables multi-frequency band processing, and provides beam forming capabilities. This universal platform handles various GNSS frequencies (L1, L2, L5) and different jamming scenarios through a single integrated architecture, improving versatility without proportionally increasing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively protects GNSS systems from jamming by reducing interference across multiple frequency bands, ensuring accurate location determination and maintaining low power consumption, making it suitable for various applications including vehicular tracking and navigation systems.
Implementation Method 1
utilize null-steering algorithms to electronically steer RF radiation and direct jamming signals away from the receiver, reducing jammer power by at least 30 dB
Data Source
AI summary
A phased array anti-jamming device, comprising a plurality (N) of antennas and a plurality of splitters connected to the antennas and adapted to split an RF stream received from the antennas. The phased array anti-jamming device further includes at least one digital signal processor adapted to digitally analyze a digital output of digital processing channels and to split the output into a plurality of digital down converted representations of respective analog outputs of a plurality of analog digital processing channels in a plurality of different frequencies and calculate at least one instructions selected from phase shift, amplification, and attenuation instructions for each one of the plurality of antennas per each one of the plurality of different frequencies. The phased array anti-jamming device further includes a plurality of phase shifter groups a plurality of group combiners and a main combiner adapted to sum outputs of the plurality of group combiners.