In complex electromagnetic environments, conventional GNSS-based navigation systems are increasingly vulnerable to signal degradation, intermittent loss, or complete denial. Intentional or unintentional interference, jamming, and multipath effects can severely impact positioning and attitude accuracy.
To address these challenges, integrated anti-jamming GNSS/INS navigation systems have become a critical engineering solution, enabling continuous and reliable navigation and attitude outputs even under harsh interference conditions.
1. Application Background
In high-interference operational scenarios, navigation systems are typically required to continuously provide:
These systems are often deployed on mobile platforms such as UAVs, autonomous vehicles, maritime platforms, and defense systems, where strict SWaP constraints (Size, Weight, and Power) apply.
As a result, the navigation solution must not only be accurate, but also:
2. Anti-Jamming as a System-Level Engineering Challenge
From an engineering perspective, anti-jamming performance cannot be achieved by the RF front-end alone.
While anti-jamming GNSS antennas play a vital role in spatial filtering and interference suppression, navigation continuity ultimately depends on system-level co-design, including:
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GNSS receiver architecture
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Inertial sensor performance
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Sensor fusion algorithms
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Coupling strategy between GNSS and INS
A practical integrated anti-jamming navigation solution typically includes:
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Multi-channel anti-jamming GNSS receiver
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Anti-jamming antenna for front-end interference mitigation
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High-performance INS (gyroscopes and accelerometers)
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Tightly coupled or deeply coupled GNSS/INS architecture
Only through coordinated system integration can stable navigation performance be maintained under severe interference.
3. Value of GNSS/INS Integration in Interference Environments
When GNSS signals are degraded, blocked, or temporarily unavailable, the Inertial Navigation System (INS) provides short-term navigation continuity based on inertial measurements.
Once GNSS signal quality recovers, GNSS observations are reintroduced into the navigation filter to correct inertial drift.
Through multi-sensor fusion, an integrated GNSS/INS system can:
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Maintain continuity of the navigation solution
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Preserve stable and smooth attitude outputs
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Reduce the impact of GNSS outages and interference
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Significantly improve overall system robustness
This complementary behavior makes GNSS/INS integration essential for high-reliability navigation applications.
4. Importance of Integrated System Design
Modern navigation platforms face increasing pressure to balance performance with SWaP constraints. As a result, integrated anti-jamming navigation systems must achieve:
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High-level integration of antenna, GNSS receiver, and INS
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Optimized trade-offs between miniaturization, power consumption, and accuracy
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Coordinated optimization of anti-jamming capability and navigation performance
Such systems are no longer simple assemblies of independent components. Instead, they represent application-driven, system-level engineering solutions designed to meet specific operational requirements.
5. Engineering Summary
As operational electromagnetic environments continue to grow more complex, GNSS can no longer be treated as a standalone navigation source.
Instead, it functions as one component within a deeply integrated GNSS/INS navigation architecture, where inertial sensing, anti-jamming techniques, and advanced sensor fusion algorithms work together.
Integrated anti-jamming GNSS/INS navigation systems are emerging as a key technical approach for delivering reliable positioning, velocity, and attitude information in high-interference environments—supporting mission-critical applications across aerospace, defense, unmanned systems, and advanced industrial platforms.
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