RF Orthogonal Interferometry for Jamming-Resistant Projectile Guidance
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Solution Overview
Problem
Conventional projectile guidance systems are vulnerable to GPS jamming and spoofing, especially in GPS-denied or GPS-limited environments, and pseudolite deployments are risky and susceptible to jamming due to their reliance on GPS-like transmissions.
Innovation Solution
A navigation method using a local domain Radio Frequency (RF) orthogonal interferometry system that provides GPS-like performance while being resistant to jamming, employing an RF illuminator and receiver to determine azimuth, elevation, and range for guiding projectiles or UAVs, allowing for deployment away from the engagement area and enabling controlled detonation or targeting in GPS-denied environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS navigation is used for guiding projectiles, then navigation accuracy is improved, but the system becomes vulnerable to jamming and spoofing
Solution Approach 1:
The patent introduces an RF orthogonal interferometry system as an intermediary between the projectile and GPS satellites. This ground-based RF system creates a localized reference frame that mediates the navigation function, allowing the projectile to determine its position and orientation without directly relying on GPS signals, thereby achieving GPS-like accuracy while resisting jamming and spoofing
Solution Approach 2:
The patent replaces the satellite-based electromagnetic navigation system (GPS) with a ground-based RF interferometry system. This substitution uses locally generated RF signals and orthogonal interferometry measurements to determine projectile position and orientation, eliminating vulnerability to GPS jamming while maintaining navigation precision
2Adaptability or versatility
If pseudolites are deployed to extend GPS coverage, then navigation capability is improved, but the system becomes susceptible to jamming and requires complex deployment
Solution Approach 1:
The patent extracts the navigation reference function from the GPS satellite system and implements it through a ground-based RF orthogonal interferometry system. By taking out the reference frame generation capability from space and placing it on the ground, the system achieves localized GPS-like coverage without requiring pseudolite deployment, thereby reducing complexity while maintaining adaptability
Solution Approach 2:
The RF orthogonal interferometry system serves multiple functions: it provides navigation reference, enables jamming-resistant communication, and creates a localized GPS-like environment without requiring additional infrastructure. This multi-functionality replaces the need for separate pseudolite systems, reducing overall deployment complexity
3Adaptability or versatility
If pseudolites are placed in hostile regions, then navigation support is improved, but the risk to installers increases
Solution Approach 1:
The patent uses the RF orthogonal interferometry system as an intermediary that can be deployed in safer locations while still providing navigation support to projectiles in hostile regions. The ground-based RF system creates a reference frame that extends coverage without requiring physical presence in dangerous areas, thereby eliminating risk to installers while maintaining navigation capability
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 RF orthogonal interferometry system offers accurate guidance with minimal likelihood of being jammed or spoofed, achieving precision comparable to GPS systems with reduced complexity and cost, and allows for deployment in hostile regions without exposing the guidance system to direct enemy targeting.
Implementation Method 1
radio frequency orthogonal interferometry array providing a reference frame, via a projected grid, in the direction of the at least one target; the reference frame providing azimuth and elevation information
Data Source
AI summary
The system and method of projectile flight management using a combination of radio frequency orthogonal interferometry for the long range navigation and guidance of one or more projectiles that does not need to be accurate all the way to the ground based on the use of larger artillery. The system provides for more accurate targeting, especially in GPS-denied and GPS-limited environments.