Virtual Transponder Ionospheric Coordinate Registration
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Solution Overview
Problem
Conventional over-the-horizon radar (OTHR) systems face limitations in range due to ionospheric variability and require significant changes in radar systems to implement advanced ionospheric models, which are costly and resource-intensive, especially when accessing remote areas or lacking spatial homogeneity.
Innovation Solution
A method utilizing a virtual transponder with an ionospheric model for ray tracing to generate propagation parameters, allowing for coordinate registration with minimal changes to existing systems, employing analytic ray tracing techniques for real-time processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If assimilative ionospheric models are integrated into existing OTHR radar systems, then coordinate registration accuracy is improved, but system complexity and implementation cost increase significantly
Solution Approach 1:
The patent creates a virtual transponder that generates simulated return signals based on ionospheric model parameters, copying the function of a physical transponder without requiring actual deployment. This virtual transponder is processed through the existing radar signal processing chain, providing coordinate registration data without modifying the radar hardware or software architecture.
Solution Approach 2:
The virtual transponder acts as an intermediary between the ionospheric model and the radar coordinate registration system. It translates complex ionospheric parameters into simulated transponder return signals that the existing radar system can process using its standard signal processing algorithms, bridging the gap between advanced modeling and legacy systems.
2Measurement precision
If physical transponders are deployed at remote target locations for coordinate registration, then registration accuracy is improved, but access to remote areas becomes necessary and radar resources are strained
Solution Approach 1:
Instead of deploying physical transponders at remote locations, the system creates virtual transponders that simulate their function through software. These virtual transponders generate return signals based on calculated ionospheric propagation parameters, eliminating the need for physical deployment in inaccessible areas while maintaining registration accuracy.
Solution Approach 2:
The system uses its own transmitted signals and ionospheric modeling capabilities to generate virtual transponder returns, making the system self-sufficient. No external transponders or additional equipment at remote locations are needed—the radar system creates its own reference signals through virtual transponder simulation.
3Measurement precision
If numerical ray tracing techniques are used for real-time coordinate registration, then accuracy is improved, but computational time increases making real-time processing difficult
Solution Approach 1:
The system pre-calculates ionospheric propagation parameters using numerical ray tracing during periods when real-time processing is not required. These pre-computed parameters are then used by the virtual transponder to generate return signals in real-time, separating the computationally intensive calculations from the time-critical signal generation.
Solution Approach 2:
The coordinate registration process is divided into two segments: an offline phase where numerical ray tracing is performed to establish accurate ionospheric models, and an online phase where virtual transponders use these pre-established models to generate real-time return signals. This segmentation allows high-accuracy calculations to be performed when computational resources are available while maintaining real-time performance when needed.
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
Enables accurate coordinate registration with reduced computational burden and minimal system modifications, effectively extending OTHR capabilities without the need for extensive upgrades or resource strain.
Implementation Method 1
The operation of OTHR systems relies on ionospheric reflection of certain radio waves. Transmitted waves can be reflected or backscattered from the ionosphere, and the reflection from the target likewise reflected back to the receiver.
Implementation Method 2
ray tracing through said model from the radar transmitter to said virtual transponder and back to a receiver to produce propagation parameters
Data Source
AI summary
Integration of ionospheric models in over the horizon radars (OTHR) is achieved with very little or substantially no change to existing coordinate registration systems or software by specifying a virtual transponder at a target location and generating a signal which appears to have emanated from a transponder at that location. A return path to said virtual transponder is ray-traced through the ionospheric model to produce propagation parameters; and an appropriately delayed virtual transponder signal is inserted into the receiver. The result produced at the receiver is used to perform coordinate registration for further received signals.