Active Sensor Calibration via Virtual Reference Targets

The patent uses software-based virtual reference targets that replicate the backscattering behavior of physical reference targets through computational models. Instead of manufacturing expensive physical targets with precise backscattering properties, the invention creates digital copies that simulate the same electromagnetic scattering characteristics, thereby eliminating manufacturing complexity while maintaining calibration accuracy.

The patent replaces the mechanical/physical reference target system with a computational/electronic system. Virtual reference targets are implemented through software algorithms that calculate backscattering behavior based on known object geometries and electromagnetic properties, substituting physical manufacturing with digital computation to achieve the same calibration function.

The patent creates virtual replicas of reference targets with precisely defined geometric and electromagnetic properties in the digital domain. These virtual targets eliminate the manufacturing tolerances inherent in physical targets, as their properties can be defined with arbitrary precision through computational models, thereby reducing measurement uncertainty while maintaining calibration reliability.

The patent transitions from fixed physical parameters of manufactured targets to programmable digital parameters. The backscattering characteristics are controlled by software parameters rather than physical manufacturing tolerances, allowing for precise control and adjustment of target properties without the limitations of physical fabrication, thus reducing measurement uncertainty.

The patent replaces specialized radiometric standards with virtual reference targets that are implemented through software. These virtual targets contain embedded knowledge of backscattering behavior and can be distributed digitally without requiring specialized physical artifacts or complex radiometric calibration equipment, thereby reducing system complexity while maintaining absolute calibration accuracy.

The patent introduces virtual reference targets as an intermediary between the sensor system and the calibration process. Instead of requiring direct comparison with expensive physical radiometric standards, the virtual targets serve as a computational mediator that provides the necessary calibration reference through software-based electromagnetic scattering calculations, simplifying the overall system architecture.