Digital Compensation for Synthetic Aperture Radar Parameter Changes

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Solution Overview

Problem

Existing synthetic aperture imaging systems face challenges in compensating for parameter changes, such as altitude variations, which require physical adjustments of optical components, reducing the system's sturdiness and viability.

Innovation Solution

A method and system for digitally compensating for parameter changes in synthetic aperture imaging systems by applying scaling factors and phase corrections to the SAR raw data, using equations and empirical databases to determine and apply scaling vectors and phase factors, allowing for parameter variations like Doppler shifts and Fresnel zone plate focal length changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If optical components are physically adjusted to compensate for parameter changes, then the compensation accuracy is improved, but the system sturdiness and viability deteriorate

Engineering Contradiction:

Improvecompensation accuracyVSAvoidsystem sturdiness

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent replaces the mechanical/optical adjustment system with a digital signal processing system. Instead of physically moving optical components to compensate for parameter changes, the invention applies digital corrections to the SAR raw data to achieve the same compensation effect, thereby eliminating mechanical complexity and improving system reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the approach from physical parameter adjustment to digital parameter correction. By modifying the digital representation of the radar data through scaling and phase corrections, the system achieves compensation without physical adjustments, resolving the contradiction between accuracy and sturdiness

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If optical components are moved to compensate for parameter changes, then the imaging accuracy is improved, but the processing complexity and device complexity increase

Engineering Contradiction:

Improveimaging accuracyVSAvoidprocessing complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent substitutes complex optical-mechanical adjustment mechanisms with straightforward digital signal processing operations. The scaling and phase correction algorithms are computationally simpler and more easily implemented than precise optical component positioning systems

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent works with digital copies of the radar data rather than physical optical paths. By applying corrections to the digital representation of the signal, the system achieves imaging accuracy without the complexity of manipulating physical optical components

Inventive Principle:

Principle #26Copying

Data Source

PatentEP2585849B1Method and apparatus for compensating for a parameter change in a synthetic aperture imaging system

Publication Date: 2019.03.20 INSTITUT NATIONAL D'OPTIQUE

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AI summary

There is described a method for processing data generated by a synthetic aperture imaging system, comprising: receiving raw data representative of electromagnetic signals reflected by a target area to be imaged; receiving a parameter change for the synthetic aperture imaging system; digitally correcting the raw data in accordance with the parameter change, thereby compensating for the parameter change in order to obtain corrected data; and generating an image of the target area using the corrected data.