Rotatable Microwave Radiometer for Polarization-Accurate Remote Sensing
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Solution Overview
Problem
Conventional remote sensing systems are limited by their fixed observational capabilities, are often bulky and power-intensive, difficult to calibrate, and can mix polarization axes during observation, which hampers accurate environmental data collection.
Innovation Solution
A system comprising a mobile body portion rotatably coupled with a fixed body portion, allowing the microwave radiometer to rotate about one or two axes for comprehensive environmental scanning, and an internal calibration method using external targets to maintain accurate calibration without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional remote sensing systems use fixed observational capabilities, then device complexity is reduced, but measurement precision and adaptability deteriorate
Solution Approach 1:
The patent applies dynamics by making the radiometer rotatable about one or two axes, transforming a fixed observational system into a dynamic scanning system. This allows the instrument to actively scan the environment and collect data from multiple angles, improving measurement precision without requiring multiple fixed instruments, thus managing device complexity effectively.
Solution Approach 2:
The patent divides the observational capability into multiple rotational segments, allowing the radiometer to scan different portions of the environment sequentially. This segmentation approach enables comprehensive environmental monitoring while using a single instrument, avoiding the complexity of deploying multiple fixed sensors.
2Measurement precision
If conventional remote sensing systems are bulky and power-intensive, then measurement capability is improved, but portability and operational cost worsen
Solution Approach 1:
The patent employs periodic action through the rotational scanning mechanism, where the radiometer periodically sweeps through different angular positions to collect environmental data. This periodic scanning allows the system to achieve comprehensive measurement capability with a single instrument operating at moderate power levels, rather than requiring multiple continuously operating high-power sensors.
3Measurement precision
If conventional remote sensing systems lack internal calibration, then device complexity is reduced, but measurement precision and reliability deteriorate
Solution Approach 1:
The patent implements self-service calibration through an internal calibration target that the radiometer can observe autonomously. The system automatically performs calibration by rotating to observe the internal target at specific angles, eliminating the need for external calibration equipment or manual intervention. This self-calibrating mechanism maintains high measurement precision while adding minimal complexity to the overall system.
Solution Approach 2:
The calibration system uses feedback by comparing the radiometer's observations of the internal calibration target against known reference values. This feedback loop allows the system to automatically adjust and maintain accurate measurements, ensuring reliability without requiring complex external calibration infrastructure.
4Measurement precision
If conventional remote sensing systems observe without polarization preservation, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent applies dynamics by rotating the entire radiometer assembly rather than using complex internal polarization-maintaining mechanisms. This dynamic approach preserves polarization integrity by maintaining the relative orientation between the radiometer's polarization-sensitive components and the incoming electromagnetic waves, achieving accurate polarization measurements without requiring additional polarization-control hardware.
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 continuous, cost-effective, and accurate environmental data collection across multiple bands of the electromagnetic spectrum with preserved polarization integrity, reducing operational costs and enhancing calibration efficiency.
Implementation Method 1
measuring the radiant flux of electromagnetic radiation received from the environment
Implementation Method 2
An antenna focuses the radiant flux of electromagnetic radiation into the receiver
Implementation Method 3
A receiver converts the incoming radiant flux into a signal, usually proportional to the input power
Data Source
AI summary
A system for passive microwave remote sensing using at least one microwave radiometer includes a fixed body portion, the fixed body portion being configured to attach to a mobile platform, and a mobile body portion, the mobile body portion being configured for rotatably coupling with the fixed body portion for rotation about a rotation axis. The mobile body portion is configured for supporting the at least one microwave radiometer therein such that the at least one microwave radiometer rotates about the rotation axis when the mobile body portion is rotated about the rotation axis such that a polarization axis of the at least one radiometer is aligned with an earth axis. The fixed body portion includes a motor mechanism for effecting rotation of the mobile body portion such that the at least one microwave radiometer provides a vertical scanning below and above the mobile platform.