Omnidirectional EM Source Mapping With Local Feature Projection
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Solution Overview
Problem
Existing methods fail to effectively project and estimate electromagnetic wave distributions in omnidirections on the earth and in outer space onto an entire celestial sphere surface or ground surface, leading to high measurement times and data amounts, making on-board processing difficult.
Innovation Solution
An electromagnetic wave information processing device and method that calculates local and entire omnidirectional features using a spacecraft coordinate system, projecting measurement and estimation information onto an entire celestial sphere surface or ground surface, utilizing a measurement unit, calculation unit, and output unit to generate a distribution map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If projection and estimation are performed in the omnidirection to map entire celestial sphere surface, then measurement completeness is improved, but measurement time and data amount become enormous
Solution Approach 1:
The patent divides the omnidirectional measurement space into multiple local fields of view, each observed by a separate antenna. Instead of attempting to measure the entire celestial sphere simultaneously with one system, the measurement task is segmented across multiple antennas, each handling a portion of the sky. This segmentation allows parallel measurement without requiring enormous measurement time for a single omnidirectional scan.
Solution Approach 2:
The patent transforms the measurement problem from a two-dimensional celestial sphere mapping task into a three-dimensional solution by utilizing the spatial distribution of multiple antennas in formation flight. The antennas are positioned at different locations and orientations, allowing simultaneous observation of different sky regions. This dimensional approach converts a time-consuming sequential scan into a parallel spatial measurement system.
2Measurement precision
If projection and estimation are performed in the omnidirection to map entire celestial sphere surface, then measurement completeness is improved, but data amount becomes enormous making on-board processing difficult
Solution Approach 1:
The patent extracts and utilizes the geometric relationship information between multiple antennas in formation flight to simplify the processing task. Instead of processing enormous amounts of raw omnidirectional data, the system extracts essential spatial configuration data of the antenna array and uses this extracted geometric information to reconstruct the electromagnetic wave source distribution. This extraction approach reduces on-board processing complexity while maintaining measurement completeness.
Solution Approach 2:
The patent performs preliminary calculation of the geometric relationship between antennas and the celestial sphere coordinate system before the actual electromagnetic wave measurement. By pre-computing the transformation relationships and spatial configurations, the system prepares processing templates in advance, which significantly reduces the computational burden during real-time omnidirectional measurement and mapping operations.
3Productivity
If local omnidirectional feature information is used to estimate entire celestial sphere surface, then processing efficiency is improved, but estimation accuracy may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where the estimated electromagnetic wave source distribution on the entire celestial sphere is continuously refined using actual measurement data from multiple antennas. The system compares the estimated results with the actual omnidirectional measurements and uses this feedback to correct and improve the estimation accuracy, ensuring that processing efficiency gains do not compromise measurement precision.
Solution Approach 2:
The patent merges multiple local omnidirectional feature information from antennas at different positions and orientations to reconstruct the entire celestial sphere surface. By combining the partial observations from multiple antennas through coherent integration and coordinate transformation, the system achieves complete sky coverage with high estimation accuracy, leveraging the complementary information from each antenna's local field of view.
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 effective and low-cost projection and estimation of electromagnetic wave distributions in omnidirections onto entire celestial and ground surfaces, allowing for quick data estimation and reduced on-board processing requirements.
Implementation Method 1
An electromagnetic wave arrival direction determining method by observing a phase difference or the like in interferometry processing using signals received by a plurality of antennas has been proposed.
Implementation Method 2
An electromagnetic wave arrival direction determining method by observing a phase difference or the like in interferometry processing
Data Source
AI summary
An electromagnetic wave information processing device includes an input unit configured to receive a measurement result that measures electromagnetic waves incident on a spacecraft from substantially an omnidirection. A calculation is performed based on information received by the input unit; and an output unit is configured to output a calculation result. The calculation is based on the measurement result received by the input unit, a local omnidirectional feature which is a coefficient of a local basis function indicating a distribution of the electromagnetic waves received by the input unit in a spacecraft coordinate system centered on the spacecraft at a predetermined position in an outer space, and an entire omnidirectional feature which is a coefficient of an entire basis function based on local omnidirectional features and the predetermined positions, thereby generating a map indicating a distribution of an entire electromagnetic wave source including a ground surface and the outer space.