Beam Information Generating Device for Bistatic Radar Precision
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Solution Overview
Problem
Bistatic weather radars face challenges in achieving high precision due to large deviations in the volumes where transmission and reception beams intersect, leading to uneven statistical properties and reduced observation precision.
Innovation Solution
A beam information generating device that calculates distances and beam widths of reception beams to restrain variations in the volumes enclosed by transmission and reception beams, allowing for precise observation by dividing the observed area into subareas with uniformly sized cross-sections and adjusting beam widths based on calculated distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multi-reception beam is used to enhance reception gain and spatial resolution, then the reception performance is improved, but the number of reception beams increases and the device scale becomes problematic
Solution Approach 1:
The patent combines multiple reception beams into a single wide-angle beam for signal reception. The beam information generating unit generates beam information including a reception beam direction that synthesizes multiple reception beam directions, and a reception beam width that covers the entire transmission beam area. This merging approach maintains the reception performance benefits while reducing the number of beams to one, thereby simplifying the device scale.
Solution Approach 2:
The single wide-angle reception beam is designed to perform multiple functions: it covers the entire transmission beam area, provides sufficient reception gain, and maintains spatial resolution through proper beam width control. This universal beam design eliminates the need for multiple specialized reception beams while achieving the same overall performance.
2Device complexity
If beam widths are widened to reduce the number of reception beams, then the device scale is reduced, but large deviations in observed volumes cause variations in observation precision
Solution Approach 1:
The patent applies local quality by making the beam width adaptive to the local geometry of the transmission beam. The beam width is calculated based on the distance from the receiver to the transmission beam and the transmission beam width, ensuring that the reception beam maintains a consistent enclosed volume with the transmission beam across different spatial locations. This local adaptation prevents large deviations in observed volumes while using a single wide-angle beam.
Solution Approach 2:
The patent changes the beam width parameter dynamically based on the distance to the transmission beam. The beam information generating unit calculates the reception beam width using the relationship between transmission beam width, distance, and desired enclosed volume, thereby maintaining observation precision while using fewer beams.
3Device complexity
If a wide-angle beam is used instead of multi-reception beams, then the device scale is reduced, but the reception gain and spatial resolution are insufficient
Solution Approach 1:
The patent introduces dynamics by making the reception beam parameters (direction and width) adaptive rather than fixed. The beam information generating unit dynamically calculates the optimal reception beam width and direction based on the transmission beam characteristics and receiver position, allowing the single wide-angle beam to achieve reception gain comparable to multiple narrow beams while maintaining simplified device architecture.
Data Source
AI summary
According to one embodiment, there is provided a beam information generating device including: a distance calculator that calculates distances, from a receiver, along a plurality of reception beams formed by the receiver to a transmission beam, based on transmission beam information; and a beam width calculator that calculates beam widths of the reception beams based on the distances calculated by the distance calculator so as to restrain variations in volume enclosed by the transmission beam and the reception beams.