Direction Detection Device Using Non-Uniform Radome Intensity Differences
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Solution Overview
Problem
Conventional direction detection devices face ambiguity issues when detecting received-wave arrival directions due to spatial restrictions in radome installations, limiting the ability to calculate three-dimensional directions using phase differences between antennas.
Innovation Solution
A direction detection device that imparts intensity differences to received waves using a radome with a non-uniform shape, storing an intensity difference table associating these differences with arrival directions, and using a detector, extractor, and comparator to determine the matched arrival direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antennas are arrayed in two-dimensional manner to eliminate ambiguity and detect three-dimensional arrival direction, then measurement precision is improved, but device complexity and installation difficulty increase due to spatial restrictions in radome
Solution Approach 1:
The patent introduces a radome with non-uniform thickness as an intermediary element that imparts intensity differences to received waves. This radome acts as a mediator between the limited one-dimensional antenna arrangement and the desired three-dimensional direction detection capability, enabling the system to achieve 3D detection without requiring complex two-dimensional antenna array configurations
Solution Approach 2:
The patent changes the physical parameter of the radome from uniform to non-uniform thickness distribution. This parameter change creates direction-dependent intensity differences that, when combined with phase difference measurements from the antenna array, enable unambiguous three-dimensional arrival direction detection while maintaining a simple one-dimensional antenna configuration
2Device complexity
If antennas are lined up in one direction only due to spatial restrictions, then device complexity is reduced, but measurement precision deteriorates as three-dimensional arrival direction cannot be calculated
Solution Approach 1:
The non-uniform radome serves as an intermediary that compensates for the limited one-dimensional antenna arrangement. By introducing intensity differences based on arrival direction through its non-uniform structure, it enables the simple linear antenna configuration to achieve three-dimensional direction detection capability that would otherwise require complex two-dimensional arrays
Solution Approach 2:
The patent employs asymmetric (non-uniform) radome thickness distribution to create direction-dependent intensity variations. This asymmetry in the radome structure allows the system to distinguish between different spatial directions using only a one-dimensional antenna array, converting the structural limitation into a functional advantage
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 accurate detection of received-wave arrival directions in three dimensions, even with restricted antenna arrangements, by eliminating ambiguity through intensity difference analysis.
Implementation Method 1
an intensity difference imparting unit that imparts intensity differences different depending on the received-wave arrival direction to intensities of the received wave to be received at the antennas
Data Source
AI summary
A direction detection device for detecting a received-wave arrival direction of a received wave, and includes: antennas for receiving the received wave; an intensity difference imparting unit that imparts intensity differences different depending on the received-wave arrival direction to intensities of the received wave; a storage unit that stores an intensity difference table in which the intensity difference between two of the antennas is associated with the received-wave arrival direction, for each combination of any two of the antennas; a detector that detects the intensity difference between the two antennas of the received wave; an extractor that extracts, from the intensity difference table, received-wave arrival directions corresponding to the intensity difference detected by the detector, for each combination; and a comparator that compares the received-wave arrival directions extracted by the extractor between the combinations of the antennas to acquire a matched received-wave arrival direction as a detection result.