Radio Wave Condition Output Device for 3D Direction Estimation
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Solution Overview
Problem
Existing methods for estimating the arrival direction of radio waves are limited to two-dimensional horizontal planes and do not account for radio waves arriving from vertical directions due to phenomena like diffraction and reflection.
Innovation Solution
A radio wave status output device and method that utilize a directional antenna to measure reception power or C/N values at multiple points on a horizontal plane, calculate an approximate curved surface representing these values in three dimensions, and extract regions on a two-dimensional plane where the reception power or C/N values exceed a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If planar direction of arrival estimation is used based on correlation matrix from array antenna, then the estimation process is simple and based on horizontal plane only, but it cannot estimate radio waves arriving from vertical directions
Solution Approach 1:
The invention transitions from two-dimensional horizontal plane estimation to three-dimensional estimation by adding elevation angle measurement capability. The directional antenna is moved to multiple positions on a vertical plane and rotated to scan different directions, enabling measurement of both azimuth and elevation angles to capture radio waves from all directions including vertical paths caused by diffraction and reflection.
2Measurement precision
If directional antenna measures reception power at multiple positions and directions, then three-dimensional radio wave status can be captured, but the measurement process becomes complex and time-consuming
Solution Approach 1:
The invention performs preliminary actions by pre-defining measurement positions on a vertical plane and pre-setting rotation angles for the directional antenna. The system automatically moves the antenna to predetermined positions and rotates it to predetermined angles according to a measurement program, eliminating the need for manual positioning and angle setting during actual measurements, thus reducing measurement time while maintaining comprehensive three-dimensional coverage.
3Loss of information
If comprehensive three-dimensional measurement is performed, then accurate radio wave status is obtained, but data processing and visualization become complex
Solution Approach 1:
The invention extracts essential three-dimensional radio wave status information by measuring reception power or C/N values at specific measurement positions and directions, then processes this extracted data to generate visual representations. The system focuses on capturing key parameters (reception power, C/N value, azimuth angle, elevation angle) rather than attempting to process all possible measurement data, simplifying the data processing while maintaining comprehensive information about radio wave propagation paths including reflected and diffracted waves.
Data Source
AI summary
A radio wave status output device has: a measurement circuitry that measure each reception power or a C/N value of a radio wave received; an angle measurement circuitry that measure each an azimuth angle and an elevation angle of the directional antenna; a calculation circuitry that calculate an approximate curved surface corresponding to each the reception power or C/N value at a position of each of the plurality of different points on an X-Y plane, respectively, and that the reception power or the C/N value measured is a value of a Z-axis; and an extraction circuitry that extract, from the approximate curved surface calculated, a range on the X-Y plane in which the value of the Z-axis is equal to or greater than a predetermined threshold.