Angle Measuring Device Multipath Error Reduction
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Solution Overview
Problem
Conventional angle measuring devices fail to account for multipath effects, leading to significant deterioration in measurement accuracy.
Innovation Solution
The angle measuring device employs a processor to select phase differences with reduced variance, compute the azimuth angle from the ratio of specific phase differences, and determine the elevation angle, thereby mitigating the impact of multipath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional angle measuring devices use signals received by a plurality of antennas to determine azimuth angle based on phase difference, then the device can measure arrival angle, but measurement accuracy greatly deteriorates due to multipath effects
Solution Approach 1:
The patent changes the parameter of antenna spacing from uniform spacing to non-uniform spacing, specifically setting the distance between adjacent antenna elements in the vertical direction to be different from the distance between adjacent antenna elements in the horizontal direction. This parameter change makes the phase difference less sensitive to multipath effects, thereby improving measurement accuracy
Solution Approach 2:
The patent pre-calculates and stores a correspondence relationship between phase differences and arrival angles in a lookup table before actual measurement. This preliminary action allows the system to quickly retrieve accurate angle information without real-time complex calculations, improving both speed and accuracy while reducing the impact of multipath effects
Data Source
AI summary
An angle measuring device includes an antenna device having antenna elements equally spaced along a first axis and a second axis, respectively, a selecting unit that selects phase differences with which a variance thereof becomes a predetermined value or less, from a plurality of phase differences of signals received from a transmission device by the antenna elements, an azimuth angle computing unit that computes an azimuth angle of the transmission device from a ratio of a first phase difference between signals received by two antenna elements spaced by a predetermined distance along the first axis and a second phase difference between signals received by two antenna elements space by the predetermined distance along the second axis, and an elevation angle computing unit that computes an elevation angle of the transmission device, based on the computed azimuth angle and the first or second phase difference.