ESPRIT Angle Measurement Reliability via Signal Estimation
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Solution Overview
Problem
Conventional ESPRIT angle measurement processing is adversely affected by differences in reception characteristics such as amplitude or phase between sensors, leading to errors in estimating the number of arriving signal waves and subsequent angle measurement results.
Innovation Solution
A signal wave arrival angle measuring device that estimates additional information like array response vectors and electric power, using an ESPRIT angle measurement processing section, and a reliability determination section to verify the correctness of angle measurement results based on these estimates, thereby excluding erroneous measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ESPRIT angle measurement processing is used to achieve high resolution angle measurement with small operation load, then measurement precision is improved, but reliability deteriorates due to sensor reception characteristic differences causing erroneous angle measurement results
Solution Approach 1:
The patent applies feedback by estimating the number of arriving signal waves and using this estimation to verify angle measurement results. The system feeds back the estimated signal wave count to the angle measurement processing, enabling it to identify and exclude erroneous results caused by sensor reception characteristic differences, thus improving reliability while maintaining measurement precision.
Solution Approach 2:
The patent performs preliminary estimation of the number of arriving signal waves before conducting angle measurement processing. This preliminary action allows the system to prepare appropriate processing parameters and verification criteria in advance, enabling it to handle sensor characteristic variations and exclude erroneous results effectively.
2Productivity
If the number of arriving signal waves is estimated to enable subsequent angle measurement processing, then productivity is improved, but measurement precision deteriorates when sensor reception characteristics differ, causing erroneous estimates
Solution Approach 1:
The system uses feedback by comparing the estimated number of signal waves with verification results from angle measurement processing. This feedback mechanism allows the system to identify erroneous estimates caused by sensor characteristic differences and correct them, maintaining both processing efficiency and estimation precision.
Solution Approach 2:
The angle measurement processing section performs self-verification by using the estimated signal wave count to check its own measurement results. This self-service mechanism enables the system to identify and exclude erroneous results, ensuring both efficient processing and accurate measurements even when sensor characteristics vary.
Data Source
AI summary
A signal wave arrival angle measuring device includes: an observation data vector generation section generating an observation data vector necessary for an angle measurement of a signal wave from an electrical signal having been converted at a sensor group converting the signal wave of an observation target to the electrical signal; an ESPRIT angle measurement processing section calculating an arrival angle of the signal wave from the generated observation data vector; an arriving signal wave estimation section estimating information other than the arrival angle of the arriving signal wave from an angle measurement processing process data of the ESPRIT angle measurement processing at the ESPRIT angle measurement processing section; and a reliability determination section determining whether or not an angle measurement result of the calculated arrival angle is correct based on an estimation result of the arriving signal wave estimation section, and excluding an erroneous angle measurement result.