Estimation method, estimation device, and program
US11630195B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2018 |
| Grant date | Apr 18, 2023 |
| Priority date | — |
| Expiry date | Jan 12, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/0456
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An estimation method is provided which includes: calculating a plurality of complex transfer functions, based on reception signals respectively received by N reception antenna elements during a predetermined period, the complex transfer functions each representing propagation characteristics between a transmission antenna element and the N reception antenna elements; extracting a variation component corresponding to each of the N reception antenna elements, from the calculated complex transfer functions, the variation component being caused by a living body; calculating a correlation matrix based on the variation component corresponding to each of the N reception antenna elements; calculating eigenvalues of the correlation matrix calculated in the calculating of the correlation matrix; and estimating the number of living bodies in a predetermined method, using the eigenvalues calculated in the calculating of the eigenvalues.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.