公开(公告)号：US20240280510A1

公开(公告)日：2024-08-22

申请号：US18444190

申请日：2024-02-16

申请人： North Carolina State University

发明人： Usman Mahmood Khan ,  Muhammad Shahzad

IPC分类号： G01N22/04 ,  G01N33/24

CPC分类号： G01N22/04 ,  G01N33/246 ,  G01N33/245

摘要： A system for estimating moisture in soil includes a first antenna for transmitting RF signals, second antennas for receiving RF signals, and a controller configured to: emit, via the first antenna, RF signals at a plurality of frequency increments; determine a channel frequency response (CFR) based on amplitude attenuation and phase change of reflected RF signals detected by the second antennas; determine a power delay profile (PDP) for the second antennas based on the CFRs; extract a subset of the reflected RF signals using peak detection on the PDPs; and for each layer of the soil and for each of the subset of reflected RF signals, determine: i) a wavelength of the reflected RF signal in the layer, ii) an estimated depth of the layer, iii) a dielectric permittivity of the layer based on the wavelength, and iv) an estimated moisture content of the layer based on the dielectric permittivity.