Patent ID: 8878718
Filing Date: 2014-11-04
Classification: G08B

Abstract:
1. An intruding object discrimination apparatus comprising: a transmitter circuit that generates a predetermined transmission signal and wirelessly transmits the transmission signal with a transmitting antenna apparatus; and a receiver circuit that wirelessly receives a transmitted transmission signal with a receiving antenna apparatus that is provided opposite to the transmitting antenna apparatus, and demodulates a signal that is wirelessly received into a complex demodulation signal by executing quadrature detection of the signal that is wirelessly received using the transmission signal, wherein the intruding object discrimination apparatus comprises: a normalizer that generates a normalized complex demodulation signal by normalizing a position of an inputted complex demodulation signal on a complex plane with a complex demodulation signal in a stationary state in which no intruding object intrudes between the transmitting antenna apparatus and the receiving antenna apparatus; a multiple-dimensional feature extractor that calculates a multiple-dimensional feature quantity of the normalized complex demodulation signal; and a discriminator that discriminates whether or not an intruding object is intruded between the transmitting antenna apparatus and the receiving antenna apparatus by using a predetermined discrimination plane based on a calculated multiple-dimensional feature quantity, and outputs a discrimination signal representing a discrimination result, the discrimination plane being a boundary formed of axes of the multiple-dimensional feature quantity for discriminating whether or not the intruding object is intruded between the transmitting antenna apparatus and the receiving antenna apparatus, wherein the transmitting antenna apparatus comprises a plurality of three or more transmitting antennas, wherein the receiving antenna apparatus comprises a plurality of three or more receiving antennas, wherein the transmitter circuit wirelessly transmits the transmission signal with the plurality of transmitting antennas, wherein the receiver circuit wirelessly receives transmission signals transmitted from the plurality of transmitting antennas with the plurality of receiving antennas, respectively, and demodulates signals that are wirelessly received into a plurality of complex demodulation signals, wherein the intruding object discrimination apparatus comprises: a plurality of the normalizers to which the plurality of complex demodulation signals are inputted, respectively; a plurality of the multiple-dimensional feature extractors to which a plurality of normalized complex demodulation signals are inputted from a plurality of predetermined normalizers selected from among the plurality of normalizers; and a plurality of the discriminators to which multiple-dimensional feature quantities are inputted from the plurality of the multiple-dimensional feature extractors, respectively, wherein each of the multiple-dimensional feature extractor comprises: a first feature extractor that calculates, based on one predetermined normalized complex demodulation signal selected from among a plurality of inputted normalized complex demodulation signals, a first feature quantity that changes when an intruding object is intruded between a transmitting antenna and a receiving antenna corresponding to the one predetermined normalized complex demodulation signal; a second feature extractor that calculates, based on the one predetermined normalized complex demodulation signal, a second feature quantity that changes when a space between the transmitting antenna and the receiving antenna corresponding to the one predetermined normalized complex demodulation signal is exposed to wind and rain; and a third feature extractor that calculates, based on a plurality of inputted normalized complex demodulation signals, a third feature quantity that changes when an intense electric field region that is spatially isolated from other spaces exists in the neighborhood of an intruding object between the transmitting antenna and the receiving antenna corresponding to the one predetermined normalized complex demodulation signal among spaces between the plurality of transmitting antennas and the plurality of receiving antennas, and wherein each of the discriminators discriminates whether or not the intruding object is intruded between the transmitting antenna and the receiving antenna corresponding to the one predetermined normalized complex demodulation signal, based on calculated first to third feature quantities.