Abstract: A positioning device according to the present disclosure technology includes a TDOA calculator to calculate a TDOA on the basis of a peak of cross-correlation, a TDOA positioning processor to perform TDOA positioning on the basis of the TDOA, a DOA estimation processor to estimate a DOA from a reception signal received by an array antenna of at least one satellite, a DOA positioning processor to perform DOA positioning on the basis of the DOA, and an ambiguity handler to select one closest to a result calculated by the DOA positioning processor from a plurality of positioning results calculated by the TDOA positioning processor.

Abstract: A grid interval to be used in transmitting positioning augmentation information from a quasi-zenith satellite is set on the basis of statistical information of index values of occurrence degree of ionospheric disturbance for each area of the ground divided into a plurality of areas.

Abstract: The interval between grid points to which transmitting positioning augmentation information is transmitted from a quasi-zenith satellite is set according to a fluctuation of an index value of an ionospheric state for each of a plurality of areas divided on the ground.

Abstract: A radio identifying device is configured in such a manner that the radio identifying device includes a waveform pattern classifying unit that extracts a plurality of waveform patterns included in a radio signal demodulated by a signal receiving unit, and classifies each of the plurality of waveform patterns into one of groups of waveform patterns of the same types; and a feature calculating unit that calculates, for each group of waveform patterns of the same types classified by the waveform pattern classifying unit, a feature of the group of waveform patterns, and a radio identifying unit performs individual identification of a radio on the basis of the features of the respective groups of waveform patterns calculated by the feature calculating unit.

Abstract: Provided is a displacement measurement device including: a radio wave transmitter installed at a measurement position, which is configured to transmit radio waves of a plurality of frequencies from a transmission antenna; and a radio wave receiver installed at a fixed position. The radio wave transmitter includes: a plurality of reception antennas each configured to output received signals indicating the results of receiving the radio waves of the plurality of frequencies; a relative phase combining unit configured to combine, for the plurality of frequencies, relative phases between the plurality of reception antennas; a relative phase shifting unit configured to shift the relative phase between the plurality of frequencies, which is combined by the relative phase combining unit; and a positioning calculation unit configured to calculate the positioning value of the transmission antenna based on the relative phase shifted by the relative phase shifting unit.

Abstract: A configuration is provided, including a determination processor 5 that determines, using the values TDOA11,i and TDOA22,j calculated by an autocorrelation processor 4, whether the values TDOA12,k calculated by a cross-correlation processor 3 are time differences of arrival resulting from direct waves emitted from a radio source, and a positioning processor 6 that calculates the location of the radio source, using the values TDOA12,k that are determined by the determination processor 5 as being time differences of arrival resulting from direct waves and selected from among the values TDOA12,k calculated by the cross-correlation processor 3.

Abstract: A configuration is provided, including a determination processor 5 that determines, using the values TDOA11,i and TDOA22,j calculated by an autocorrelation processor 4, whether the values TDOA12,k calculated by a cross-correlation processor 3 are time differences of arrival resulting from direct waves emitted from a radio source, and a positioning processor 6 that calculates the location of the radio source, using the values TDOA12,k that are determined by the determination processor 5 as being time differences of arrival resulting from direct waves and selected from among the values TDOA12,k calculated by the cross-correlation processor 3.