Abstract: A positioning system includes a first calculation unit determining a position of a first communication device, a flying object movable with respect to the first communication device, a second communication device mounted on the flying object and communicable with the first communication device, a distance measurement unit measuring a distance between the first communication device and the flying object based on a propagation time or phase of a signal communicated between the first and second communication devices, an angle calculation unit calculating an elevation angle and an azimuth angle of the flying object with respect to the first communication device, and a second calculation unit calculating a position of the flying object based on the position determined by the first calculation unit, the distance measured by the distance measurement unit, and the elevation angle calculated by the angle calculation unit.

Abstract: A positioning system is provided with a plurality of mobile bodies for measuring positions of the plurality of mobile bodies. Each mobile body includes a positioner configured to perform positioning based on a positioning signal transmitted from a positioning satellite; a communicator configured to perform wireless communication; a distance measurer configured to measure a distance relative to another mobile body based on a propagation time or phase of a signal communicated with the communicator of the another mobile body; an angle measurer configured to calculate an angle of the mobile body of its own relative to the another mobile body based on the phase of the signal communicated with the communicator of the another mobile body; a plurality of antennas shared by the communicator, the distance measurer, and the angle measurer; and a controller configured to control the positioner, the communicator, the distance measurer, and the angle measurer.

Abstract: A distance measuring system includes a plurality of first communication stations, and a plurality of second communication stations. A first communication station of the plurality of first communication stations or a second communication station of the plurality of second communication stations includes a processor, and a memory storing program instructions that cause the processor to perform a distance measuring process of measuring a distance between the first communication station and the second communication station based on a result obtained from a signal transmitted bidirectionally between the first communication station and the second communication station, and set a frequency at which the distance measuring process is performed according to the measured distance.

Abstract: A ranging method is performed in a ranging system, the ranging system including a first communication station; and a plurality of second communication stations configured to measure a distance to the first communication station by bidirectionally transmitting and receiving signals of a plurality of frequencies to and from the first communication station, wherein when the plurality of second communication stations receive a request signal from the first communication station, the plurality of second communication stations transmit ranging data representing the measured distance to the first communication station.

Abstract: A ranging device extracts N signal pairs corresponding to N (N>=2) signal strengths excluding one or more signal strengths less than a threshold value among signal strengths of the signal pairs of the first signals and the second signals from the plurality of signal pairs, obtains a reciprocating phase obtained by summing the first phases and the second phases of the first signals and the second signals included in each signal pair for the N signal pairs, and measures a distance to the other device based on the N reciprocating phases and the plurality of frequencies.