The object of the invention relates to a method for measuring distance using wave signals (l1, I2, v), the essence of which is a first and a second transceiver device (E, M) suitable for emitting and receiving wave signals (l1, I2, v) are provided, a first sensing device (O′) suitable for receiving wave signals (l1, I2, v) is arranged at a distance D′ from one of the first and second transceiver devices (E, M), wave signals (l1, I2, v) are sent and received by the first and second transceiver devices (E, M), which are also received by the first sensing device (O′), then on the basis of the distance D′, the time intervals (ΔE1E2, ΔM1M2, ΔO1′O2′, ΔE2E3, ΔM2M3, ΔO2′O3′) passing between the emitting and receipt of the wave signals (l1, I2, v) and the speed of propagation of the wave signals (l1, I2, v) the distance of the second transceiver device (M) from the first transceiver device (E), and the distance of the first sensing device (O′) from the first and second transceiver devices (E, M) are determined. The object of the invention also relates to a system (100) for measuring distance using wave signals (l1, I2, v), which contains a first and second transceiver device (E, M) suitable for emitting and receiving wave signals (l1, I2, v), as well as sensing devices (O′, 0″, O′″) suitable for receiving wave signals (l1, I2, v) arranged at a distance D′, D″, D′″ from one of the first and second transceiver devices (E, M), the essence of which is that the first and second transceiver devices (E, M), and the sensing devices (O′, 0″, O′″) are configured in a way suitable for implementing the method according to the invention.

This disclosure provides systems and methods for determining a location of a mobile device within an indoor environment. An embodiment of the system can have one or more positioning nodes (PONs), each having one or more antennas. Each PON can be disposed at a location within indoor environment and configured to transmit signals via the one or more antennas. The signals transmitted from the antennas of the PONs can be synchronized in time and frequency. A server communicatively coupled to the PONs and storing aiding information, including location and signal information related to the PONs, can transmit the aiding information to a mobile device. The mobile device can receive the signals from use the PONs and use the aiding information to determine a three dimensional position within the indoor environment based on one-way time difference of arrival of the signals.

A building management system and method for sensor time correction is described. The system comprises multiple sensors and an energy manager communicating with the sensors. The sensors, distributed within a particular area, provide multiple time measurements in response to detecting an object traversing among the sensors in which the time measurements are associated with unsynchronized time. The energy manager identifies a predicted time for traversing among the sensors based on one or more distances between pairs of sensors and an average velocity of the object to traverse among the sensors. The energy manager determines a sensor time error for each sensor by cross-correlating the time measurements with the predicted time.

TADF receivers for a navigation system, TADF navigation system and method using TADF material based navigation.

A method for assisting in locating a position of a mobile wireless device includes: obtaining location information of an approximate location of the mobile wireless device; generating an almanac of base stations based at least in part on proximity of locations of the base stations to the approximate location of the mobile wireless device, the almanac of base stations comprising at least one cooperative terrestrial base station that can communicate with the mobile wireless device in at least one mode and at least one uncooperative terrestrial base station capable of bi-directional communications and configured to prevent data and voice communications with the mobile wireless device, the at least one uncooperative terrestrial base station being configured to acknowledge a message received from the mobile wireless device; and providing the almanac of base stations to the mobile wireless device.

The present technology provides a system and a method for terminal positioning. According to a specific embodiment of the present invention, the position of a terminal is estimated using inner and outer centers obtained through points on each distance circumference generated on the basis of the RSSI of each indoor positioning sensor, a terminal correction position is derived: using an estimated terminal position derived using each distance value generated on the basis of the RSSI of each indoor positioning sensor, and the intersection points between straight lines connecting a circle with the smallest radius determined with the RSSI, the remaining two circles that excludes the circle with the smallest radius, and the estimated terminal position; and on the basis of the circular arc of the smallest circle, including the intersection points, and the ratio of the radii of the remaining two circles that excludes the smallest circle determined with the RSSI, and the estimated terminal position is corrected using the derived terminal correction position so that the accuracy of terminal position can be fundamentally improved.

TADF receivers for a navigation system, TADF navigation system and method using TADF material based navigation.

Systems and methods for locating a position of a mobile device are provided. The system can include a plurality of anchors. Each anchor can be positioned at a fixed location. The plurality of anchors can be configured to communicate with one another and with the mobile device by transmitting data packets formatted according to a media access control (MAC) frame structure. The MAC frame structure can include a beacon period for synchronizing the plurality of anchors in the system via transmission of a first set of communication packets. The MAC frame structure can include a contention-free period. The MAC frame structure can include a contention period. The system can include a position estimator configured to estimate the position of the mobile device.

A location estimation system includes a location estimation part that estimates a location of a radio wave transmission source by using radio wave strengths received by a plurality of radio wave sensors dispersedly placed in a predetermined area, propagation models, each of which represents a relationship between radio wave strengths and distance, and probability distribution models of the radio wave strengths. The location estimation part in the location estimation system estimates the location of the radio wave transmission source by using a propagation model set for an individual sub-area obtained by dividing the predetermined area based on locations of the radio wave sensors in the predetermined area and placement of an obstacle(s) in the predetermined area.

A transceiver for a wireless communication system is configured to: communicate with at least one other transceiver of the system using a sidelink resource pool of the system; transmit signals on resources of the pool that are allocated to the transceiver on a period basis with equal length periods t.sub.periodA; transmit a first signal on a first resource of the resources allocated to the transceiver, and receive a second signal from another transceiver of the system on a second resource, the second signal being transmitted by the other transceiver responsive to a reception of the first signal, the second signal being transmitted by the other transceiver on the second resource using the period t.sub.periodA based on which the resources are allocated to the transceiver; determine a distance to the other transceiver based on a time t.sub.roundA between the transmission of the first signal and the reception of the second signal from the other transceiver, and based on the period t.sub.periodA based on which the resources are allocated to the transceiver.