A method of determining the location of a mobile computing device includes measuring a first time of flight (ToF) value and a first value of received energy of direct path (EDP) (P.sub.R) of a number of acknowledgement (ACK) packets received in response to a number of first probe packets sent to a first mobile device. The method calculates a preliminary distance value (d.sub.0) using a ToF-based distance equation, selects an ACK packet with a distance closest to d.sub.0 from the number of ACK packets, calculates an initial path loss exponent (.sub.0) of the selected ACK packet sample using d.sub.0 and P.sub.R. With the access point, the method also includes measuring a second P.sub.R for a second number of ACK packets received in response to a number of second probe packets sent to the first mobile device, calculates a supplemental distance value using an EDP-based distance equation and the .sub.0, and determines the location of the mobile device using multilateration and the supplemental distance value.

A method of determining the location of a mobile computing device includes measuring a first time of flight (ToF) value and a first value of received energy of direct path (EDP) (P.sub.R) of a number of acknowledgement (ACK) packets received in response to a number of first probe packets sent to a first mobile device. The method calculates a preliminary distance value (d.sub.0) using a ToF-based distance equation, selects an ACK packet with a distance closest to d.sub.0 from the number of ACK packets, calculates an initial path loss exponent (.sub.0) of the selected ACK packet sample using d.sub.0 and P.sub.R. With the access point, the method also includes measuring a second P.sub.R for a second number of ACK packets received in response to a number of second probe packets sent to the first mobile device, calculates a supplemental distance value using an EDP-based distance equation and the .sub.0, and determines the location of the mobile device using multilateration and the supplemental distance value.

Provided is a wireless positioning calibration system, including a plurality of transmission base stations, at least one sniffer base station and a positioning server. The at least one sniffer base station receives a plurality of channel state information (CSI) transmitted by the plurality of transmission base stations. The positioning server receives the plurality of CSI transmitted by the at least one sniffer base station. The positioning server calculates a phase error and an antenna spacing error generated by the at least one sniffer base station by means of the plurality of CSI, and compensates the phase error and the antenna spacing error. A wireless positioning calibration method is also provided.

Systems and methods for locating one or more radio frequency identification (RFID) tags are provided. A phase difference of received information signals of illuminated RFID tags is utilized to locate the RFID tags. One or more exciters transmit interrogation signals to illuminate the RFID tags in which the exciters may have a plurality of antenna selectively configured to transmit through two or more antennas and to receive on one antenna. Multiple reads of the same RFID tag can also be performed to generate a probability model of the location of the RFID tag. An enhanced particle filter is applied to probability model to determine the exact location of the RFID.

Systems and methods for locating one or more radio frequency identification (RFID) tags are provided. A phase difference of received information signals of illuminated RFID tags is utilized to locate the RFID tags. One or more exciters transmit interrogation signals to illuminate the RFID tags in which the exciters may have a plurality of antenna selectively configured to transmit through two or more antennas and to receive on one antenna. Multiple reads of the same RFID tag can also be performed to generate a probability model of the location of the RFID tag. An enhanced particle filter is applied to probability model to determine the exact location of the RFID.

Positioning reference signals are transmitted in a downlink direction from base stations (200) of a wireless communication network to a wireless communication device (100) or in an uplink direction from the wireless communication device (100) to base stations (200) of the wireless communication network. According to a frequency hop pattern, a radio interface of the wire-less communication device is switched between multiple different frequency ranges. In this way, the wireless communication device (100) can receive the downlink positioning reference signals on multiple different frequencies defined by the frequency hop pattern or send the uplink positioning reference signals on multiple different frequencies defined by the frequency hop pattern.

Positioning reference signals are transmitted in a downlink direction from base stations (200) of a wireless communication network to a wireless communication device (100) or in an uplink direction from the wireless communication device (100) to base stations (200) of the wireless communication network. According to a frequency hop pattern, a radio interface of the wire-less communication device is switched between multiple different frequency ranges. In this way, the wireless communication device (100) can receive the downlink positioning reference signals on multiple different frequencies defined by the frequency hop pattern or send the uplink positioning reference signals on multiple different frequencies defined by the frequency hop pattern.

An antenna receiver has antenna elements that are arranged in an array and spaced apart from each other at a distance greater than one-half wavelength of the highest operating frequency of a signal that is to be detected by the antenna receiver. The antenna receiver has geolocation logic that uses the inter-element phase difference measurements to obtain a location of the signal source. The change in the inter-element phase differences enables the elements to be spaced apart at great distances, which is beneficial for the physical construction of the platform, as the elements may be easily placed at convenient locations for conformal aerodynamic properties.

A system for identifying a cable end is provided. The system comprises: a near end for the cable, wherein the near end is visible; a far end for the cable, wherein the far end is in a hidden location; a cover assembly connected to the far end of the cable, wherein the cover assembly includes a near field communication device and a transponder, wherein the near field communication device transmits a signal through the transponder; and a device configured to communicate with the near field communication device, and further configured to facilitate a user to find the location of the cap connected to the far end.

The invention relates to a method for automatically locating an animal by means of radio waves and a plurality of nodes (1, 2, 3), wherein the animal is located on a ground (5) and is equipped with a node (1) of the radio locating system to be located and with one or more acceleration sensors. By evaluating the measurement results of the acceleration sensors, a conclusion is drawn about which activity the animal is presently performing and at which height above the ground (5) the node (1) is located. The calculation of the position of the node (1) to be located from the measurement results of the radio locating system is influenced by the assumption of said height as a constraint.