As at least part of a location network, there is provided a trigger node and multiple listening nodes. The trigger node wirelessly transmits a trigger signal to the mobile device, the trigger signal being configured to cause the mobile device to wirelessly emit a signal in response to receiving the trigger signal. The listening nodes listen for the response signal that was transmitted from the mobile device in response to the trigger signal, and thereby at each respective one of a plurality of the listening nodes that wirelessly receive the response signal from the mobile device, a respective measurement is taken of the response signal as received at the respective listening node, for use in performing a localization to determine the location of the mobile device based on one or more of these measurements.

A method and apparatus for determining the position of a RFID tag. The method includes the following: (1) measuring the position of an active device to an accuracy of better than 1.0 meter using a radio locating system to determine the position of a reference point; (2) detecting a first RF signal from a reference RFID tag near the reference point with an RF receiver in an RFID reading system; (3) detecting a second RF signal from a RFID tag of interest with the RF receiver in the RFID reading system; and (4) processing both the first RF signal and the second RF signal and relying upon at least partially the position of the reference point to determine the position of the RFID tag of interest.

The proposed solution includes the use of four reference bases on the ground at known positions, with a coded time signal transmitted by one of them which is retransmitted by the repeater station and received by each of the reference bases. Using two distinct sets of three reference bases it is possible to calculate the differences between two positions for the repeater station, assigning to the later changes in time, phase or frequency as well as temporal changes due to the signal propagation in the medium, for the respective elevation angles found for the repeater. It can be then identified which values attributed to the temporal changes produces a minimum difference between the two respective positions of the repeater station. The identified temporal change can be used for the correct determination of the repeater station and its use on pertinent applications.

A frequency discriminator comprising a power splitter for splitting a signal into first and second paths, wherein the first path is configured to provide a first, straight-through signal and the second path includes a frequency-dependent element, such as low-pass filter, so as to provide a second signal. The frequency discriminator further comprises a circuit configured to compare the first and second signals and generate an instantaneous frequency signal in dependence thereon.

Provided is a positioning method performed by a user equipment (UE). The positioning method includes receiving reference signals from a plurality of base stations; acquiring phase difference information depending on a wavelength of at least one subcarrier among subcarriers included in the reference signals; calculating first estimated coordinates of the UE based on first phase difference information depending on a wavelength of a first subcarrier among the subcarriers; and calculating a first travel distance difference between the reference signals from the first estimated coordinates and estimating integer ambiguity of a second phase difference depending on a wavelength of a second subcarrier from the first travel distance difference.

Provided is a positioning method performed by a user equipment (UE). The positioning method includes receiving reference signals from a plurality of base stations; acquiring phase difference information depending on a wavelength of at least one subcarrier among subcarriers included in the reference signals; calculating first estimated coordinates of the UE based on first phase difference information depending on a wavelength of a first subcarrier among the subcarriers; and calculating a first travel distance difference between the reference signals from the first estimated coordinates and estimating integer ambiguity of a second phase difference depending on a wavelength of a second subcarrier from the first travel distance difference.

Certain aspects of the present disclosure generally relate to passive positioning based on directional transmissions, such as directional beacons transmitted during a sector sweep procedure.

An apparatus for indicating a direction of a radio transmission is described. The apparatus includes at least one vector detection device including two or more antennas and an attenuating material between at least one of the antennas and a source of a radio transmission. The attenuating material is arranged to vary an amount of attenuation with an angle of the source with respect to at least one of the antennas. The apparatus is configured to generate a signal indicating a direction of the radio transmission by comparing received signal strengths from the two or more antennas.

An apparatus for indicating a direction of a radio transmission is described. The apparatus includes at least one vector detection device including two or more antennas and an attenuating material between at least one of the antennas and a source of a radio transmission. The attenuating material is arranged to vary an amount of attenuation with an angle of the source with respect to at least one of the antennas. The apparatus is configured to generate a signal indicating a direction of the radio transmission by comparing received signal strengths from the two or more antennas.

Various systems, methods, and apparatuses are described for locating a patron and delivering an order. One example method may comprise detecting a mobile device of a customer at an establishment. The example method may further comprise determining a location of the mobile device of the customer within the establishment. The example method may further comprise linking the determined location to an order placed by the customer. The example method may further comprise enabling delivery of the order to the customer at the determined location. Similar and related methods, apparatuses, systems, and computer program products are also provided.