A method comprises using a first directional transceiver (14A) to determine a first angle (.sub.1) between a first vector (V.sub.1) from the first directional transceiver to a second directional transceiver (14B) and a second vector (V.sub.2) from the first directional transceiver to a third directional transceiver (14C), using the second directional transceiver to determine a second angle (.sub.2) between a third vector (V.sub.3) from the second directional transceiver to the first directional transceiver and a fourth vector (V.sub.4) from the second directional transceiver to the third directional transceiver, calculating a location, relative to a local coordinate system, of the third directional transceiver using the first and second angles and locations in the local coordinate system of the first and second directional transceivers, the local coordinate system being defined relative to the locations of the first, second, and third directional transceivers, and calculating an orientation relative to the local coordinate system of the first directional transceiver using directions of the first and second vectors relative to the first directional transceiver and the locations in the local coordinate system of the first, second and third directional transceivers.

A method comprises using a first directional transceiver (14A) to determine a first angle (.sub.1) between a first vector (V.sub.1) from the first directional transceiver to a second directional transceiver (14B) and a second vector (V.sub.2) from the first directional transceiver to a third directional transceiver (14C), using the second directional transceiver to determine a second angle (.sub.2) between a third vector (V.sub.3) from the second directional transceiver to the first directional transceiver and a fourth vector (V.sub.4) from the second directional transceiver to the third directional transceiver, calculating a location, relative to a local coordinate system, of the third directional transceiver using the first and second angles and locations in the local coordinate system of the first and second directional transceivers, the local coordinate system being defined relative to the locations of the first, second, and third directional transceivers, and calculating an orientation relative to the local coordinate system of the first directional transceiver using directions of the first and second vectors relative to the first directional transceiver and the locations in the local coordinate system of the first, second and third directional transceivers.

In some aspects, a wireless-signal source locator system includes wireless sensor devices distributed at distinct locations over a geographic region. The wireless sensor devices are configured to passively monitor wireless communication network signals in the geographic region. Each wireless sensor device is configured to receive a source signal wirelessly transmitted by a source (e.g., a mobile device, etc.) and a reference signal (e.g., from a synchronization source). The wireless sensor devices can generate arrival-time data based on the source signal and the reference signal. The wireless-signal source locator system further includes a data analysis system configured to receive the arrival-time data from the wireless sensor devices and to identify a location of the source based on analyzing the arrival-time data generated by three or more of the wireless sensor devices.

In some aspects, a wireless-signal source locator system includes wireless sensor devices distributed at distinct locations over a geographic region. The wireless sensor devices are configured to passively monitor wireless communication network signals in the geographic region. Each wireless sensor device is configured to receive a source signal wirelessly transmitted by a source (e.g., a mobile device, etc.) and a reference signal (e.g., from a synchronization source). The wireless sensor devices can generate arrival-time data based on the source signal and the reference signal. The wireless-signal source locator system further includes a data analysis system configured to receive the arrival-time data from the wireless sensor devices and to identify a location of the source based on analyzing the arrival-time data generated by three or more of the wireless sensor devices.

A tire localization method for a vehicle, can include: matching a first Bluetooth module in each tire of the vehicle with a second Bluetooth module of a Bluetooth host in the vehicle; acquiring first data representing a received signal strength indication of a first radio frequency signal sent by the first Bluetooth module in each tire; acquiring an angle of arrival of the first Bluetooth module in each tire relative to the second Bluetooth module; and locating each tire based on the first data and the angle of arrival.

A tire localization method for a vehicle, can include: matching a first Bluetooth module in each tire of the vehicle with a second Bluetooth module of a Bluetooth host in the vehicle; acquiring first data representing a received signal strength indication of a first radio frequency signal sent by the first Bluetooth module in each tire; acquiring an angle of arrival of the first Bluetooth module in each tire relative to the second Bluetooth module; and locating each tire based on the first data and the angle of arrival.

This specification relates to estimation of a location of a mobile device using one or more locator devices. In a first aspect, this specification describes an apparatus comprising: means for receiving, from a set of locator devices at known locations, each locator device comprising an antenna array, bearing measurements indicative of one or more bearings from the antenna array of each of the plurality of locator devices to a mobile device; means for estimating a position of the mobile device using the known location of each locator device and the bearing measurements from each locator device; means for determining, for each of the bearing measurements, an error based on the bearing measurement and the estimated position of the mobile device; means for identifying one or more bearing measurements having an error in excess of a threshold; and means for re-estimating the position of the mobile device such that the contribution of the identified one or more bearing measurements to the re-estimated position is reduced.

This specification relates to estimation of a location of a mobile device using one or more locator devices. In a first aspect, this specification describes an apparatus comprising: means for receiving, from a set of locator devices at known locations, each locator device comprising an antenna array, bearing measurements indicative of one or more bearings from the antenna array of each of the plurality of locator devices to a mobile device; means for estimating a position of the mobile device using the known location of each locator device and the bearing measurements from each locator device; means for determining, for each of the bearing measurements, an error based on the bearing measurement and the estimated position of the mobile device; means for identifying one or more bearing measurements having an error in excess of a threshold; and means for re-estimating the position of the mobile device such that the contribution of the identified one or more bearing measurements to the re-estimated position is reduced.

Disclosed is an electronic device including a plurality of antennas, and a control circuit configured to identify a two-dimensional coordinate value using signals received through the plurality of antennas and correct a signal reception angle based on the two-dimensional coordinate value, or to selectively filter data received from a signal source.

Disclosed is an electronic device including a plurality of antennas, and a control circuit configured to identify a two-dimensional coordinate value using signals received through the plurality of antennas and correct a signal reception angle based on the two-dimensional coordinate value, or to selectively filter data received from a signal source.