An object detection system comprises two or more directional antennas arranged such that lobes of the antennas overlap within a designated area or volume. An electronic device detecting signals from at least two of the directional antennas is determined to be inside the area/volume, and a device detecting signals from none of the antennas or only one antenna is determined not to be inside the area/volume. In this manner, the system determines when a user has placed an electronic device within the area/volume, logs the time the electronic device is within the area/volume, and reports the logged time to the user and/or a central system. The area/volume can comprise a platform, a box, or other confined space.

An object detection system comprises two or more directional antennas arranged such that lobes of the antennas overlap within a designated area or volume. An electronic device detecting signals from at least two of the directional antennas is determined to be inside the area/volume, and a device detecting signals from none of the antennas or only one antenna is determined not to be inside the area/volume. In this manner, the system determines when a user has placed an electronic device within the area/volume, logs the time the electronic device is within the area/volume, and reports the logged time to the user and/or a central system. The area/volume can comprise a platform, a box, or other confined space.

A method for positioning a target in a building based on the assistance of two aircraft includes the following steps: allowing two aircraft with respective direction-finding devices to fly around a building, and sending a signal by a positioning tag carried by an indoor target; measuring projections of directions of the signal source on a horizontal plane respectively by the two aircraft, and indicating a position of the indoor target on the horizontal plane by an intersection of the two projections; and according to a difference between barometric pressures of the indoor target and the aircraft, obtaining an altitude of the target to further obtain position coordinates of the target. The method avoids deploying an indoor positioning base station, and improves the positioning accuracy, stability and anti-interference performance.

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.

To estimate a positional relationship between devices having transmitted and received signals with higher accuracy.

A control device includes a control unit that compares reliability parameters that are indexes indicating a degree of whether or not a signal is appropriate as a processing target for estimating a positional relationship between each of the plurality of communication devices and the other communication device, calculated on the basis of the signals received from the other communication device by the communication device, and performs control for estimating the positional relationship on the basis of a signal transmitted and received between the communication device that has received a signal that is more appropriate as a processing target for estimating the positional relationship and the other communication device.

To estimate a positional relationship between devices having transmitted and received signals with higher accuracy.

A control device includes a control unit that compares reliability parameters that are indexes indicating a degree of whether or not a signal is appropriate as a processing target for estimating a positional relationship between each of the plurality of communication devices and the other communication device, calculated on the basis of the signals received from the other communication device by the communication device, and performs control for estimating the positional relationship on the basis of a signal transmitted and received between the communication device that has received a signal that is more appropriate as a processing target for estimating the positional relationship and the other communication device.

A system and method for a second wireless device to establish distance and location of a first device which is transmitting radio waves includes the first and second devices. Each second device includes two or more (N in number) receiving antennas. An angle between the directions in which adjacent receiving antennas receive the strongest signals is 360°/N. The second device obtains a received signal strength indicator (RSSI) of each receiving antenna receiving signals from the first device, and from the two strongest receiving antennas, calculation of an angle between the first device and one of the adjacent receiving antennas can be performed. The distance between the first device and the second device can also be calculated.

A system and method for a second wireless device to establish distance and location of a first device which is transmitting radio waves includes the first and second devices. Each second device includes two or more (N in number) receiving antennas. An angle between the directions in which adjacent receiving antennas receive the strongest signals is 360°/N. The second device obtains a received signal strength indicator (RSSI) of each receiving antenna receiving signals from the first device, and from the two strongest receiving antennas, calculation of an angle between the first device and one of the adjacent receiving antennas can be performed. The distance between the first device and the second device can also be calculated.

Devices in a positioning system are described. In an example, a first device in the positioning system is configured to detect whether the first device is moving or stationary. The first device periodically send a first signal to a second device in the positioning system as long as the first device is not stationary, the first signal comprising at least a localization enabling information. When detecting that the first device is stationary the first device is further configured to send a second signal to the second device, the second signal indicating that the first device is stationary, and to stop sending the first signal.