A technique for detecting a velocity state of a device includes generating multiple phase measurements for each of multiple packets emitted by the device and monitoring differences between phase measurements made for different packets. The technique further includes asserting a particular velocity state of the device based on a condition of the monitored differences.

A technique includes constructing a WCS (world coordinate system) as a three-dimensional, Cartesian coordinate system based at least in part on (i) a plurality of anchor points detected in a physical space around a device and (ii) a secondary source of information that assists in localizing objects in the physical space. The technique further includes providing the WCS to the device as a coordinate system in which to place holograms.

A system configured for rough localization of moveable cooperative targets. The system includes at least one laser tracker, having a moveable upper part connected to a base part, an optical target rough location detector automatically detecting a rough location of a cooperative target, a target fine position detector automatically detecting a fine position of a cooperative target within a fine position field of view, motors for changing an orientation of the moveable upper part, a motor controller, and a computer, a first and a second radio frequency telegram (RFT) transceiver (RFTT) anchor-module, wherein each RFTT anchor-module's position is referenced to the laser tracker, a cooperative target associated with a RFTT tag-module and each of the RFTT tag- and anchor-modules an evaluation unit configured for determining a RFT-transmission specific parameter based on the transmission of RFTs between the RFTT anchor- and tag-modules and providing said RFT-transmission specific parameter to the computer.

A measuring device (10) that is portable is configured to be capable of BLE communication with an information processing device (20). The measuring device (10) is configured to acquire living body related information of a user, receive a first advertising packet transmitted at a predetermined cycle from an information processing device (20), start encryption of the living body related information using a public key when the first advertising packet is received, calculate an estimated distance between the measuring device (10) and the information processing device (20) on the basis of a received signal strength indicator of the first advertising packet, and transmit a second advertising packet including the living body related information thus encrypted when the estimated distance is less than a first threshold.

A system and method for stabilizing a reference clock of a client transceiver to a reference terminal in the presence of relative motion between the client transceiver and the reference terminal. In some embodiments, the method includes: transmitting, by the client transceiver, a probe packet to the reference terminal, receiving, by the client transceiver, the probe packet from the reference terminal, receiving, by the client transceiver, a first synchronization packet from the reference terminal, and adjusting the rate of the reference clock based on the time elapsed between: the transmitting, by the client transceiver of the probe packet to the reference terminal, and the receiving, by the client transceiver, the probe packet from the reference terminal; and based on the time of reception, by the client transceiver, of the probe packet.

A technique for detecting a velocity state of a device includes generating multiple phase measurements for each of multiple packets emitted by the device and monitoring differences between phase measurements made for different packets. The technique further includes asserting a particular velocity state of the device based on a condition of the monitored differences.

Systems and techniques are provided for determining arrival and departure latency for WiFi devices. Reports may be received from WiFi access points in an environment. The reports include an indication of a connection to or disconnection from one of the WiFi access points, a time of the connection or disconnection, and an identifier of the one of the WiFi access points. Data including connect times and disconnect times may be generated from the reports. Sensor and device data may be received from one or more sensors or devices in the environment. Data indicating a length of an arrival latency and a length of a departure latency for the environment may be generated with a machine learning system, where the data including connect times and disconnect times and the sensor and device data is input to the machine learning system.

A system and method for locating radio-frequency identification tags within a predetermined area. The method can incorporate sub-threshold superposition response mapping techniques, alone, or in combination with other methods for locating radio-frequency identification tags such as but not limited to time differential on arrival (TDOA), frequency domain phase difference on arrival (FD-PDOA), and radio signal strength indication (RSSI). The system can include a plurality of antennas dispersed in a predefined area; one or more radio-frequency identification tags; a radio-frequency transceiver in communication with said antennas; a phase modulator coupled to the radio-frequency transceiver; and a system controller in communication with said transceiver and said phase modulator. Calibration techniques can be employed to map constructive interference zones for improved accuracy.

A method of tracking a radio beacon includes receiving radio beacon signals at electronic hub devices having known locations. The electronic hub device including both omni-directional and multi-directional antennas receiving radio beacon signals from the radio beacon. Changes over time of the received signal strengths at the omni-directional and multi-directional antennas are analyzed to determine a direction gradient or a direction of travel of the radio beacon.

A system and method for stabilizing a reference clock of a client transceiver to a reference terminal in the presence of relative motion between the client transceiver and the reference terminal. In some embodiments, the method includes: transmitting, by the client transceiver, a probe packet to the reference terminal, receiving, by the client transceiver, the probe packet from the reference terminal, receiving, by the client transceiver, a first synchronization packet from the reference terminal, and adjusting the rate of the reference clock based on the time elapsed between: the transmitting, by the client transceiver of the probe packet to the reference terminal, and the receiving, by the client transceiver, the probe packet from the reference terminal; and based on the time of reception, by the client transceiver, of the probe packet.