In some example embodiments, there is provided a tag. The tag may include an antenna configured to receive a first radio frequency signal and to reradiate a second radio frequency signal; and an ultrasonic transducer coupled to the antenna, wherein an ultrasound signal received by the ultrasonic transducer causes a variation of at least one property of the ultrasonic transducer, wherein the variation of the at least one property imparts a modulation onto at least a portion of the first radio frequency signal, and wherein the modulated first radio frequency signal is reradiated by the antenna as the second radio frequency signal. Related system, methods, and articles of manufacture are also disclosed.

A method for close-range detection, includes transmitting, via a radar transceiver, radar signals to detect an object. The method also includes determining whether the object includes a pattern code based on reflections of the radar signals received by the radar transceiver. In response to determining that the object includes the pattern code, the method includes identifying range information about a range between the electronic device and the pattern code. The method further includes selecting, based on the range information, one or more signals from the reflections of the radar signals that are reflected off of the pattern code. Additionally, the method includes identifying, based on the one or more signals, information about the pattern code.

A method is described for determining at least one location for backscattering, by at least one transmitter device and to at least one receiver device, of an ambient radio signal, the transmitter device being associated with a zone, a backscattering and a non-backscattering operating state, and a working frequency band. Further, the method is implemented by the transmitter device when it is in the non-backscattering state and comprises travel of the transmitter device in at least one part of the zone, during which the transmitter device acquires, in the working band and in at least one location of the part of the zone, a measurement of electromagnetic power received by the transmitter device, and compares the measurement with a determined threshold, the location associated with the measurement being determined as a location for backscattering if the measurement is greater than the threshold.

Systems and methods for sensing and monitoring various athletic performance metrics, e.g., during the course of a game, a practice, a training session, training drills, and the like, are described. These systems and methods can provide useful metrics for players and coaches relating to athletic performances in various sports, including various team sports.

The invention relates to a marking object that can be placed on a vehicle child seat for adaptive actuation of an airbag, which is configured to reflect electromagnetic radiation and mark a position and/or orientation of the vehicle child seat in relation to a vehicle seat for an imaging sensor based on the reflection, in order to actuate the airbag depending on the position and/or orientation of the vehicle child seat, wherein the marking object is a Quick Response code, radar reflector, lidar reflector, or infrared reflector. The invention also relates to a vehicle child seat, a method for determining a position and/or orientation of a vehicle child seat in relation to a vehicle seat, and interior monitoring system, a computer program for adaptive actuation of an airbag and a computer readable data carrier.

The present disclosure includes systems and methods for adjusting the lane position of a vehicle. A radar system positioned on a first vehicle is configured to transmit radio waves and receive reflections of the radio waves, which produces radar data indicative of the reflections. At least one controller of the first vehicle is configured to identify at least one radar marker based on the radar data and to determine the location of the identified marker. The at least one controller is further configured to decode encoded information of the radar marker, where the information may indicate a condition associated with the roadway on which the vehicle is traveling. The at least one controller may then adjust the lane position of the vehicle based on the location of the marker and any decoded information.

Provided are a tag and a method, performed by the tag, of transmitting a response signal regarding a tag search signal. The method includes: receiving, from at least one of a plurality of slave nodes, the tag search signal including identifying data for identifying the tag; charging an energy storage element inside the tag by using the received tag search signal; obtaining the identifying data for identifying the tag from the received tag search signal; determining whether the obtained identifying data matches identification information pre-stored in the tag; and when the energy storage element is charged to a certain numerical value or above and the obtained identifying data matches the identification information pre-stored in the tag, outputting the response signal regarding the tag search signal.

A transceiver may wirelessly transmit a communication signal at a first frequency and a sensing signal at a second frequency. The communication signal may include a command that causes a backscatter node to modulate impedance of an antenna, and thereby modulate reflectivity of the backscatter node. The communication signal may also deliver wireless power to the backscatter node. While the impedance is being modulated in response to the command, the transceiver may transmit the sensing signal and measure wireless reflections. The power of the sensing signal may be much lower than that of the communication signal. The transceiver may frequency hop the sensing signal in a wide band of frequencies and take measurements at each frequency in the hopping. Based on the measurements, a computer may determine time-of-flight or phase of a reflected signal from the backscatter node and may estimate location of the backscatter node with sub-centimeter precision.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may transmit, to a second UE via reflection by one or more passive devices, a first reference signal (RS) that is based at least in part on a shared first key that corresponds to a configuration of the one or more passive devices. The first UE may receive, from the second UE via reflection, a second RS that is based at least in part on the first key. The first UE may generate a second key based at least in part on a measurement of the second RS. The first UE may transmit a positioning reference signal that is based at least in part on the second key and that is associated with a measurement of a range between the first UE and the second UE. Numerous other aspects are described.

Apparatus and associated methods relate to a method of non-contact motion detection. A one-dimensional optical sensor detects motion of a target or objects on a conveyor belt through a continuous measurement of targets or objects and a real-time comparison of the pixel images captured by the one-dimensional optical sensor. In an illustrative embodiment, a one-dimensional sensor may be configured to determine motion of objects based on changes to the captured intensities of pixel images over time. The sensor may continually capture photoelectric pixel images and compare a current pixel image with a previous pixel image to determine a frame differential image value. The frame differential image value is evaluated against a predetermined threshold over a predetermined time period. Based on the evaluation, a signal is output indicating whether the objects on the conveyor belt are moving or jammed.