A device and method for improving the accuracy of angle of arrival and departure computations is disclosed. The device and method rely on manipulation of the antenna switching pattern to achieve an improved calculation of arrival angle. In one embodiment, the device calculates an estimate angle of arrival using conventional methods. The device then determines which of a plurality of different antenna switching pattern yields the more accurate results at this estimated angle of arrival. The AoA measurement is then repeated using the preferred antenna switching pattern. In another embodiment, the device captures the amplitude and/or phase of the signal from each antenna element. The device then sorts these antenna elements and defines a preferred antenna switching pattern based on the sort list. The AoA measurement is then performed using the preferred antenna switching pattern. In another embodiment, neural networks may be utilized to determine the preferred antenna switching pattern.

This application provides a relative angle-based positioning method and an apparatus. In the method, a network device can flexibly select a reference direction, and support linear array-based angle positioning. The method includes: A network device participating in positioning exchanges an uplink positioning configuration with a positioning center, a terminal device, and a serving cell that participate in positioning. The network device participating in positioning receives a first reference signal sent by the terminal device. The network device participating in positioning determines angle measurement information based on the first reference signal. The network device participating in positioning reports the angle measurement information to the positioning center, where the angle measurement information includes a set reference direction and an angle of a direction of the terminal device relative to the set reference direction. The positioning center determines a location of the terminal device based on the received angle measurement information.

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.

An interrogation device, for locating a wireless device, includes a receiver and digital processing circuitry. The receiver includes one or more receiver stages having adjustable gains, and is configured to receive from the wireless device a signal that carries a packet including a direction-finding field, wherein, during reception of the direction-finding field, multiple different temporal sections of the received signal traverse different wireless channels due to switching among different antennas in the interrogation device or in the wireless device and thus have multiple different received-signal levels. The digital processing circuitry is configured, based on the multiple received temporal sections of the signal during reception of the direction-finding field, to (i) adapt the adjustable gains of the receiver stages and (ii) estimate a position of the wireless device.

A system includes a first computing device having a first non-transitory machine-readable storage medium, first communication circuitry, and at least one first processor in communication with the first non-transitory machine-readable storage medium and the first communication circuitry. The at least one first processor is configured to execute instructions stored in the first non-transitory machine-readable storage medium to cause the first communication circuitry to receive a first signal from a first transmission medium, calculate a first authentication value for an object based on data included in the first signal, and cause the first communication circuitry to transmit a second signal to the first transmission medium. The second signal identifies whether the object is authentic based, at least in part, on the first authentication value.

A system includes a first computing device having a first non-transitory machine-readable storage medium, first communication circuitry, and at least one first processor in communication with the first non-transitory machine-readable storage medium and the first communication circuitry. The at least one first processor is configured to execute instructions stored in the first non-transitory machine-readable storage medium to cause the first communication circuitry to receive a first signal from a first transmission medium, calculate a first authentication value for an object based on data included in the first signal, and cause the first communication circuitry to transmit a second signal to the first transmission medium. The second signal identifies whether the object is authentic based, at least in part, on the first authentication value.

A method of localizing a near vertical incidence skywave emitter. At a first site a first elevation angle of an incoming signal issued by the near vertical incidence skywave emitter is measured. At a second site a second elevation angle of an incoming signal issued by the near vertical incidence skywave emitter is measured, wherein the second site is different to the first site. The first elevation angle measured and the second elevation angle measured are converted into a first length and a second length respectively, which represent the distance between the respective site and the estimated location of the near vertical incidence skywave emitter. The respective length is processed, thereby generating an estimated area of the near vertical incidence skywave emitter for each of the different sites such that at least two different estimated areas are generated. The estimated areas for each site are superimposed, thereby obtaining an area of interest encompassing the estimated location of the near vertical incidence skywave emitter. Further, a direction finding system is described.

A method of localizing a near vertical incidence skywave emitter. At a first site a first elevation angle of an incoming signal issued by the near vertical incidence skywave emitter is measured. At a second site a second elevation angle of an incoming signal issued by the near vertical incidence skywave emitter is measured, wherein the second site is different to the first site. The first elevation angle measured and the second elevation angle measured are converted into a first length and a second length respectively, which represent the distance between the respective site and the estimated location of the near vertical incidence skywave emitter. The respective length is processed, thereby generating an estimated area of the near vertical incidence skywave emitter for each of the different sites such that at least two different estimated areas are generated. The estimated areas for each site are superimposed, thereby obtaining an area of interest encompassing the estimated location of the near vertical incidence skywave emitter. Further, a direction finding system is described.

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.