A system and method for determining an Angle of Arrival (AOA) for frequency modulated communications. The system may include first and second antennas spaced apart from each other by a distance, and configured to receive wireless communications in the form of a modulated signal. The system may determine a phase difference between the received signals based on one or more samples of a dedicated portion of the received signals, where one or more aspects of the dedicated portion is variable.

A position estimation method for indoor positioning includes filtering an initial position estimate that includes a corresponding covariance that reflects the quality of the geometry of the reference points and a previous initial position estimate that includes a corresponding covariance that reflects the quality of the geometry of the reference points by a Kalman filter to generate an updated previous position estimate, analyzing the updated previous position estimate to determine if the value is outside of a range, and constraining the updated previous position estimate based on the value being outside of the range.

A method and an apparatus for aligning antenna beams in a high-low frequency co-site network, where the method includes performing antenna alignment of a low frequency beam with a communications device in order to establish a low frequency channel, and performing high frequency beam alignment of a high frequency antenna with the communications device using the low frequency channel. In the method, high frequency beam alignment of a high frequency antenna is performed using an established low frequency channel. Therefore, a technical problem that a high frequency beam alignment time of a high frequency antenna is long due to a narrow field of view of a high frequency beam can be avoided in order to quickly implement high frequency beam alignment of a high frequency antenna.

Various communication systems may benefit from suitable antenna systems. For example, unmanned aircraft may benefit from systems and methods for providing a distributed airborne collision avoidance system antenna array. An apparatus can include a transceiver configured to transmit and receive avionics signals at a host vehicle. The apparatus can also include an interface configured to communicate with an array of a plurality of avionics receivers, wherein the avionics receivers are configured to receive the avionics signals at the host vehicle.

A vehicle system includes: an in-vehicle apparatus having a signal transmission unit that transmits different pulse pattern signals from multiple transmitting antennas; and a portable device having a receiving unit that receives the signals. The in-vehicle apparatus or the portable device includes a portable device position identification unit that identifies a position of the portable device according to the signals. The portable device includes a frequency-to-voltage conversion unit that outputs a voltage corresponding to a frequency of each signal. The portable device position identification unit includes: a first storage unit that preliminary stores voltage change patterns corresponding to the frequencies of the signals in relation to positions of the vehicle; and a first position estimation unit that compares the voltage change patterns of the frequency-to-voltage conversion unit with the voltage change patterns in the first storage unit, and estimates the position of the portable device.

An antenna RSSI meter includes a microcontroller unit for digitizing an antenna receiver voltage signal, converting the digitized antenna receiver voltage signal into a receiver signal level in accordance with a predefined antenna specification, and converting the receiver signal level into the antenna tuning signal in accordance with the predefined antenna specification. The antenna RSSI meter includes an input communication port for receiving the antenna receiver voltage signal from an antenna and providing the antenna receiver voltage signal to the microcontroller unit, The antenna RSSI meter also includes an output communication port for receiving the antenna tuning signal from the microcontroller unit and providing the antenna tuning signal to an antenna auto-aligning mechanism for adjusting position and orientation of the antenna.

A system for computing accurate position location coordinates of tags used for tracking assets and people include a first network of access points to help compute a first approximation of the tag position location, a second network of access points underlying the first network for fine position location determination, and a position location server for controlling the second network of access points and computing position location based on round trip delay measurements between tags and the access points.

A system includes a wireless device having a radio frequency (RF) receiver, an RF transmitter, and means for producing sensory feedback to a user of the wireless device. A position-tracking system includes at least three antennae. The position-tracking system computes a multi-dimensional position of the wireless device using triangulation or trilateration based on time of arrival information from radio signals transmitted by the RF transmitter of the wireless device and received by each of the at least three antennae. A processor receives the multi-dimensional position of the wireless device determined by the position-tracking system, correlates the multi-dimensional position to a point of interest registered with an interactive software program that produces a virtual reality environment, and generates, in response to the multi-dimensional position correlated with the registered point of interest, data configured to activate the sensory feedback producing means of the wireless device.

Output of audio or visual content via local mobile user devices (4a, 4b. 4c, 4d, 4e, 4f), such as a mobile phone and/or a headset, or via output devices (8a, 8b. 8c, 8d, 8e, 8f 8g, 8h), such as a speaker and/or a display, is controlled by a controller (7). The output devices (Sa, 8b. Sc, 8d, 8e, 8f 8g. 8h) are located at different locations within an environment for accommodating users (3a, 3b, 3c, 3d), such as the interior of a car. The controller (7) determines information on a location within the environment of each of the mobile user devices (4a, 4b, 4c, 4d, 4e, 4f) based on wireless signals received from the user devices (4a, 4b, 4c, 4d, 4e, 4f), such as Bluetooth low energy signals, and controls the output of the content based on this.

Output of audio or visual content via local mobile user devices (4a, 4b. 4c, 4d, 4e, 4f), such as a mobile phone and/or a headset, or via output devices (8a, 8b. 8c, 8d, 8e, 8f 8g, 8h), such as a speaker and/or a display, is controlled by a controller (7). The output devices (Sa, 8b. Sc, 8d, 8e, 8f 8g. 8h) are located at different locations within an environment for accommodating users (3a, 3b, 3c, 3d), such as the interior of a car. The controller (7) determines information on a location within the environment of each of the mobile user devices (4a, 4b, 4c, 4d, 4e, 4f) based on wireless signals received from the user devices (4a, 4b, 4c, 4d, 4e, 4f), such as Bluetooth low energy signals, and controls the output of the content based on this.