Abstract: A method and system of creating microlocation zones by defining virtual boundaries using a system of one or more transmitters and receivers with one or more spatially-correlated antennas.

Abstract: A contact and ranging system includes a first device that includes a first transceiver, a second transceiver, and a controller to control the first transceiver and the second transceiver of the first device. The first device is operable to determine a distance between the first device and a second device. The first transceiver is configured to perform a discovery operation. Other devices are discovered and added to a list of paired devices. A ranging schedule for each paired device in the list of paired devices is determined. The second transceiver is configured to perform a ranging operation. The ranging and response transmissions are transmitted and received by a pair of devices, such that a range between the pair of devices is determined based upon a time of flight between the pair of devices. The range between the pair of devices is matched with a timestamp and stored in a database.

Abstract: 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.

Abstract: Wireless charging systems and methods for detecting foreign objects proximate the wireless charging systems. A wireless charging system (10) includes a wirelessly chargeable battery (14) that receives power from a wireless charging device (16) when the wirelessly chargeable battery (14) is proximate the wireless charging device (16). The wireless charging device (16) determines an actual electrical consumption of the wireless charging system (10), and the wirelessly charging battery (14) measures a voltage induced in the wirelessly chargeable battery (14) by the wireless charging device (16). The wireless charging device (16), the wirelessly chargeable battery (14), or a combination of the two determines an expected electrical consumption of the wireless charging system (10) based on the measured voltage, and determines whether a foreign object (12) is proximate the wireless charging system (10) based on the expected and actual electrical consumptions.

Abstract: An antenna assembly includes a circularly polarized antenna housing configured to mount to a mounting surface. The antenna assembly also includes a vertical antenna housing having a first end proximate to the circularly polarized antenna housing, as well as a distal end extending normally from the circularly polarized antenna housing.

Abstract: A method and system of creating microlocation zones by defining virtual boundaries using a system of one or more transmitters and receivers with one or more spatially-correlated antennas.

Abstract: A system is disclosed and includes a plurality of antennas. Each antenna includes a plurality of conductive elements and is circularly polarized. The plurality of conductive elements is configured to receive radio frequency (RF) signals. A first end of each of the plurality of conductive elements is electrically coupled to a printed circuit board, which includes a plurality of coupler circuits and a switching circuit. The plurality of coupler circuits is configured to combine the RF signals and output a signal to the switching circuit based on the combined RF signals. The switching circuit is configured to selectively output one of the signals based on at least one control port of the switching circuit being selectively activated by a control signal. The system also includes a microcontroller configured to determine, based on at least one of the signals, an angle of arrival associated with the plurality of antennas.

Abstract: 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 frequency modulated signal. The system may determine a phase difference between the received signals irrespective of the modulations in the signal, thereby facilitating determining an AOA.

Abstract: Apparatus and systems are disclosed and include a body having a plurality of slots. Each of the plurality of slots includes a first portion, a second portion, and a third portion. The first portion is located on a first surface of the body. The second portion is located on a second surface of the body and forms a helical shape. The third portion is located on a third surface of the body. The first surface and the second surface are non-parallel. The third surface and the second surface are non-parallel. The apparatus includes a plurality of antenna elements that are disposed in a respective one of the plurality of slots. The plurality of antenna elements is configured to receive radio frequency (RF) signals. The apparatus includes a ground plane that is coupled to a first end of each of the plurality of antenna elements.

Abstract: A method and system of creating microlocation zones by defining virtual boundaries using a system of one or more transmitters and receivers with one or more spatially-correlated antennas.

Abstract: A feed circuit for feeding an antenna includes: a first coupler including a first pair of opposing conductive elements; a second coupler including a second pair of opposing conductive elements; a third coupler including a third pair of opposing conductive elements; a delay line; first terminals configured to connect to the antenna; second terminals connected to a ground reference; and a feed terminal connected to the first coupler and configured to receive at least one of a transmit signal to be transmitted from the antenna or a combined received signal from the antenna. The first terminals are connected to the second coupler and the third coupler and configured to output a signal at different phases to conductive elements of the antenna. The second terminals are connected to the first coupler, the second coupler and the third coupler.

Abstract: A contact and ranging system includes a first device that includes a first transceiver, a second transceiver, and a controller to control the first transceiver and the second transceiver of the first device. The first device is operable to determine a distance between the first device and a second device. The first transceiver is configured to perform a discovery operation. Other devices are discovered and added to a list of paired devices. A ranging schedule for each paired device in the list of paired devices is determined. The second transceiver is configured to perform a ranging operation. The ranging and response transmissions are transmitted and received by a pair of devices, such that a range between the pair of devices is determined based upon a time of flight between the pair of devices. The range between the pair of devices is matched with a timestamp and stored in a database.

Abstract: Methods and systems are disclosed and include receiving a signal via a first communication channel at a plurality of azimuth angles. The method includes determining a plurality of first communication channel phase angle differences between a pair of antennas. The method includes receiving a second signal via a second communication channel and at the plurality of azimuth angles. The method includes determining a plurality of second communication channel phase angle differences between the pair of antennas that each correspond to one of the plurality of azimuth angles. The method includes generating a first reference curve based on the plurality of first communication channel phase angle differences. The method includes generating a second reference curve based on the plurality of second communication channel phase angle differences. The method also includes generating a calibration curve that is based on an interpolation of the first reference curve and the second reference curve.

Abstract: A method and system of creating microlocation zones by defining virtual boundaries using a system of one or more transmitters and receivers with one or more spatially-correlated antennas.

Abstract: The present invention provides a precision agricultural-device control system for controlling agricultural implements (such as seed feeders and fertilizer sprayers) or on a line planter. More particularly, a command and control module is provided that is in communication with an interface module and provides commands in accordance with a field prescription. The interface module wirelessly transmits command messages to the agricultural implements or and receives monitoring messages from the agricultural implements. In certain embodiments, a novel, low latency and high reliability wireless protocol or using repeats is used to communicate wirelessly with the agricultural implements.

Abstract: A method of communicating with a portable access device includes iteratively performing an algorithm via an access module of a vehicle. The algorithm includes a series of operations including: selecting a frequency from multiple frequencies; selecting an antenna pair from multiple possible antenna pairs, where antennas of the possible antenna pairs include antennas with different polarized axes; transmitting a packet to the portable access device via the selected antenna pair; receiving a first RSSI and a response signal from the portable access device, the first RSSI corresponds to the transmission of the packet; and measuring a second RSSI of the response signal; based on the first RSSIs and the second RSSIs. A best one of the frequencies and a best antenna pair of the possible antenna pairs are selected. One or more additional packets are transmitted using the selected best frequency and the selected best antenna pair.

Abstract: A system for detecting a range extension type relay attack includes a transmitter, a receiver and a module. The transmitter transmits a RF signal from one of a vehicle and a portable access device to the other one of the vehicle and the portable access device. The receiver receives a response signal in response to the RF signal. The module: generates a parameter associated with the transmission of the RF signal and the reception of the response signal; based on the parameter, detects the range extension type relay attack performed by an attacking device, where at least one of (i) the RF signal is relayed via the attacking device from the vehicle to the portable access device, or (ii) the response signal is relayed via the attacking device from the portable access device to the vehicle; and perform a countermeasure in response to detecting the range extension type relay attack.

Abstract: A multi-axis polarized RF antenna assembly includes a circular polarized antenna, a circular isolator, and a linear polarized antenna. The circular polarized antenna includes a conductive ring-shaped body having an inner hole. The circular isolator is connected to the conductive ring-shaped body. The linear polarized antenna is connected to the circular polarized antenna and the circular isolator and extending outward from the circular isolator. The linear polarized antenna includes a sleeve and a conductive element extending through the sleeve. The linear polarize antenna extends orthogonal to a radius of the circular polarized antenna.

Abstract: An antenna assembly includes a circularly polarized antenna housing configured to mount to a mounting surface. The antenna assembly also includes a vertical antenna housing having a first end proximate to the circularly polarized antenna housing, as well as a distal end extending normally from the circularly polarized antenna housing.

Abstract: An antenna assembly includes a circularly polarized antenna housing configured to mount to a mounting surface. The antenna assembly also includes a vertical antenna housing having a first end proximate to the circularly polarized antenna housing, as well as a distal end extending normally from the circularly polarized antenna housing.