Abstract: Techniques and systems for detecting and preventing unauthorized use of standard power operation by access points in moving applications are described. An example technique includes detecting movement of an access point operating in standard power mode. The operation of the AP is modified in response to detecting the movement.

Abstract: Described herein are devices, systems, methods, and processes for determining the indoor or outdoor status of an access point (AP) utilizing global navigation satellite system (GNSS) data. In many embodiments, a machine learning model is trained and utilized to distinguish between indoor, outdoor, and partially covered areas based on GNSS data features. In a number of embodiments, geometric inference is utilized to deduce the indoor or outdoor status of the AP from the relative direction of satellites that are detectable or not detectable. In a variety of embodiments, the indoor or outdoor status of the AP is inferred based on an obstacle profile constructed based on satellites that are simultaneously detectable by two or more APs. The standalone solution provides an automated approach for determining the indoor or outdoor status of an AP without relying on external services.

Abstract: Systems and techniques for mitigating interference to incumbent users in a wireless network are described. An example technique includes receiving an indication of interference on a channel that an incumbent user within a wireless network is operating on. A source of the interference is determined using key performance indicator(s), in response to the indication. A set of actions is determined and performed to mitigate the interference. Another example technique includes receiving an indication of interference on a channel that an incumbent user within a wireless network is operating on. Interference information is obtained from a controller associated with the wireless network and includes KPI(s) associated with a set of access points (APs) operating on the channel. A source of the interference is determined based on the interference information. A set of actions to mitigate the interference are determined and performed on one or more of the set of APs.

Abstract: Described herein are devices, systems, methods, and processes for estimating the geolocation of network devices by jointly utilizing pseudorange measurements from global navigation satellite system (GNSS) satellites and terrestrial-based ranging measurements between network devices. Each network device is equipped with a GNSS receiver that collects pseudorange data from each satellite link at time intervals. Terrestrial-based ranging measurements between network devices can also be collected. The receiver clock error can be accounted for at least in part by over-the-air time synchronization of network devices. To mitigate the impact of multipath and improve accuracy, pseudorange measurements with less than satisfactory quality metrics can be filtered out. In some embodiments, the geolocation of anchor network devices can be estimated with high accuracy first, and then the rest of the non-anchor network devices may be localized in a second-stage localization process.

Abstract: Accelerator apparatus (100) for accelerating charged particles (2) with pulsed radiation includes horn-shaped coupling device (10) with at least one horn coupler (11, 15) having input aperture (12), electrically conductive walls (13) and output aperture (14), wherein pulsed radiation is received at input aperture and focused towards output aperture, and waveguide device (20) coupled with the output aperture and configured for receiving focused pulsed radiation. Waveguide device includes injection section (21) for providing charged particles and subjecting them to acceleration by pulsed radiation in injection section, and lateral output port (23) for releasing accelerated charged particles along particle acceleration direction. The at least one horn coupler receives linearly polarized single cycle pulses (1) including broadband frequency spectrum shaped as a linearly polarized plane wave and focuses linearly polarized single cycle pulses. Waveguide device has non-resonant broadband transmission characteristic.

Abstract: X-ray pulse source (100) for generating X-ray pulses (1) includes electron pulse source device (10) including photo-emitter device (11) being configured for photo-induced creation of free electron pulses (2) and driver device (12) being configured for creating electromagnetic driver pulses (3) accelerating electron pulses (2) along acceleration path (7), and electromagnetic interaction device (50) comprising electromagnetic pulse source device (51) being configured for creating electromagnetic pulses (4) in interaction section (5) of electromagnetic interaction device (50), wherein electron pulse source device (10) and electromagnetic interaction device (50) are operable for generating X-ray pulses (1) by an interaction of electron pulses (2) and electromagnetic pulses (4), and driver device (12) includes THz driver pulse source (13), which is configured for creating single cycle or multi cycle THz driver pulses (3). Furthermore, a method of creating X-ray pulses (1) is described.

Abstract: A method of generating THz radiation includes the steps of generating optical input radiation with an input radiation source device (10), irradiating a first conversion crystal device (30) with the optical input radiation, wherein the first conversion crystal device (30) is arranged in a single pass configuration, and generating the THz radiation having a THz frequency in the first conversion crystal device (30) in response to the optical input radiation by an optical-to-THz-conversion process, wherein a multi-line frequency spectrum is provided by the optical input radiation in the first conversion crystal device (30), and the optical-to-THz-conversion process includes cascaded difference frequency generation using the multi-line frequency spectrum. Furthermore, a THz source apparatus being configured for generating THz radiation and applications thereof are described.

Abstract: A method of generating THz radiation includes the steps of generating optical input radiation with an input radiation source device (10), irradiating a first conversion crystal device (30) with the optical input radiation, wherein the first conversion crystal device (30) is arranged in a single pass configuration, and generating the THz radiation having a THz frequency in the first conversion crystal device (30) in response to the optical input radiation by an optical-to-THz-conversion process, wherein a multi-line frequency spectrum is provided by the optical input radiation in the first conversion crystal device (30), and the optical-to-THz-conversion process includes cascaded difference frequency generation using the multi-line frequency spectrum. Furthermore, a THz source apparatus being configured for generating THz radiation and applications thereof are described.

Abstract: Accelerator apparatus (100) for accelerating charged particles (2) with pulsed radiation includes horn-shaped coupling device (10) with at least one horn coupler (11, 15) having input aperture (12), electrically conductive walls (13) and output aperture (14), wherein pulsed radiation is received at input aperture and focused towards output aperture, and waveguide device (20) coupled with the output aperture and configured for receiving focused pulsed radiation. Waveguide device includes injection section (21) for providing charged particles and subjecting them to acceleration by pulsed radiation in injection section, and lateral output port (23) for releasing accelerated charged particles along particle acceleration direction. The at least one horn coupler receives linearly polarized single cycle pulses (1) including broadband frequency spectrum shaped as a linearly polarized plane wave and focuses linearly polarized single cycle pulses. Waveguide device has non-resonant broadband transmission characteristic.

Abstract: X-ray pulse source (100) for generating X-ray pulses (1) includes electron pulse source device (10) including photo-emitter device (11) being configured for photo-induced creation of free electron pulses (2) and driver device (12) being configured for creating electromagnetic driver pulses (3) accelerating electron pulses (2) along acceleration path (7), and electromagnetic interaction device (50) comprising electromagnetic pulse source device (51) being configured for creating electromagnetic pulses (4) in interaction section (5) of electromagnetic interaction device (50), wherein electron pulse source device (10) and electromagnetic interaction device (50) are operable for generating X-ray pulses (1) by an interaction of electron pulses (2) and electromagnetic pulses (4), and driver device (12) includes THz driver pulse source (13), which is configured for creating single cycle or multi cycle THz driver pulses (3). Furthermore, a method of creating X-ray pulses (1) is described.