A bi-static radar system configured for coherent detection of a radar-signal includes a plurality of radar-transceivers, a controller, and a communications device. The plurality of radar-transceivers is characterized as physically spaced apart with respect to each other. The controller is in communication with the each of the radar-transceivers and is configured to coherently operate each of the radar-transceivers. The communications device communicates both a reference-clock signal and a frame-sync signal from the controller to each of the plurality of radar-transceivers whereby the plurality of radar-transceivers operate coherently. Alternatively, the system may include a reference-signal generator, a transmitter, and a plurality of receivers. The reference-signal generator generates a reference-signal characterized by a reference-frequency proportional to a fraction of a radar-frequency of a radar-signal transmitted. The transmitter generates the radar-signal at the radar-frequency based on the reference-signal. The plurality of receivers operates coherently to detect the radar-signal based on the reference-signal.

Disclosed are techniques for scheduling uplink (UL) and downlink (DL) physical layer resources for a serving node and a user equipment (UE) for round trip time (RTT) and observed time difference of arrival (OTDOA) based positioning. In an aspect, a serving node and/or a network entity configure the UL and DL physical layer resources, and inform the UE. A network node transmits RTT measurement (RTTM) signal to the UE and receives RTT response (RTTR) signals from the UE. The network node measures the times the RTTM signals are transmitted and the times the RTTR signals are received. The UE provides to serving node processing times indicating a duration between the UE receiving the RTTM signals and the UE transmitting the RTTR signals. The RTTs are calculated from the times measured by the network node and the processing times provided by the UE.

A system (1) is configured to cause a first set of one or more radio frequency signals to be transmitted with a first transmission characteristic and/or a first reception characteristic, e.g. by lighting devices (31-37), detect whether changes in said first set of radio frequency signals are caused by a human (49) presence, detect whether the changes in the first set of radio frequency signals have a further cause, and cause a second set of one or more radio frequency signals to be transmitted with a second transmission characteristic and/or received with a second reception characteristic upon detecting that the changes in the first set of radio frequency signals have a further cause. The system is further configured to identify the further cause based on changes in the second set of radio frequency signals and provide output comprising the further cause or in dependence on the further cause.

The invention relates to a guidance system for leading an aircraft to a reference point, characterised in that it comprises: An active beacon capable of emitting a first electromagnetic signal in a first emission cone, defined by an apex coinciding with the reference point, a first beam angle and a first axis corresponding to an emission direction; and a multi-beam radar, installed on board the aircraft, operating in reception mode and capable of performing deviation measurements on a signal received from the active beacon, the multi-beam radar comprising an antenna adapted for receiving in at least two spatially separate reception cones.

A method for optimizing a surroundings model by at least one control unit, measured data being received from a first sensor set and at least one second sensor set. The first sensor set includes a first scanning area, and the second sensor set includes a second scanning area, the first scanning area and the second scanning area partially overlapping in an overlap area. A surroundings model is created for each sensor set based on the received measured data of the particular sensor set. The at least two surroundings models are compared to one another based on the overlap area and being verified. The at least two surroundings models are combined into an optimized surroundings model. A system, a control unit, a computer program, and a machine-readable memory medium, are also described.

A modular radar system comprises an antenna assembly, a support structure to which the antenna assembly is mounted, and a set of modular radar subsystems. The antenna assembly comprises an antenna array, an antenna enclosure to which the antenna array is attached and which is configured to house the antenna array and to distribute communications signals and power signals to the antenna array, and an antenna enclosure interface configured to receive inputs to and provide outputs from, the antenna array. The support structure positions the antenna array at an orientation and elevation for antenna operation. The set of modular radar subsystems is separate from the support structure and in operable communication with the antenna enclosure interface and comprises a data processing subsystem, a cooling subsystem, and an AC power subsystem supplying power to the antenna enclosure, the data processing subsystem, the cooling subsystem and to a DC power conversion subsystem.

A modular radar system comprises an antenna assembly, a support structure to which the antenna assembly is mounted, and a set of modular radar subsystems. The antenna assembly comprises an antenna array, an antenna enclosure to which the antenna array is attached and which is configured to house the antenna array and to distribute communications signals and power signals to the antenna array, and an antenna enclosure interface configured to receive inputs to and provide outputs from, the antenna array. The support structure positions the antenna array at an orientation and elevation for antenna operation. The set of modular radar subsystems is separate from the support structure and in operable communication with the antenna enclosure interface and comprises a data processing subsystem, a cooling subsystem, and an AC power subsystem supplying power to the antenna enclosure, the data processing subsystem, the cooling subsystem and to a DC power conversion subsystem.

A system and a method are provided for achieving long range, over the horizon (OTH), persistent surveillance, alerting, tracking and situational awareness against small, low radar cross section moving targets. The system and method use one or more tethered unmanned arial systems, or unmanned arial vehicles, to lift components including a radar antenna to a height above nearby obstacles or much higher. The system and method can also be used for subsurface radar detection and tracking applications, as well as communications with submarines.

A terahertz frequency-based sensing system for an agricultural harvester is provided. The system includes a terahertz sensor mounted to the agricultural harvester. The terahertz sensor at least one a terahertz source disposed to direct electromagnetic radiation toward a harvest material of the agricultural harvester. At least one terahertz detector is disposed to detect the terahertz electromagnetic radiation after the terahertz electromagnetic radiation interacts with the harvest material. A controller is operably coupled to the at least one terahertz detector and is configured to detect at least one harvest-related parameter based on a signal from the at least one terahertz detector and to perform an action based on the at least one detected parameter.

The present document provides a method by which first vehicle-to-X (V2X) user equipment (UE) for supporting distance measurement transmits a ranging response signal in a wireless communication system, the method comprising: receiving a ranging request signal from second V2X UE; and transmitting, to the second V2X UE, the ranging response signal as a response to the ranging request signal on the basis of distance measurement parameter information, wherein the distance measurement parameter information includes information on a cyclic prefix (CP) length used for the ranging response signal, and the CP length used for the ranging response signal is different from a CP length to be used in V2X data channel transmission.