A radar system and method are provided for reducing multipath interference signals. The multipath interference signals can be reduced by the radar system emitting electromagnetic waves that creates a null in the direction of expected multipath interference signals, such that the multipath interference signals are void (or substantially void) from signals received by the radar system.

Disclosed are methods and systems for environment detection in which a first vehicle detects its vehicle environment with at least one sensor, wherein the first vehicle transmits sensor data of the sensor pertaining to its vehicle environment to an off-board server device; at least one second vehicle with at least one sensor transmits sensor data of the sensor pertaining to its vehicle environment to the off-board server device; the off-board server device merges the transmitted sensor data of the vehicles and generates an environmental model of the vehicle environment of the first vehicle on the basis thereof; the environmental model that is generated is subsequently transmitted by the off-board server device to the first vehicle.

There is provided a radar device configured to detect a target by executing signal processing on the basis of a transmission wave and a reflection wave of the transmission wave reflected on the target. An antenna unit having a plurality of antennas arranged in a vertical direction. A calculation unit configured to calculate vertical azimuths of the target on the basis of the reflection waves with respect to the transmission waves transmitted from each of the antennas, and to accumulate calculation results. An estimation unit configured to calculate moving average values of maximum values of the vertical azimuths on the basis of the calculation results accumulated by the calculation unit, and to estimate the moving average values of the maximum values, as a height of the target.

In a general aspect, various fields of a PHY frame are used for motion detection. In some aspects, a first training field and a second, different training field are identified in a PHY frame of each wireless signal transmitted between wireless communication devices in a wireless communication network. A first time-domain channel estimate and a second time-domain channel estimate are generated for each wireless signal. The first time-domain channel estimate is based on a first frequency-domain signal included in the first training field, while the second time-domain channel estimate is based on a second frequency-domain signal included in the second training field. A determination is made whether motion has occurred in a space during the time period based on the first time-domain channel estimates, and a location of the motion within the space is determined based on the second time-domain channel estimates.

In a general aspect, various fields of a PHY frame are used for motion detection. In some aspects, a first training field and a second, different training field are identified in a PHY frame of each wireless signal transmitted between wireless communication devices in a wireless communication network. A first time-domain channel estimate and a second time-domain channel estimate are generated for each wireless signal. The first time-domain channel estimate is based on a first frequency-domain signal included in the first training field, while the second time-domain channel estimate is based on a second frequency-domain signal included in the second training field. A determination is made whether motion has occurred in a space during the time period based on the first time-domain channel estimates, and a location of the motion within the space is determined based on the second time-domain channel estimates.

This specification describes an apparatus comprising: means for receiving, at a target user equipment, UE, a signal including information indicative of supporting UE measurements of signals transmitted from the target UE to a supporting UE via a multipath communications channel, the supporting UE measurements including delay and angle measurements of the signals transmitted from the target UE to the supporting UE via the multipath communications channel; means for time-aligning the supporting UE measurements with target UE measurements of signals transmitted from the supporting UE to the target UE via the multipath communications channel, the target UE measurements including delay and angle measurements for the signals transmitted from the supporting UE to the target UE via the multipath communications channel; means for determining, based on the time-aligned measurements, an association between a component of the target UE measurements and at least one respective component of the supporting UE measurements, wherein the associated components are determined to correspond to a particular reflector in an environment of the target UE; and means for determining, based on the associated components, location information for the particular reflector.

A mechanism is provided to determine if a short-range automotive radar detection is a direct reflection or an indirect (also known as multipath) reflection from a physical target object. The multipath information is further used to perform a height estimation of the object. Embodiments provide a radar system having a range resolution smaller than a path difference between the direct reflection path and the indirect reflection path. Both range separation techniques and Doppler separation techniques are utilized to provide a reliable and accurate estimation of the height of the object.

A system and method for locating radio-frequency identification tags within a predetermined area. The method can incorporate sub-threshold superposition response mapping techniques, alone, or in combination with other methods for locating radio-frequency identification tags such as but not limited to time differential on arrival (TDOA), frequency domain phase difference on arrival (FD-PDOA), and radio signal strength indication (RSSI). The system can include a plurality of antennas dispersed in a predefined area; one or more radio-frequency identification tags; a radio-frequency transceiver in communication with said antennas; a phase modulator coupled to the radio-frequency transceiver; and a system controller in communication with said transceiver and said phase modulator. Calibration techniques can be employed to map constructive interference zones for improved accuracy.

Methods, systems, and products determine electromagnetic reflective characteristics of ambient environments. A wireless communications device sends a cellular impulse and receives reflections of the cellular impulse. The cellular impulse and the reflections of the cellular impulse may be compared to determine the electromagnetic reflective characteristics of an ambient environment.

A method and system for detection of a target by a passive radar system exploiting multichannel-per-carrier cellular illuminator sources, the method including: receiving a reference signal from a reference source, said reference signal being received at a reference element of a radar receiver of the passive radar system; receiving, at a surveillance element of said radar receiver, a reflected signal originating from said reference source and reflected off the target, said reflected signal including interference; deciphering components of said signals; and reconstructing said signals, from said components, excluding said interference.