Abstract: A radar system is configured to transmit at least a first and second radar packet based on a predetermined packet interval, from which scheduled packet start times are derived separated by the predetermined packet interval. The radar system delays transmission of the first radar packet by a first delay time from a first scheduled packet start time, and delays transmission of the second radar packet by a different, second delay time from a second scheduled packet start time. The radar system starts sampling of a received signal at a first time based on the first delay time to obtain a first sampled signal; starts sampling of the received signal at a second time based on the second delay time to obtain a second sampled signal; and processes the first and second sampled signals to generate respective CIR information.

Abstract: A receiver includes an ultra-wideband, UWB, communication unit configured to operate in a radar mode and to receive a synchronization signal transmitted by a transmitter, and a synchronization unit operatively coupled to the UWB communication unit. The synchronization unit is configured to estimate a carrier frequency offset from the synchronization signal, derive a reference time from the synchronization signal, and derive a time window for the reception of a radar packet by the UWB communication unit. The time window is derived from the estimated carrier frequency offset and the reference time. A corresponding method of operating a receiver also is disclosed.

Abstract: A radar system can improve performance by estimating a channel impulse response (CIR) in a way that accounts for noise arising from asymmetric interference. The system transmits a first channel-sounding sequence (CSS) that includes a first pulses and a second CSS that includes second pulses. The second pulses are complements of the first pulses. A first CIR corresponding to the first CSS and a second CIR corresponding to the second CSS are combined to produce an overall CIR that reduces or eliminates artefacts caused by asymmetric interference.

Abstract: A method for locating a device includes forming a beam from a first wireless transmitter signal and a second wireless transmitter signal at a transmitter device; performing a scan operation for a receiver device with the formed beam; evaluating at least one criterium associated with the scan operation of the formed beam; and locating the device based on the evaluated at least one criterium.

Abstract: A monostatic radar device includes a first channel with a first bandwidth, configured to receive a first radar signal, and a second channel with a second bandwidth, configured to receive a second radar signal. The first frequency band and the second frequency band are different from each other. The device includes control circuitry configured to obtain a first channel response associated with the received first signal at the first channel and obtain a second channel response associated with the received signal at the second channel, and combine the first channel response with the second channel response by channel stitching to obtain a combined channel response.

Abstract: A radar system comprising a first transmitter and a first receiver, a second transmitter and a second receiver and a processor, wherein the processor is configured to determine a channel sequence for frequency stitching; divide the channel sequence into a first portion and a second portion; instruct the first transmitter to transmit, over a first time period, an RF signal on each RF channel of the first portion of the channel sequence; instruct the second transmitter to transmit, over a second time period, an RF signal on each RF channel of the second portion of the channel sequence, wherein the second time period at least partially overlaps with the first time period; and generate a frequency-stitched channel impulse response from reflected RF signals received at each receiver in response to the RF signals transmitted.

Abstract: A radar system configured to compensate for a carrier characteristic offset includes a transmitter that transmits a code signal based on a transmitter carrier characteristic and a receiver that receives an echo of the code signal based on a receiver carrier characteristic. Additionally, the radar system includes a control unit that identifies a tracking path between the transmitter and the receiver that is at least partially independent from the path of the code signal and the echo of the code signal. Using an index of the tracking path, the code unit estimates a carrier characteristic offset between the transmitter and the receiver and then compensates for this estimated carrier characteristic offset.

Abstract: A receiver includes an ultra-wideband, UWB, communication unit configured to operate in a radar mode and to receive a synchronization signal transmitted by a transmitter, and a synchronization unit operatively coupled to the UWB communication unit. The synchronization unit is configured to estimate a carrier frequency offset from the synchronization signal, derive a reference time from the synchronization signal, and derive a time window for the reception of a radar packet by the UWB communication unit. The time window is derived from the estimated carrier frequency offset and the reference time. A corresponding method of operating a receiver also is disclosed.

Abstract: In a radiofrequency (RF) system with multiple transceivers configured to operate together (e.g., in beamforming applications), phase, delay, gain, or other offsets between individual transceivers can be compensated by pairwise measurements of RF signals transmitted by one active transmitter at a time as received by the receiver of the active transceiver and the receiver of another transceiver.

Abstract: The dynamic range of the output of a radar system with a transmitter and receiver can be optimized by determining the phase of a radar reflection signal at the receiver and adjusting the phase so that the in-phase and quadrature components of the signal have equal amplitudes. The phase can be adjusted at the receiver or by adjusting the phase of the output signal at the transmitter.

Abstract: A radar system can improve performance by estimating a channel impulse response (CIR) in a way that accounts for noise arising from asymmetric interference. The system transmits a first channel-sounding sequence (CSS) that includes a first pulses and a second CSS that includes second pulses. The second pulses are complements of the first pulses. A first CIR corresponding to the first CSS and a second CIR corresponding to the second CSS are combined to produce an overall CIR that reduces or eliminates artefacts caused by asymmetric interference.

Abstract: Provided is a method for compensating light reflections from a cover of a time-of-flight camera in an image of a scene that is sensed by the time-of-flight camera. The method includes receiving the image of the scene from the time-of-flight camera. Further, the method includes modifying the image of the scene using a reference image to obtain a compensated image of the scene. Pixels of the reference image indicate reference values exclusively related to light reflections from the cover of the time-of-flight camera. Additionally, the method includes outputting the compensated image.

Abstract: A method for compensating stray light caused by an object in a scene that is sensed by a time-of-flight camera is provided. The method includes receiving an image of the scene from the time-of-flight camera. Further, the method includes controlling the time-of-flight camera to capture a reference image of the scene using a code modulated signal for illumination such that a measurement range of the time-of-flight camera is limited to a distance range around the object. The method additionally includes modifying the image of the scene or an image derived therefrom using the reference image to obtain a compensated image of the scene. The method includes outputting the compensated image.

Abstract: It is described a radar system (100), comprising: i) a transmitter (110) having a transmitter carrier characteristic, configured to transmit a code signal (S); ii) a receiver (120) having a receiver carrier characteristic, configured to receive an echo (E) of the code signal (S); and iii) a control unit (130) configured to: a) identify a carrier characteristic tracking path (T) between the transmitter (110) and the receiver (120), b) estimate an offset between the transmitter carrier characteristic and the receiver carrier characteristic based on the identified tracking path (T), and c) compensate for the offset, in particular establish coherency, based on the estimation. iv) The tracking path (T) comprises hereby a communication path that is at least partially independent of the code signal (S) and the echo (E) of the code signal (S).

Abstract: Examples relate to a method for determining distance information of an object using a Time of Flight (ToF) system and to a ToF system. The method includes emitting modulated light towards the object using a light source. The method includes measuring a reflection of the modulated light using a ToF sensor module. The reflection of the modulated light is generated by successive reflections of the modulated light by the object and by an additional reflective surface. The method includes determining the distance information of the object based on the measured reflection of the modulated light.

Abstract: A power supply circuit is described herein which is capable of sourcing energy from an NFC antenna. In one embodiment, the circuit comprises a rectifier circuit configured to be coupled to an NFC antenna for receiving an antenna voltage, a filter coupled to an output of the rectifier circuit and configured to provide the rectified and smoothed antenna voltage as supply voltage, and a current limiting device coupled between the filter and an output node and configured to limit an output current provided at the output node dependent on a control signal. Further, the power supply circuit comprises a control circuit configured to receive the supply voltage and a reference voltage and to generate the control signal dependent on a difference between the reference voltage and the supply voltage.

Abstract: A power supply circuit is described herein which is capable of sourcing energy from an NFC antenna. In one embodiment, the circuit comprises a rectifier circuit configured to be coupled to an NFC antenna for receiving an antenna voltage, a filter coupled to an output of the rectifier circuit and configured to provide the rectified and smoothed antenna voltage as supply voltage, and a current limiting device coupled between the filter and an output node and configured to limit an output current provided at the output node dependent on a control signal. Further, the power supply circuit comprises a control circuit configured to receive the supply voltage and a reference voltage and to generate the control signal dependent on a difference between the reference voltage and the supply voltage.

Abstract: Examples relate to a method for determining distance information of an object using a Time of Flight (ToF) system and to a ToF system. The method includes emitting modulated light towards the object using a light source. The method includes measuring a reflection of the modulated light using a ToF sensor module. The reflection of the modulated light is generated by successive reflections of the modulated light by the object and by an additional reflective surface. The method includes determining the distance information of the object based on the measured reflection of the modulated light.

Abstract: A method for compensating stray light caused by an object in a scene that is sensed by a time-of-flight camera is provided. The method includes receiving an image of the scene from the time-of-flight camera. Further, the method includes controlling the time-of-flight camera to capture a reference image of the scene using a code modulated signal for illumination such that a measurement range of the time-of-flight camera is limited to a distance range around the object. The method additionally includes modifying the image of the scene or an image derived therefrom using the reference image to obtain a compensated image of the scene. The method includes outputting the compensated image.

Abstract: Provided is a method for compensating light reflections from a cover of a time-of-flight camera in an image of a scene that is sensed by the time-of-flight camera. The method includes receiving the image of the scene from the time-of-flight camera. Further, the method includes modifying the image of the scene using a reference image to obtain a compensated image of the scene. Pixels of the reference image indicate reference values exclusively related to light reflections from the cover of the time-of-flight camera. Additionally, the method includes outputting the compensated image.