Radio circuitry wirelessly serves User Equipment (UE) with dynamic direction-of-arrival reception. Control circuitry determines a primary direction-of-arrival for a user signal and configures a digital filter for the primary direction-of-arrival. Detection circuitry filters the user signal with the digital filter configured for the primary direction-of-arrival and recovers user data from the user signal. The control circuitry determines increased radio noise and/or uplink utilization reconfigures the digital filter for multiple directions-of-arrival. The detection circuitry filters a subsequent user signal with the digital filter configured for the multiple directions-of-arrival and recovers additional user data from the subsequent user signal.

Radio circuitry wirelessly serves User Equipment (UE) with dynamic direction-of-arrival reception. Control circuitry determines a primary direction-of-arrival for a user signal and configures a digital filter for the primary direction-of-arrival. Detection circuitry filters the user signal with the digital filter configured for the primary direction-of-arrival and recovers user data from the user signal. The control circuitry determines increased radio noise and/or uplink utilization reconfigures the digital filter for multiple directions-of-arrival. The detection circuitry filters a subsequent user signal with the digital filter configured for the multiple directions-of-arrival and recovers additional user data from the subsequent user signal.

A method for direction finding of at least one incoming signal with a direction finding antenna unit is described, the direction finding antenna unit comprising at least an antenna system having several antenna elements. One antenna element is used as a reference antenna element. A subset of the several antenna elements is selected when the reference antenna element detects the incoming signal, the selected subset ensuring the best signal-to-noise ratio of all possible subsets of the several antenna elements with respect to the reference antenna element. Phase difference and orientation of the incoming signal are related to the reference antenna element. Further, a direction finding antenna unit is described.

A method for direction finding of at least one incoming signal with a direction finding antenna unit is described, the direction finding antenna unit comprising at least an antenna system having several antenna elements. One antenna element is used as a reference antenna element. A subset of the several antenna elements is selected when the reference antenna element detects the incoming signal, the selected subset ensuring the best signal-to-noise ratio of all possible subsets of the several antenna elements with respect to the reference antenna element. Phase difference and orientation of the incoming signal are related to the reference antenna element. Further, a direction finding antenna unit is described.

An array antenna includes a plurality of antennas capturing a coming radio wave and outputting a received signal respectively. An A-D converter converts the received signal to a digital signal, and a frequency detector detects a frequency of the received signal. A sparse signal processor calculates complex amplitudes, which are coefficients for base vectors, each of the base vectors expressing phases of the antennas of the array antenna receiving a radio wave coming from each direction in determined directions, used in expressing the received signal as a linear sum of a finite number of the base vectors, separates the received signal into direction signals for each direction, and calculates the phase of the each of the direction signals. A signal synthesizer aligns the phases of the direction signals using phase differences calculated from phases of the complex amplitudes, and synthesizes the direction signals.

An array antenna includes a plurality of antennas capturing a coming radio wave and outputting a received signal respectively. An A-D converter converts the received signal to a digital signal, and a frequency detector detects a frequency of the received signal. A sparse signal processor calculates complex amplitudes, which are coefficients for base vectors, each of the base vectors expressing phases of the antennas of the array antenna receiving a radio wave coming from each direction in determined directions, used in expressing the received signal as a linear sum of a finite number of the base vectors, separates the received signal into direction signals for each direction, and calculates the phase of the each of the direction signals. A signal synthesizer aligns the phases of the direction signals using phase differences calculated from phases of the complex amplitudes, and synthesizes the direction signals.

A process of screening direction finding solutions to reduce the number of valid direction finding solution rejections while maintaining an acceptable level of wild bearings being reported utilizing the proximity of the correlation values of the highest correlation and second highest correlation given a correlation pattern of a detected signal of unknown origin.

A method and apparatus for receiving signals from an unknown transmitting source and providing the location of the unknown transmitting source comprising a series of channels for receiving signals radiated by the unknown transmitting sources, generating preprocessed time domain data and generating a SAR image depicting a location of the unknown transmitting source, and a processor for processing the preprocessed time domain data to enhance a pixel value at each pixel location within the SAR image by summing signal data from each channel related to each pixel location to generate an enhanced SAR image.

A direction detection device for detecting a received-wave arrival direction of a received wave, and includes: antennas for receiving the received wave; an intensity difference imparting unit that imparts intensity differences different depending on the received-wave arrival direction to intensities of the received wave; a storage unit that stores an intensity difference table in which the intensity difference between two of the antennas is associated with the received-wave arrival direction, for each combination of any two of the antennas; a detector that detects the intensity difference between the two antennas of the received wave; an extractor that extracts, from the intensity difference table, received-wave arrival directions corresponding to the intensity difference detected by the detector, for each combination; and a comparator that compares the received-wave arrival directions extracted by the extractor between the combinations of the antennas to acquire a matched received-wave arrival direction as a detection result.

5G and especially 6G are built around beamed transmissions and receptions, but aligning the beams toward the intended recipient is currently an expensive and complex process that reduced-capability devices may have difficulty performing. Therefore, an improved beam alignment process is disclosed, involving triangle beams. A triangle beam is a wide transmission beam that is arranged to be high-power at one side and low-power at the other side, tapering monotonically between the two angles. A user device can detect the triangle beam and measure the received amplitude or power level. By comparing to the amplitude of a previous transmission, the user device can determine its angle relative to the base station. The user device can then transmit directional beams toward the base station, and can also inform the base station of the angle so that they both can use well-directed transmission and reception beams. Many other aspects are disclosed.