A method of sparse array oriented approach for DOA estimation of grating lobe target filtering includes sub-array division processing of received echoes in multiple channels; digital beamforming is performed on each sub-array obtained after division to realize DOA estimation; the echo power of the beam pointing at each angle is calculated and the peak point is detected; peak threshold discrimination processing is performed based on the determined peak threshold; if the current sub-array satisfies the identified peak threshold, the corresponding power spectrum extreme is calculated to obtain the final DOA estimation. The present invention also relates to a corresponding device, processor and computer-readable storage medium thereof. With the use of this sparse array oriented method, device, processor and computer-readable storage medium for implementing filtered DOA estimation of a gate lobe target, the interference of the gate target is effectively avoided by dividing the subarray and binarizing the angular power spectrum.

The present invention generally relates to an electromagnetic field vector sensing receive antenna array system for installation and deployment on a structure. A multipolarized array of collocated antenna elements is used to provide calibrated amplitude and phase radiation patterns with monopole, dipole, and loop modes generated from crossed loops connected to a beamformer. The invention has applications for installation and deployment on a tower, balloon, satellite for radio frequency sensing and location of low-frequency galactic emissions. The novel receive antenna array system comprises a multipolarized vector sensor antenna array. The disclosed direction-finding vector sensor can be installed and deployed on a structure and can detect and locate radio frequency emissions from galactic sources. The key system components of the receive antenna array system consist of deployable antennas, receivers, signal processing computer, and communications link.

Disclosed in the present invention is a two-dimensional direction-of-arrival estimation method for a coprime surface array based on virtual domain tensor filling, which mainly solves the problems of the loss of multi-dimensional signal structural information and the inability to fully utilize virtual domain statistics in the existing method. The steps thereof are as follows: constructing a coprime surface array; modeling a tensor of a received signal of the coprime surface array; constructing an augmented non-continuous virtual surface array based on cross-correlation tensor transformation of the coprime surface array; deriving a virtual domain tensor based on mirror extension of the non-continuous virtual surface array; dispersing contiguous missing elements by reconstructing the virtual domain tensor; filling the virtual domain tensor based on the minimization of a tensor kernel norm; and decomposing a filled virtual domain tensor to obtain a direction-of-arrival estimation result.

Certain aspects of the present disclosure provide methods and apparatus for estimating angular information, such as angle of arrival (AoA) information or angle of departure (AoD) information.

A transmit antenna system configured to steer an electromagnetic beam includes an antenna and an electronic steering module. The antenna includes a first electric antenna element oriented parallel to a first plane, a second electric antenna element oriented orthogonally to the first electric antenna element and parallel to the first plane, and a first magnetic antenna element oriented orthogonally to the first electric antenna element and the second electric antenna element. The electronic steering module is in electrical communication with each of the first electric antenna element, the second electric antenna element, and the first magnetic antenna element. The electronic steering module includes at least one amplifier configured to control the amplitude of a current to each of the first electric antenna element, the second electric antenna element, and the first magnetic antenna element.

Systems and methods are provided to simultaneously determine both angle of arrival (AoA) and angle of departure (AoD) of a signal transmitted between two or more radio frequency (RF)-enabled wireless devices (e.g., such as BLE modules). The disclosed systems and methods may be so implemented in one embodiment to determine AoD even in the case where the transmitting wireless device is at the same time operating in a departure (or AoD) transmitting mode by transmitting a RF signal from multiple antenna elements of at least one switched antenna array using a given switching pattern or sequence implemented by an array switch.

The invention relates to the method for determining the direction of arrival of radio signals in the presence of aliasing, the method using an interferometric array (12) with four antennas (16) with identical diagrams, and sampling by two distinct sampling frequencies per antenna (16), the method also comprising, for all of the detected wanted signals: the determination of the interference situation for each antenna (16), for the antennas (16) other than the antenna (16) affected by the double interference, the phase of the wanted signal, and for any antenna (16) affected by the double interference, the estimate of the phase of the wanted signal.

Provided are a system and a method for determining an angle. The method includes: determining differences between signal strengths of incident waves received by a first directional antenna of an anchor node from a tested node and signal strengths of incident waves received by a second directional antenna of the anchor node from the tested node at multiple angles, wherein the first directional antenna and the second directional antenna are mounted at a same point, and an area formed by the first directional antenna is partially superposed with an area formed by the second directional antenna; and taking an angle corresponding to a minimum difference in the differences as an angle between a line connecting the anchor node and the tested node and a horizontal reference line. The present technical solution achieves the technical effect of positioning a target accurately when the positioning device is low in complexity.

A direction finding system includes a multi-arm spiral antenna configured to receive a signal, a processor, and a memory including instructions. When executed by the processor, the instructions cause an artificial intelligence (AI) algorithm to detect amplitudes of voltage of the signal received by the multi-arm spiral antenna, estimate, by the AI algorithm, an elevation angle of the signal based on a frequency and the amplitudes of voltages of the signal, estimate, by the AI algorithm, an azimuth angle based on the frequency, the elevation angle, and the amplitudes, determine, by the AI, a rotational offset based on the frequency and a rotational model, and calculate and output, by the AI algorithm, a direction of a source of the signal based on the rotational offset and the azimuth angle.

The representative embodiments discussed in the present disclosure relate to techniques in which the transmission and reception of phase array antennas may be measured to more accurately and more efficiently estimate incidence angles of the associated RF signals. More specifically, in some embodiments, RF signals may be transmitted and received by various subsets of antennas in a pair of phased antenna arrays, and the resulting signals may adaptively filtered and fed back to perform iterations until incidence angles may be accurately determined.