45 results about "Coprime array" patented technology

The invention belongs to the array signal processing technical field and relates to a co-prime area array-based two-dimensional direction of arrival quick estimation method. The co-prime area array-based two-dimensional direction of arrival quick estimation method includes the following steps that: of: array manifold matrixes are constructed on the basis of an x-axis and a y-axis respectively according to a co-prime area array model, two uniform sparse area arrays are combined so as to form the co-prime area array model; the covariance matrixes of the received signals of the sub-arrays are solved, the propagation operator matrixes of the arrays are constructed on the basis of the x-axis and the y-axis; a PM (Propagator Method) is adopted to solve the twiddle factor matrixes of the sub-arrays along the x-axis and y-axis on the basis of block processing performed on the array manifolds; and angle ambiguity is eliminated through using the co-prime theory of planar arrays, and the azimuthsand pitch angles of the arrays are solved. With the method of the invention adopted, low-complexity, high-precision and fuzzy-free joint estimation of the pitch angles and azimuth angles under the co-prime area array model can be realized.

The invention discloses a direction of arrival estimation method based on relatively prime array second-order equivalent virtual signal disperse Fourier inversion. The objective of the invention is tosolve problems of high calculation complexity and a failure of simultaneously estimating signals and power in the current method. The method comprises following achieving steps that a receiving end builds a relatively prime array; by use of the relatively prime array, emission signals are received and modeling is performed; according to the received signals of the relatively prime array, deviating second-order equivalent virtual signals corresponding to augmentation virtual uniform linear arrays; defining angle-space frequency and using the angle-space frequency to describe second-order equivalent virtual signals of the virtual uniform arrays; carrying out disperse Fourier inversion on the second-order virtual signals described by use of the angle-space frequency, and constructing a space-power spectrum; and according to the constructed space-power spectrum, carrying out spectrum peak searching so as to acquire direction of arrival estimation and power estimation information the signals. According to the invention, the degree of freedom of estimation of the direction of arrival is improved; calculation complexity of the direction of arrival is reduced; and power estimation information of the signals can be acquired.

The invention discloses a coprime array underdetermined direction finding method based on the atomic norm. In the invention, the antenna of the receiving end is structured according to the coprime array; modeling is performed according to the received signal of the array; the output signal of the virtual array is calculated; and the interpolation is initialized Output signal; design an optimization method based on atomic norm to restore the interpolated output signal; reconstruct the covariance matrix of the interpolated virtual uniform linear array signal; estimate the direction of arrival based on the reconstructed covariance matrix. The present invention interpolates the discontinuous virtual linear array of the coprime array to the virtual homogeneous array through interpolation, which makes full use of the degrees of freedom and array element information of the coprime array; when vectorizing the covariance matrix to obtain the output signal of the virtual array, The signals at the same position are averaged, so that the information of the signal can be fully utilized than directly selecting the first signal at the same position; the base mismatch problem of the traditional sparse representation method can be avoided, and denoising is introduced when optimizing the problem operation, improving the accuracy of direction finding.

The invention discloses a dual-layer-hybrid-array-based estimation method for a direction angle of arrival. With the method, problems of high operation load, a few of identification signal sources, and large estimation error in the prior art can be solved. The method comprises the following steps: (1), a one-layer coprime array and a two-layer nesting array are constructed respectively; (2), an output signal of the one-layer coprime array and an output signal of the two-layer nesting array are obtained; (3), on the basis of the output signal of the one-layer coprime array and the output signal of the two-layer nesting array, all four-order cumulants are calculated to form a four-order cumulant vector; (4), according to the four-order cumulant vector, an over-complete base is constructed and an airspace sparse vector is defined; (5), detection airspace direction-angle-of-arrival estimation is converted into sparse constraint equation solving; (6), with a convex optimization method, a sparest solution of an airspace sparse vector is obtained; and (7), an amplitude spectrogram is drawn based on the sparest solution and a direction angle of arrival is obtained. According to the method provided in the invention, the signal source number with identifiable arrays increases substantially under the circumstance that the array element number is limited. The method is suitable for target scouting and passive location.