Method and system for estimating directions of arrival in low power scenarios or dimension of the reduced sample.

摘要

Procedure for determining the direction of arrival of at least one waveform (wa) radio, comprising the steps of: - receiving at least one waveform (wa) by M receiving elements (1, 2, 3, 4 , ...) where M is a natural number and M 1, and obtaining a detected signal (d1, d2, d3, d4 ...) at the output of each of the M receiving elements (1, 2, 3 , 4...); - processing said detected signals M (d1, d2, d3, d4 ...) in M ​​front ends (30, 31, 32, 33 ...) for M processed signals (f1, f2, f3, f4 ... ); - sampling at N instants said N processed signals f1, f2, f3, f4 ...) in a signal processing unit (40), N being a natural number, to obtain values ​​corresponding sample; - from the samples obtained in the previous step, create N column vectors y (1), ..., and (N), where y (n) represents, for a sampling n, a vector of column with M rows, each containing one of the M rows the sample value associated with the corresponding receiving element (1, 2, 3, 4 ...) at said sampling instant n; - from the collection of N column vectors y (1), ..., and (N), calculating a spatial correlation matrix sample, - obtain all eignevectores ek where K = 1 ... M, and all the eigenvalues ​​of the spatial correlation matrix sample; the method being characterized further comprising the steps of: - from all eigenvectors ek and all eigen values ​​obtained in the previous step, obtaining a set of parameters dependent μK where K = 1 ... M signal; - from the eigenvalues ​​and μK dependent signal parameters obtained previously, build a set of weights; - find K solutions from a cost function comprising said set of weights, in which they said solutions are either local minimum or local maximum of said cost function, thereby determining such local minimum K or local maxima produced in directions respective arrival θ of said at least one radio waveform (wa).