Under-sampled multi-array cooperative frequency-measuring and direct-positioning method

Abstract

The invention belongs to the technical field of electronic information, and in particular relates to a method for measuring the frequency of a target signal from a mixed spectrum and directly positioning the target signal by utilizing multiple under-sampled array receiving signal vectors. An under-sampled multi-array cooperative frequency-measuring and direct-positioning method comprises the steps of: initializing at first, then, according to the L frame of each array and continuous N sampling receiving signal vectors of each frame, determining a sample autocorrelation matrix of the array receiving signal vectors, furthermore, determining the signal subspace of the array, then, determining the numerical value of an empty spectrum corresponding to the position grid point and each frequency grid point in a position grid point set and a frequency grid point set by utilizing the signal subspaces of all the arrays, and finally, determining the position grid point and the frequency grind point corresponding to the maximum value of a spatial spectrum as the position and the frequency of the target signal. By means of the under-sampled multi-array cooperative frequency-measuring and direct-positioning method disclosed by the invention, the multiple array receiving signal vectors are utilized; under the uniform sampling condition that the sampling rate is lower than the Nyquist sampling rate, the frequency of the target signal can be rapidly recovered from the mixed spectrum; and simultaneously, the target signal can be directly positioned.

Description

Technical field [0001] The invention belongs to the field of electronic information technology, and in particular relates to a method for determining the frequency of a target signal from an aliased spectrum by using multiple under-sampled array received signal vectors and directly positioning the target signal. Background technique [0002] The current digital signal processing requirements for the digitization of broadband receivers make the burden on the analog-to-digital converter heavier: with the increase of the required sampling rate, the speed and performance of the analog-to-digital converter and the digital signal processing chip have encountered bottlenecks. Design and manufacturing are becoming more and more difficult and expensive. Although the use of under-sampling technology can reduce the speed requirements for analog-to-digital converters and digital signal processing chips, it is followed by ambiguity in frequency estimation due to spectrum aliasing effects. Th...

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Problems solved by technology

[0004] The purpose of the present invention is to aim at the undersampling in the background technology that requires random sampling, so it is not applicable to uniform sampling, and the target signal cannot be directly positioned at the same time. Determining the frequency of the target signal from the aliased spectrum with uniform sampling at the Stern sampling rate, and at the same time directly localizing the target signal

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