Digital beam forming and phase fitting method

Abstract

The invention provides a digital beam forming and phase fitting method, and aims to provide a method capable of suppressing interference, improving the signal to interference and noise ratio and accurately controlling the phase of a beam forming signal. The method is implemented according to the technical scheme that a steering vector model obtains relative steering vectors by using online calibration, accurate absolute steering vectors are acquired by combining absolute phase responses, which are measured in a darkroom, of a reference array element, model parameters of the steering vector are fitted out by combining the existing absolute steering vectors, and an accurate spare steering vector of an antenna array in any direction is acquired; the second-order statistic of the array signal is iteratively calculated through an array signal statistic hardware calculation module, and sent to an array signal processing algorithm module together with an antenna array steering vector and a channel response to calculate an optimal beam weight; and finally, the array signal processing algorithm module imbeds the optimal beam weight into the digital beam forming module to perform real-time digital beam forming and phase fitting and process multi-channel array data and beam output in real time.

Description

technical field [0001] The present invention is concerned with digital beamforming methods in applications requiring signal separation and precise phase control in the fields of radar, radio astronomy, sonar, communications, navigation, direction finding, seismology, medical diagnosis and therapy. Specifically, it relates to a digital beam forming and phase fitting method of an antenna array steering vector model. Background technique [0002] Array signal processing techniques have been widely used in many signal processing systems over the past few decades. It forms a so-called sensor array by placing multiple sensors at different positions in space, uses the sensor array to receive space signals and then performs specific processing on the received signals, enhances useful signals of interest, and suppresses useless interference and noise Or uninteresting information, extract useful signal features, and interpret the information contained in the signal. Array antenna is...

AI Technical Summary

Problems solved by technology

Traditionally, block processing is used to transmit a piece of continuous sampling data to the microprocessor for covariance matrix calculation and inversion. This processing reduces the real-time performance of array processing, and the weight vector of beamforming cannot quickly converge to the optimal weight vector

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