Large-diameter wideband reception phased-array antenna

Abstract

A large-diameter wideband reception phased-array antenna is characterized in that (1) the reception phased-array antenna employs a sub-array structure, N array elements are divided into L sub-arrays, each sub-array is an independent simulation narrowband phased-array antenna, an output signal of each sub-array is x(t), and I is 1, 2 until L; (2) the output signal of a first sub-array is converted to a digital signal y(k) by an analog-digital converter (ADC), y(k) passes through a digital delay filter, a filter coefficient vector c=[c<I1> until c<IJ>], J is filter order, the realization function of a first digital delay filter is in a way that an input signal is delayed by time span being Tau, and the output signal is z(k); (3) the digital delay filter corresponding to each sub-array employs a Farrow filter structure, namely, a coefficient is shown as specification, and the coefficient Zeta(j) is calculated by a frequency domain weighting method; and (4) the final output p(k) of the phased-array antenna is sum of outputs of all digital delay filters, namely, p(k) is shown as specification. By the large-diameter wideband reception phased-array antenna, the problems of spatial dispersion and time dispersion of the phased-array antenna are solved, and the phased-array antenna can be applied to the field of the large-diameter wideband phased-array antenna for radar and communication.

Description

technical field [0001] The invention relates to the field of phased array antennas, in particular to a large-diameter broadband receiving phased array antenna. Background technique [0002] The signal received by each element of the array antenna is a far-field plane wave. Due to the wave path difference, the delay between the signals received by the array elements is different, that is, there is a difference in phase. The phased array antenna adjusts the phase of the received signal by weighting the phase of the signal received by each array element, thereby correcting these phase differences and completing beam synthesis, which is equivalent to making the main lobe of the antenna beam point to the incident direction of the signal. Due to the reasons of "spatial dispersion" and "time dispersion", the working mode of this traditional phased array antenna is only suitable for small-aperture narrow-band systems. Specifically, on the one hand, the weight vector is calculated a...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the large-diameter broadband phased array antenna, the traditional narrow-band phased array antenna weighting method cannot overcome the "spatial dispersion" and "time dispersion". Broadband phased array antennas also have the problem of low delay control accuracy. These reasons lead to deviations in the beam pointing of large-aperture broadband phased array antennas and a decrease in antenna gain

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