A Simulation Method for the Polarization Characteristics of Wideband Radar Targets

Abstract

The invention discloses a simulation method of polarization characteristics of a broadband radar target. The simulation method comprises the following steps: receiving a transmitting signal of a broadband radar and carrying out analog-digital conversion to convert the transmitting signal into a corresponding digital signal; acquiring the polarization characteristics of each scattering point on a one-dimensional range profile of the broadband radar target and describing by using a polarization scattering matrix; for each scattering point on the one-dimensional range profile of the broadband radar target, respectively multiplying a broadband radar input signal by the corresponding polarization scattering matrix, and carrying out polarization characteristic modulation; synthesizing the echo signal of each scattering point subjected to polarization characteristic modulation in a digital domain to respectively obtain polarization modulation signals of channels H and V; and converting the synthesized polarization modulation signals into analog signals, and outputting the analog signals. The simulation method disclosed by the invention not only can be used for overcoming the influence caused by temperature excursion of a phase shifter and an attenuator so as to improve the stability of characteristic simulation of the polarizing target, but also can be used for solving the problem that simulative polarization modulation method cannot achieve polarization characteristic simulation of the broadband radar target. The simulation method has good application prospect.

Description

technical field [0001] The invention relates to a method for simulating polarization characteristics of a broadband radar target, belonging to the technical field of radar target echo simulation. Background technique [0002] With the improvement of radar polarization theory system and polarization radar system integration technology, and the emergence of various new polarization devices, the variable polarization radar system has been applied in the fields of target detection, enhancement, filtering, cancellation and target recognition. With the development of high technology and its application in modern warfare, the struggle of electronic countermeasures is becoming more and more fierce, and the interference and anti-interference forms faced by radar are becoming more and more severe. Several modern local wars in history have shown that under interference conditions The combat performance of radar is difficult to play. Theoretical research and practice have shown that the...

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Problems solved by technology

The method for simulating the polarization characteristics of broadband radar targets of the present invention is realized by digital devices, has good temperature characteristics, solves the influence of temperature drift of analog phase shifters and analog attenuators, and improves the stability of polarization target characteristic simulation; The invented method for simulating the polarization characteristics of broadband radar targets, when the one-dimensional range image echoes of the target do not overlap in the time domain, quickly realizes the amplitude and phase modulation through digitization, which solves the problem of slow response speed of analog devices. When the echoes of the one-dimensional range image are overlapped in the time domain, the polarization modulation is synthesized in the digital domain, which solves the defect that the analog method cannot realize the modulation of different polarization characteristics of each scattering point of the one-dimensional range image

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