Frequency diversity array-based radar target imaging method

Abstract

The invention discloses a frequency diversity array-based radar target imaging method. According to the technical scheme of the invention, the time delay compensation for any net point in an imaging region is conducted to obtain an echo amplitude of each array element in a frequency diversity array at the above net point; superimposing the echo amplitudes of all array elements in the frequency diversity array to obtain a total echo response of the frequency diversity array at the above net point; changing the frequency offset of the frequency diversity array and repeating the above steps to obtain a total echo response of the frequency diversity array at the above net point in the condition of the current frequency offset; repeating the above steps and superimposing all echo responses after the modulo operation to obtain a pixel value at the above net point; traversing the imaging region to calculate the pixel values of all net points in the imaging region. In this way, the target imaging is completed. Based on the method, the decoupling for the signal echo distance and the angle of each array element of an FDA radar in a single-transmitter and single-receiver mechanism can be realized, so that the target positioning and imaging of the FDA radar can be directly realized.

Description

technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to a radar target imaging method based on a Frequency Diverse Array (Frequency Diverse Array, FDA). Background technique [0002] The biggest difference between the frequency diversity array and the ordinary uniform linear array is that there is a frequency offset between two adjacent array elements that is much smaller than the reference carrier frequency. This makes its beam pattern not only related to angle, but also dependent on distance and time, which has great application prospects in radar target detection and imaging. [0003] Radar imaging technology has a wide range of application requirements in both military and civilian fields. Traditional radar imaging technologies include synthetic aperture radar, phased array radar real aperture imaging, etc., all of which obtain high resolution in the range direction by transmitting broadband signals or pulse com...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of echo response distance and angle coupling under FDA antenna single-shot and single-receive mode, and provides a radar target imaging method based on frequency diversity array

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