Frequency diversity array synthetic aperture three-dimensional imaging radar system and imaging method thereof

Abstract

The invention discloses a frequency diversity array synthetic aperture three-dimensional imaging radar system and an imaging method thereof. The system is composed of a linear frequency diversity array radar and a motion platform (airplane). The array radar comprises a transmitting part and a receiving part, wherein the transmitting part comprises a baseband frequency selection unit, a baseband signal generator, an up-converter, an antenna selection unit and a transmitting antenna array which are sequentially connected; the receiving part comprises a receiving antenna array, an antenna selection unit, a filter and a down-conversion and imaging algorithm unit which are sequentially connected; a linear frequency diversity array radar is installed on the motion platform, and the motion platform is connected with an imaging algorithm unit of the linear frequency diversity array radar. Under the condition that a frequency diversity array is used by the system, aperture synthesis is combinedto complete target three-dimensional imaging. The imaging method is simple in transmitted signal form, the distance direction resolution can be obtained without pulse compression, and the distance direction image, the azimuth direction image and the pitching direction image of the target can be obtained at the same time through one-time phase compensation.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a frequency diversity array synthetic aperture three-dimensional imaging radar system and an imaging method thereof. Background technique [0002] Three-dimensional synthetic aperture radar (Three-dimensional Synthetic Aperture Radar, 3D-SAR) introduces linear array antennas in the vertical direction of the flight plane to form a real aperture, thus possessing three-dimensional resolution capabilities in the range direction, azimuth direction and vertical direction. The imaging process is based on the traditional two-dimensional SAR imaging principle, using pulse compression technology to obtain high resolution in the range direction, using the synthetic aperture principle to obtain high resolution in the azimuth direction, and using the real aperture to obtain high resolution in the vertical direction. However, in terms of system implementation, due to the need t...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the two-dimensional planar frequency diversity array is not easy to be used in actual scenes and is difficult to realize, the traditional linear array synthetic aperture radar transmission system is complicated, and the traditional three-dimensional synthetic aperture radar imaging algorithm is complicated. Provide a frequency diversity array synthetic aperture three-dimensional imaging radar system and its target three-dimensional imaging method, the purpose is to realize multi-target three-dimensional imaging

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