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.