Microwave photon ISAR imaging method and device

Abstract

The invention discloses a microwave photon ISAR (Inverse Synthetic Aperture Radar) imaging method, which comprises the steps of: modulating a single-frequency optical carrier by using an intermediate-frequency linear frequency modulation signal to generate a modulated optical signal, and then converting the modulated optical signal into an electric signal and transmitting the electric signal to atarget through a transmitting antenna; dividing a beam splitting signal of the modulated optical signal into two paths of orthogonal signals with the same polarization state; by taking the two paths of orthogonal signals as reference, respectively performing optical domain chirp removing processing and photoelectric conversion on a reflection signal received by a receiving antenna to obtain two paths of chirp-removed detection signals carrying target information; and finally reconstructing a radar image of the target based on the two paths of chirp-removed detection signals. The invention alsodiscloses a microwave photon ISAR imaging device. In comparison with the prior art, the microwave photon ISAR imaging method can realize complex signal processing of a microwave photon radar echo signal with low cost and high adaptability, and further improve a radar imaging effect.

Description

technical field [0001] The invention relates to the technical field of inverse synthetic aperture radar (ISAR) imaging, in particular to a microwave photon inverse synthetic aperture radar imaging method and device. Background technique [0002] Inverse synthetic aperture radar imaging is a moving target recognition technology based on advanced signal processing algorithms instead of large aperture antennas. High-resolution real-time ISAR imaging is highly desired in applications such as air traffic control, vehicle collision avoidance, and rapid security checks. To achieve this goal, ISAR first transmits microwave signals with a large instantaneous bandwidth, and then processes the received echoes quickly in the receiver. However, the linear frequency modulation (LFM) signal commonly used in high-resolution ISAR is directly generated by a direct digital synthesizer (DDS), and its frequency is limited to the order of gigahertz (GHz), so it is difficult to obtain high-resolu...

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Problems solved by technology

The polarization state of the signal light is difficult to ensure stability. Once the polarization state of the optical signal in the link changes, it is necessary to readjust the polarization controller to control the output components of the I / Q branch.

Third, the deskewing module of the radar scheme must use polarization division multiplexing-dual-drive Mach-Zehnder modulator and corresponding polarization control device, which increases the cost and complexity of the system, and is difficult to transplant to other microwave photonic radar systems middle

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