Microwave photon ISAR imaging method and device

An inverse synthetic aperture and radar imaging technology, applied in measurement devices, re-radiation of electromagnetic waves, radio wave measurement systems, etc. The effect of improving radar imaging effect, improving imaging quality and reducing implementation cost

CN110632597AActive Publication Date: 2019-12-31NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-12-31

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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.
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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...

Examples

Embodiment Construction

[0042] Aiming at the deficiencies of the existing microwave photon radar technology, the idea of ​​the present invention is to first divide the reference optical signal of the microwave photon radar into two orthogonal signals with the same polarization state, and then use these two orthogonal signals as references, respectively The reflected signal is de-chirped in the optical domain, so that the complex signal processing of the microwave photonic radar echo signal can be realized with low cost and high adaptability.

[0043] The microwave photon inverse synthetic aperture radar imaging method of the present invention is specifically as follows: a single-frequency optical carrier is modulated with an intermediate-frequency chirp signal to generate a modulated optical signal, and then the modulated optical signal is converted into an electrical signal and then transmitted to a target through a transmitting antenna; Dividing the beam splitting signal of the modulated optical signa...