Up-conversion imaging system of broad band synthetic aperture

Abstract

The invention provides a method for imaging on a novel broadband synthetic aperture by frequency conversion and a system thereof. The method and the system thereof can realize the purpose of high-resolution real-time imaging detection at the wavebands of microwaves, millimeter waves and submillimeter waves, belong to an interferometric high-resolution imaging system and can be applied to the fields of remote sensing, military reconnaissance and the like. In the method, after a synthetic aperture antenna array receives a broadband radiation signal from a target, the signal is loaded on an optical wave by electro-optical modulation, and transmitted to the end by an optical fiber cable to form a shrink ratio array, and the phase preserving in the optical fiber transmission is realized by Redundant Spacing Calibration (RSC); a broadband radiation image of the target is recorded on a photonic crystal by the optical synthetic aperture imaging technology and the spectral hole burning technology, and finally sweep frequency laser beam is adopted to read out the broadband image information of the target in the photonic crystal in a real-time manner.

Description

technical field [0001] The present invention mainly relates to broadband up-conversion electro-optic modulation and passive synthetic aperture imaging technology of photonic crystal holography, especially the use of electro-optic modulated optical carrier signal for interference imaging, and redundant baseline correction (RSC) technology for optical fiber system phase maintenance. A new imaging system that ultimately utilizes chirp-modulated beams to read out broadband images of targets in photonic crystals. Background technique [0002] Passive microwave and millimeter wave imaging systems are widely used in radio astronomy research, remote sensing and military fields. Any object above absolute zero will radiate electromagnetic waves of various bands. Passive imaging detection is to detect the electromagnetic radiation and scattering of the target, and use various signal processing techniques to recover the temperature distribution map or scattering characteristic map of th...

AI Technical Summary

Problems solved by technology

If the above-mentioned up-conversion synthetic aperture imaging system is still used for broadband imaging, there will be the following two problems: (1) The light beam carrying the broadband signal is directly imaged at the focal plane of the Fourier transform lens, and these broadband images cannot be extracted and processed. Image fusion processing; (2) Since the Fourier transform lens has different focal lengths for beams of different wavelengths, there is a phase difference in the imaging process, which will lead to a decrease in the quality of the imaging

At the same time, this algorithm does not distinguish between transmission errors caused by instrumentation, antenna errors, and medium introduction.

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