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Passive synthesis aperture photon imaging method and system

A comprehensive aperture and imaging system technology, which is applied in radio wave measurement systems, radio wave reflection/re-radiation, and re-radiation, can solve the problems of passive synthetic aperture photon imaging research, system complexity, and high cost. Achieve the effects of shortening imaging processing time, improving resolution, and increasing processing speed

Inactive Publication Date: 2007-09-19
BEIHANG UNIV
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Problems solved by technology

For modern remote sensing, military reconnaissance, and anti-terrorism applications, this traditional imaging theory and method has several shortcomings: (1) The system is complex and the cost is high
For a long time, due to the characteristics of their respective technologies, the optical synthetic aperture technology and the microwave, millimeter wave and terahertz remote sensing radiometers developed in the 1980s and 1990s have been developed independently, and no passive synthesis combining the two has been seen yet. A Report on Aperture Photon Imaging Research

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  • Passive synthesis aperture photon imaging method and system
  • Passive synthesis aperture photon imaging method and system
  • Passive synthesis aperture photon imaging method and system

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[0024] Figure 2 shows a system structure diagram containing 4 antennas. In the embodiment of the invention, in order to achieve sufficient spatial frequency sampling, we use 16 receiving antennas distributed on a two-dimensional circle, and use the genetic algorithm to optimize the arrangement. The optimization results As shown in Figure 3. In the case of airborne, the radius of the circle is taken as 5m. Figure 4 shows the coverage of the spatial spectrum (u-v plane) corresponding to the antenna distribution.

[0025]According to the atmospheric transmission window, the working center frequency of the antenna array can be selected as 650GHz. Considering the cost and integration level, the currently commonly used SIS heterodyne receiver is selected. Its operating frequency range is 100 GHz to 700 GHz. This type of receiver has been used in space vehicles in Europe and America to detect terahertz waves. The antenna receives the natural radiation and scattered signals from the...

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Abstract

The invention provides a new passive synthetic aperture photonic imaging method and system, which may realize the high resolution real-time imaging detection of microwave, millimeter wave and terahertz waveband, pertains to an interference imaging remote sensing, high space resolution military detection technical field. In the invention, different from the conventional passive synthetic aperture imaging, which through the combination operation of both correlated antenna and discrete Fourier conversion method for reconfiguring the target image, after the vision radiation signal received and down conversion, through an electro-optical amplitude modulation, upload the phase position information to the light wave, combine with the redundancy spacing correction (RSC) to realize the high accuracy phase compensation, and form an array through the optical fiber transmission, finally with the optical synthetic aperture technology, directly recover the vision images in real-time through an optical system.

Description

technical field [0001] The invention mainly relates to a method and system for high-resolution remote sensing imaging and military reconnaissance, especially a method and system for real-time imaging of a synthetic aperture system using optical synthetic aperture imaging, electro-optical modulation and redundant information correction technologies. Background technique [0002] Any object above absolute zero will radiate electromagnetic waves. Passive imaging detection uses the electromagnetic radiation of the detected object and uses a specific inversion algorithm to obtain the target's brightness temperature map. For passive imaging systems, synthetic aperture technology is an effective method to obtain high spatial imaging resolution. This technology uses several small-sized and light-weight small-aperture antennas to arrange them into a sparse aperture array according to the shape and size of the carrier, according to the minimum redundant spatial frequency coverage, the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 江月松何云涛李小路
Owner BEIHANG UNIV
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