Passive millimeter wave focal plane image formation device

An imaging device, millimeter wave technology, applied in the direction of measuring device, radio wave measurement system, radio wave reflection/re-radiation, etc., can solve the problems of limited number of pixels and low imaging resolution

Active Publication Date: 2010-07-28
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] The present invention provides a passive millimeter-wave focal plane imaging device, which solves the problems of limited number of pixels and low imaging resolution existing in existing passive millimeter-wave focal plane imaging s

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  • Passive millimeter wave focal plane image formation device
  • Passive millimeter wave focal plane image formation device
  • Passive millimeter wave focal plane image formation device

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] Such as figure 2 As shown, the present invention includes 2 feed sources and 2 millimeter-wave radiometer channels. The 2 feed sources are arranged in a linear array on the focal plane of the focusing antenna, and are combined with scanning in the direction perpendicular to the array arrangement for imaging. Each channel The channel of the millimeter wave radiometer is composed of a radio frequency amplifier, a radio frequency filter, a mixer and an analog-to-digital converter in series. The 2 channels of intermediate frequency digital signals output by the 2 channels of the millimeter wave radiometer channel are sent to the computer for auto-correlation and cross-correlation processing. Finally, millimeter-wave images are obtained.

[0043] In each millimeter-wave radiometer channel, between the mixer and the analog-to-digital converter, an in...

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Abstract

The invention relates to a passive millimeter wave focal plane image formation device, belonging to the field of passive millimeter wave image formation device and aiming to solve the problem of limited pixel and low image formation resolution faced by the existing image formation device. The device comprises N-numbered feed sources and N-numbered millimeter wave radiometer channels; the N-numbered feed sources are arranged on the focal plane of focusing antenna in the form of linear array; each millimeter wave radiometer channel is composed of a radio-frequency amplifier, a radio-frequency filter, a frequency mixer and an A/D converter which are connected in series in sequence; N-numbered intermediate frequency digital signals are transmitted to a computer for carrying out self-correlation and mutual correlation processing, the computer obtains antenna temperature Tai and interferometry temperature Tcij, the computer then processes the antenna temperature Tai to obtain pixel value Ti and inserts the interferometry temperature Tcij between pixel value Ti and Tj to mutually form an focal plane image. In the invention, coherent image formation and incoherent image formation are effectively combined, so that the number of pixels of the image is increased and spatial resolution of image formation is improved.

Description

technical field [0001] The invention belongs to the field of passive millimeter wave imaging, and in particular relates to a passive millimeter wave focal plane imaging device. Background technique [0002] Passive Millimeter-wave (PMMW) imaging system has all-day and all-weather working capabilities, and because it does not emit electromagnetic waves, it has high concealment and anti-interference, which is safe for the human body. , security inspection, military reconnaissance and other fields have broad application prospects. The early passive millimeter-wave imaging systems used a single-channel mechanical scanning structure due to the immaturity of millimeter-wave devices. With the continuous advancement of millimeter-wave devices and the increasing application range of passive millimeter-wave technology, a natural development of this type of system is Multi-channel parallel scanning is used to increase the data rate and imaging speed. The ultimate goal is to build a la...

Claims

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Application Information

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IPC IPC(8): G01S13/89
Inventor 胡飞熊祖彪陈柯曹俊冯宇
Owner HUAZHONG UNIV OF SCI & TECH
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