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Millimeter wave radiometer receiver for target radiation characteristic measurement, and millimeter wave target radiation characteristic measuring method

A radiation characteristic and millimeter wave technology, which is applied in the field of precision measurement, can solve the problems of difficult debugging, poor flexibility, and large RF switch constraints, and achieve the effect of reducing video signal processing hardware circuit modules and reducing volume

Inactive Publication Date: 2015-11-11
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a millimeter-wave radiometer receiver and measurement method for target radiation characteristic measurement, to solve the problem that the performance of the existing improved noise-adding millimeter-wave radiometer receiver is greatly restricted by the radio frequency switch, and the video signal Deal with problems such as complex circuits, difficult debugging, and poor flexibility

Method used

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  • Millimeter wave radiometer receiver for target radiation characteristic measurement, and millimeter wave target radiation characteristic measuring method
  • Millimeter wave radiometer receiver for target radiation characteristic measurement, and millimeter wave target radiation characteristic measuring method
  • Millimeter wave radiometer receiver for target radiation characteristic measurement, and millimeter wave target radiation characteristic measuring method

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Embodiment

[0048] The antenna of the radiation characteristic measurement receiver in this embodiment is a Cassegrain antenna, with a diameter of 130mm, a working frequency of 32~36GHz, a main beam width of 3.9°, and a gain of 30dB; the working frequency of the electronically controlled attenuator is 32~36GHz, and its insertion The loss is 1.8dB, the attenuation coefficient is 35dB when the attenuation is maximum; the noise source super-noise ratio is 14dB, the coupling coefficient of the directional coupler is -13dB, and the insertion loss is 1dB; the working frequency of the isolator is 32~36GHz, and the insertion loss is 0.6dB , The isolation is 30dB; the center frequency of the local oscillator is 34GHz, the output power is 14dBm, and the frequency stability is 5MHz / ℃. The maximum insertion loss of the mixer is 7dB, the noise figure is 8dB, and the local oscillator RF port isolation is 20dB; the pre-IF amplifier is integrated in the mixer, and its working bandwidth is 100-2500MHz, and ...

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Abstract

The invention discloses a millimeter wave radiometer receiver for target radiation characteristic measurement, and a millimeter wave target radiation characteristic measuring method. The receiver comprises an antenna, an electric-control attenuator, a directional coupler, a noise source, a noise source modulator, an isolator, a local oscillator source, a mixer, an intermediate-frequency preamplifier, a band-pass filter, a main intermediate frequency amplifier, a square-law detector, a video amplifier, an integrator, a signal collecting and processing unit and a thermometer. During the measurement, the electric-control attenuator is controlled to be in an unattenuated state and a maximum attenuated state, and the signal output by the receiver is collected and processed, so that the target millimeter wave radiation characteristic measurement is achieved. The receiver of the invention solves the problems that the performance of the receiver for the noise adding type millimeter wave target radiation characteristic measurement is largely restricted by a radio frequency switch, a video signal processing circuit is complex, the debugging is difficult and the flexibility is poor. The complexity and the cost of the receiver are reduced while the reliability of the receiver is improved.

Description

Technical field [0001] The invention belongs to the technical field of precision measurement, in particular to a millimeter wave radiometer receiver and a measurement method used for target radiation characteristic measurement. Background technique [0002] As a passive measurement method, millimeter wave radiation measurement receives the millimeter wave band electromagnetic waves naturally radiated by objects above absolute zero. Due to the different performance parameters such as dielectric constant, surface roughness and shape of different objects, their radiation characteristics are quite different. It is precisely based on the difference in millimeter wave radiation characteristics between different targets that millimeter wave radiometers, which are used as target millimeter wave radiation characteristics measurement equipment, are widely used in target detection and positioning, and imaging of hidden contraband items. [0003] Among the many radiometer receiver systems use...

Claims

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Application Information

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IPC IPC(8): H04B1/16G01J5/10
Inventor 吴礼谢蓬丹彭树生许建中肖泽龙徐峰王磊
Owner NANJING UNIV OF SCI & TECH
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