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

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...

AI Technical Summary

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

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