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Shaping design method for cold air reflection mirror of microwave radiometer

A technology of cold air reflector and microwave radiometer, which is applied in the direction of mirrors, radio wave measurement systems, instruments, etc., can solve the problems of increasing the interference effect of cold air reflector, and achieve the effect of uniform energy coverage and low leakage rate

Active Publication Date: 2014-01-01
SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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AI Technical Summary

Problems solved by technology

Increasing the size of the cold air mirror can reduce the leakage rate, but it will increase the interference effect of the cold air mirror on the main antenna remote sensing observation

Method used

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  • Shaping design method for cold air reflection mirror of microwave radiometer
  • Shaping design method for cold air reflection mirror of microwave radiometer
  • Shaping design method for cold air reflection mirror of microwave radiometer

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Embodiment Construction

[0037] The invention will be described in more detail hereinafter with reference to the accompanying drawings showing embodiments of the invention. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In these drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.

[0038] The object of the present invention is to provide a method for designing the shape of the cold space reflector applied to the radiometer with feed port surface calibration method, wherein the cold space reflector is used to collect the cosmic cold space when the radiometer is calibrated in cold space. The background low-radiation signal enters the feed channel, and finally performs data processing to achieve cold spa...

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Abstract

The invention provides a shaping design method for a cold air reflection mirror of a microwave radiometer, which is applied to a feed source opening face calibration type radiometer. The shaping design method comprises the following steps: S1: determining a parabolic equation of the cold air reflection mirror so as to obtain a paraboloid parent body of the cold air reflection mirror; S2: determining a biasing angle of the cold air reflection mirror; S3: calculating energy distribution of a feed source; and S4: calculating an outline line of the cold air reflection mirror to obtain a section line of the cold air reflection mirror according to the energy distribution of the feed source, wherein the section line is rotated for one circle around the central line of the feed source to form a cone and the outline line of the cold air reflection mirror is formed by a crossed part of the cone and the paraboloid parent body. According to the shaping design method for the cold air reflection mirror of the microwave radiometer provided by the invention, special shaping is carried on the cold air reflection mirror so that the radiation leaking rate of a main antenna is reduced and the calibration precision is improved under the precondition that the cold air reflection mirror does not generate physical interference influences on remote sensing and observation of the main antenna.

Description

technical field [0001] The invention relates to the field of shape design of an offset parabolic reflector, in particular to a method for shape design of a microwave radiometer cold space reflector with low leakage rate and applied to a satellite microwave radiometer calibration system. [0002] Background technique [0003] The radiation calibration of microwave radiometer is an important part of quantitative satellite remote sensing technology, which is directly related to the detection accuracy of remote sensing. The basic principle of radiometric calibration is to establish the conversion relationship between the output signal of the remote sensing instrument and the absolute physical quantity of the observed target based on the radiometric standard source or reference signal through comparative experiments. Because the radiation response of most spaceborne remote sensing instruments has linear characteristics, radiation calibration on orbiting satellites generally requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/10G01S7/40
Inventor 苏晟钱巧元谢振超史耀强
Owner SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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