Radar cross-section (RCS) estimation correction method for target based on water vapor absorption loss

A water vapor and target technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of increasing atmospheric absorption loss, not considering the influence of atmospheric absorption loss, affecting the target RCS prediction accuracy, etc., and achieving the goal of improving the prediction accuracy Effect

Active Publication Date: 2012-02-15
CHINA SHIP DEV & DESIGN CENT
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Problems solved by technology

At present, the RCS (Radar Cross-Section) estimation technology for various targets is basically aimed at free space environment conditions, without considering the loss effect of atmospheric absorption

Method used

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  • Radar cross-section (RCS) estimation correction method for target based on water vapor absorption loss
  • Radar cross-section (RCS) estimation correction method for target based on water vapor absorption loss
  • Radar cross-section (RCS) estimation correction method for target based on water vapor absorption loss

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Embodiment Construction

[0024] Assume that the distance between a certain target and the detection radar is h=200km, the detection frequency f is 22.235GHz, P is 1 atmospheric pressure, and T is 300k. Under the free space environment condition, the target RCS obtained in this detection state is calculated by the existing target RCS estimation technology, which is 8.7dB.

[0025] 1) According to the electromagnetic theory, the absorption coefficient ξ of water vapor at the absorption frequency of 22.235GHz±0.1GHz is given 22 (h) is:

[0026] ξ 22 ( h ) = 0.002535 { fP w ( 300 T ) 3.5 exp [ 20144 ( 1 - 300 T ) ...

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Abstract

The invention provides a radar cross-section (RCS) estimation correction method for a target based on water vapor absorption loss. On the premise that the detection distance and a detection radar are determined and the detection frequency is known, the RCS estimation correction method for K wave band targets and millimeter wave band targets is provided according to relevance between the water vapor absorption loss and a radar equation so as to provide reference for remote sensing and detection of the target in a water vapor absorption environment.

Description

technical field [0001] The invention relates to a target RCS prediction correction method based on water vapor absorption loss. Background technique [0002] As a medium, the atmosphere has absorption phenomenon for the propagation of electromagnetic waves, so there is a certain absorption loss for the electromagnetic waves propagating in it. At present, the RCS (Radar Cross-Section) estimation technology for various targets is basically aimed at the free space environment without considering the loss effect of atmospheric absorption. With the extension of the detection distance, the influence of atmospheric absorption loss gradually increases. If this factor is not considered, the estimation accuracy of the target RCS will be affected. Generally, one of the main factors for the absorption of electromagnetic waves by the atmosphere is caused by the absorption of water vapor, and the absorption of electromagnetic waves by water vapor is mainly around 22.235 GHz and above 100...

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Application Information

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IPC IPC(8): G01S7/41G01S7/40
Inventor 方重华
Owner CHINA SHIP DEV & DESIGN CENT
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