Full-frequency-range RCS (Radar Cross-Section) value pre-estimating and correcting method based on atmospheric absorption loss

An atmospheric absorption, full-band technology, used in radio wave measurement systems, instruments, etc., can solve the problems of not considering the influence of atmospheric absorption loss, affecting the accuracy of target RCS prediction, and increasing atmospheric absorption loss.

Inactive Publication Date: 2012-10-31
CHINA SHIP DEV & DESIGN CENT
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Problems solved by technology

At present, the radar cross-sectional area (hereinafter referred to as RCS) estimation technology for various targets is basically aimed at the free space environment, without considering the loss of atmospheric absorption
With the extension of the detection distance, the influence of atmospheric absorption loss gradually increases. If this factor is not considered, it will affect the estimation accuracy of the target RCS

Method used

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  • Full-frequency-range RCS (Radar Cross-Section) value pre-estimating and correcting method based on atmospheric absorption loss
  • Full-frequency-range RCS (Radar Cross-Section) value pre-estimating and correcting method based on atmospheric absorption loss
  • Full-frequency-range RCS (Radar Cross-Section) value pre-estimating and correcting method based on atmospheric absorption loss

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Embodiment 1

[0050] Suppose a target is 200km away from the detection radar, the detection frequency is 22.235GHz, P is 1 atmosphere, T is 300k, and the RCS in this detection state is 8.7dB. According to the above method, since the research frequency spectrum is f=22.235GHz, the loss in the whole detection process is dominated by water vapor absorption loss, and the absorption loss value is:

[0051] L atm = Lw = ∫ 0 h ( ξ 22 ( h ) + ξ res ( h ) ) dh = 0.18 dB

[0052] So the correction value of the echo power is about 2L atm = 0.36dB.

[0053] The RCS unit of the target in formula (12)...

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Abstract

The invention relates to a full-frequency-range RCS (Radar Cross-Section) value pre-estimating and correcting method based on an atmospheric absorption loss, which can utilize a loss caused by oxygen absorption and steam absorption under an atmospheric environment in an electromagnetic wave transmission process to correct a target RCS. In order to grasp scattering properties of each target under the atmospheric environment, the method can provide reference evidences for accurate remote sensing and detection.

Description

technical field [0001] The invention relates to a method for estimating and correcting the RCS value of a full-band target based on atmospheric absorption loss. The RCS value of the target can be estimated and corrected by calculating the full-band atmospheric absorption loss. In order to grasp the scattering of various targets in the atmospheric environment characteristics, providing a reference basis for accurate remote sensing and detection. Background technique [0002] As a medium, the atmosphere has absorption phenomenon for the propagation of electromagnetic waves, so there is a certain absorption loss in the propagating electromagnetic waves. At present, the radar cross-sectional area (hereinafter referred to as RCS) estimation technology for various targets is basically aimed at the free space environment, without considering the loss of atmospheric absorption. With the extension of the detection distance, the influence of atmospheric absorption loss gradually incr...

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Application Information

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