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Space-time correlation analysis method of multi-channel sea clutter

A correlation analysis, sea clutter technology, applied in the field of radar, can solve problems such as inability to analyze, achieve the effect of removing space-time coupling problems and improving clutter suppression capability

Inactive Publication Date: 2021-11-09
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The space-time coupling correlation can reflect the time and space decorrelation characteristics inside the clutter, but it cannot be analyzed separately

Method used

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  • Space-time correlation analysis method of multi-channel sea clutter
  • Space-time correlation analysis method of multi-channel sea clutter
  • Space-time correlation analysis method of multi-channel sea clutter

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Embodiment 1

[0040] The usage scenario of this embodiment is: the multi-channel sea clutter space-time correlation analysis method disclosed in this embodiment can be applied to sea clutter and ground clutter in different sea conditions. Firstly, the decoherence factor caused by amplitude and phase errors between channels and the decoherence factor between channels caused by noise are estimated, and then the relationship between sliding pulse, radar platform velocity and antenna channel spacing is obtained to obtain the total time decorrelation curve and the space decoherence of different range gates. In order to obtain the temporal decorrelation curve and the sea clutter spatial decorrelation curve caused by the internal motion of the sea clutter, respectively.

[0041] like figure 1As shown, the specific implementation steps of the multi-channel sea clutter space-time correlation analysis method disclosed in this embodiment are as follows:

[0042] Step 1: Calculate the decoherence fact...

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Abstract

The multi-channel sea clutter space-time correlation analysis method disclosed by the invention belongs to the technical field of radar. The implementation method of the present invention is as follows: calculate the decoherence factor caused by the amplitude and phase error between channels, and use the calibration data to calculate the signal-to-noise ratio of different channels; based on the data received by the antenna in the range Doppler domain, use the noise de-correlation formula to calculate the de-coherence factor caused by noise Coherence factor; use the relationship between the radar platform speed and the antenna channel spacing to calculate the slip pulse time decoherence curve between channels; calculate the sea clutter time decoherence curve, and obtain the clutter decorrelation time; use the sea clutter time decoherence curve to calculate The sea clutter space decorrelation curve, and the sea clutter space decorrelation lengths corresponding to different range gates are obtained. The present invention can remove the space-time coupling problem existing in the traditional clutter characteristic analysis method, provide accurate prior information for subsequent space-time adaptive processing algorithm parameter selection, and improve the radar system clutter suppression capability through the prior information.

Description

technical field [0001] The invention belongs to the technical field of radar and relates to a sea clutter characteristic analysis method, which can provide more accurate prior information for parameter selection of a space-time adaptive processing algorithm and improve the clutter suppression capability of a radar system. Background technique [0002] Space-time adaptive processing technology has superior performance in land clutter suppression, but the targets of interest in the actual radar system, including aircrafts and ships, are likely to exist in the ocean background, so it is urgent to study the impact of sea clutter characteristics on The influence of the clutter suppression algorithm lays the foundation for the subsequent target detection. [0003] Existing studies on clutter characteristics mainly include channel correlation, space-time coupling correlation, eigenvalue decomposition, etc. Channel correlation is mainly affected by noise and channel amplitude and ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S7/36
CPCG01S7/36G01S7/41
Inventor 段崇棣卜祥元李渝王伟伟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY