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A Sea Clutter Azimuth Correlation Function Model and Its Parameter Estimation Method

A correlation function and parameter estimation technology, applied in radio wave measurement systems, instruments, etc., to achieve the effects of strong model applicability, good consistency, and simple and effective estimation methods

Inactive Publication Date: 2018-01-09
OCEAN UNIV OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to fill the research gap in sea clutter azimuth correlation modeling, and propose a sea clutter azimuth correlation function model and its parameter estimation method, which mainly solves the problem of reference units in the process of scanning radar sea surface target detection and tracking. The problem of effective selection provides a theoretical basis for the selection of target reference units

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  • A Sea Clutter Azimuth Correlation Function Model and Its Parameter Estimation Method
  • A Sea Clutter Azimuth Correlation Function Model and Its Parameter Estimation Method
  • A Sea Clutter Azimuth Correlation Function Model and Its Parameter Estimation Method

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Embodiment Construction

[0029] The sea clutter data measured by the shore-based radar is used for model verification and parameter estimation method description. The radar pulse repetition frequency used in the experiment is 1KHz, the sector scanning range is 60 degrees, and the antenna moves 0.31 degrees between adjacent wave positions. refer to figure 1 To estimate the model parameters, the steps are as follows:

[0030] Step 1. Determine the period coefficient T according to the radar parameters and scanning mode. The example radar adopts the sector scanning mode, and the scanning process is as follows: figure 2 As shown, the radar scan starts from the initial wave position, and scans toward the end wave position according to the set angle variation Δθ=0.31°, the scanning range ψ=60°, and returns to the initial wave position after completing a cycle of scanning The bit starts the next period of scanning, determined by the scanning range ψ and angle variation Δθ, T=ψ / Δθ=193.5484 can be obtained....

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Abstract

The invention discloses a sea clutter azimuth correlation function model and a parameter estimation method thereof, which mainly solve the problem of effectively selecting reference units in the process of scanning radar sea surface target detection and tracking. It is characterized in that: the sea clutter azimuth correlation function model consists of three parts: cosine function item, index item and index correction item; the period coefficient T is determined by the radar scanning range and the angular interval of adjacent wave positions; the fluctuation coefficient b is an empirical constant , ranging from 0.001 to 0.04; the modulation coefficient n is determined by sea clutter related data statistics and fluctuation coefficient b. The model proposed by the invention can effectively represent the change trend of the sea clutter azimuth correlation curve, the parameter estimation method is simple and effective, and is suitable for modeling the sea clutter azimuth correlation function under various common sea conditions.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and relates to a radar clutter space correlation function model and a parameter estimation method thereof, which can provide support for the effective selection of reference units in the radar target detection process under the sea clutter background. Background technique [0002] Sea clutter is the backscattered echo from a piece of sea surface illuminated by radar transmission signals. The mechanism of sea clutter is complex and depends on many factors. Detectability is severely restricted. In the process of radar target detection, a reference unit window of a certain size needs to be selected, and the selection of the size of the reference unit window is mainly based on the spatial correlation of sea clutter. The spatial correlation of sea clutter includes range-wise correlation and orientation correlation. [0003] The research on the spatial correlation of sea clutter at home and abro...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
Inventor 姬光荣程孝龙姬婷婷王国宇余运超
Owner OCEAN UNIV OF CHINA
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