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Space tracking filter-based sea clutter suppression and target detection method

A space tracking and target detection technology, applied in the field of sea clutter analysis, can solve problems such as difficulty in distinguishing target trajectories and high requirements for motion trajectories

Inactive Publication Date: 2010-08-18
TSINGHUA UNIV
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Problems solved by technology

For the target to move in a straight line on the time-distance plane, the target can be detected from the chaotic sea clutter by using the Radon change. This algorithm

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  • Space tracking filter-based sea clutter suppression and target detection method
  • Space tracking filter-based sea clutter suppression and target detection method
  • Space tracking filter-based sea clutter suppression and target detection method

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Embodiment Construction

[0065] The present invention will be further described below in conjunction with the accompanying drawings and embodiments of the description.

[0066] The sea clutter suppression and target detection method based on space tracking filter, the implementation steps are as follows:

[0067] Step 1: Enter

[0068] The echo data of the non-coherent radar along the same radial direction is taken as input, denoted as M(n)n=1, 2, 3, . . .

[0069] Step 2: Modeling and Estimation of Sea Clutter Radial Amplitude

[0070] We regard the motion process of sea clutter along the radial direction as a discrete Markov model, figure 1 is a schematic diagram of the large-scale structure of sea clutter, such as figure 1 As shown, Ya represents the estimated value of the sea clutter amplitude; Ys represents the estimated value of the slope of the sea clutter amplitude; Ya_p represents the predicted value of the amplitude; Ys_p represents the predicted slope; M represents the observed value of ...

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Abstract

The invention discloses a space tracking filter-based sea clutter suppression and target detection method, which belongs to the technical field of sea clutter analysis of marine target radar detection and tracking. The method is implemented by the following steps: establishing a state equation and an observation equation by taking the radial non-coherent radar echo data as the input and the echo amplitude and the conversion slope of amplitude as a state vector; designing an optimal alpha-beta-gamma filter under a linear condition to track the low-frequency sea clutter and estimate the optimal parameter combination, and finally subtracting the obtained filter value from the original data to realize clutter suppression and target detection better. Due to the genetic algorithm, a maximum value with improved signal-to-clutter ratio and corresponding optimal parameter combination in which alpha is 0.999, beta is 0.992 and gamma is 0.721 can be obtained. Moreover, the target is easily obtained by using threshold detection.

Description

technical field [0001] A sea clutter suppression and target detection method based on a space tracking filter belongs to the technical field of sea clutter analysis in sea target radar detection and tracking. Background technique [0002] When the radar detects the target over the sea or close to the sea surface, it must overcome the interference of the echo of the sea itself. The sea clutter tracking filter realizes clutter suppression and target detection by modeling, tracking and removing the amplitude of the sea clutter along the radial distance unit from the original received signal. [0003] The present invention is aimed at the current sea target detection and tracking process, which is seriously affected by sea clutter. The sea clutter is obviously non-stationary and non-Gaussian due to the change of radar polarization mode, operating frequency, antenna viewing angle, sea condition, wind direction and other factors. We hope to build a real-time tracking system that...

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Application Information

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IPC IPC(8): G01S7/41
Inventor 王希勤刘一民刘静瑶孟华东
Owner TSINGHUA UNIV
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