Unlock instant, AI-driven research and patent intelligence for your innovation.

A Parametric Leakage Target Detection Method Applicable to Partially Uniform Reverberation Background

A parametric and uniform technology, applied in the field of signal detection, which can solve the problems of huge computational complexity, inapplicability, and high requirements on auxiliary data length, so as to reduce computational complexity and dependencies.

Active Publication Date: 2020-06-09
INST OF ACOUSTICS CHINESE ACAD OF SCI
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only makes the calculation amount of the model very large, but also requires too high length of auxiliary data, which makes this method not applicable in the actual underwater environment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Parametric Leakage Target Detection Method Applicable to Partially Uniform Reverberation Background
  • A Parametric Leakage Target Detection Method Applicable to Partially Uniform Reverberation Background
  • A Parametric Leakage Target Detection Method Applicable to Partially Uniform Reverberation Background

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1 specifically introduces the design process of the detector, such as figure 1 Shown:

[0015] First, in the background of partial uniform reverberation, a multi-channel discrete-time model of reverberation and signal is established for the echo data to be detected. Under the leakage target model, the received echo vector z of the lth distance unit to be detected l (n) is:

[0016]

[0017] Among them, N a is the number of airspace channels of the uniform line array, N p The number of time-domain pulses received by each array element, the space-time processing dimension N=N a N p , d l (n) represents the reverberation interference component that obeys the Gaussian distribution, s l (n) represents a leakage signal component.

[0018] Leakage signal component s l (n) can be expressed as:

[0019]

[0020] where α is the unknown target magnitude factor, χ p (·,·) is the ambiguity function of the transmitted waveform, T p is the pulse width, ε 0...

Embodiment 2

[0075] Embodiment 2 is detector performance detection.

[0076] Embodiment 2 Using the Monte-Carlo simulation method to measure the detection probability P of the MP-ACE detector in a partially uniform environment d And the distance estimation error performance is analyzed, and compared with the M-ACE detector proposed by Orlando and Ricci. Considering the reliability of the simulation results, set the detection probability P d and the number of independent experiments for distance estimation error estimates were 10 4 and 10 3 , false alarm probability P fa and the number of independent trials for the Monte-Carlo simulation were 10 -4 and 100 / P fa . The target real residual delay ε is uniformly distributed in (t min +(l-1)T P -T P / 2,t min +(l-1)T P +T P / 2), where t min represents the starting moment of the sampling process. In order to ensure the fairness of the comparison, the grid search method is used to estimate the maximum value of ε, and the value range i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides a parameterization leak target detection method suitable for a part of a uniform reverberation background. The method comprises the steps of: in a part of an uniform reverberation background, establishing a multi-channel discrete time model of reverberation and signals for echo data to be detected, and employing binary hypothesis test to describe the detection problem of a leak target; employing an autoregression AR model to perform parameterization modeling of the echo data to be detected and assistant data, and employing the echo data to be detected to design adetector based on a two-step GLRT design criteria in a condition of known AR coefficient matrix and covariance matrix in the hypothesis modeling process; and employing the assistant data to perform maximum likelihood estimation of the unknown parameter matrix and the covariance matrix in the parameterization modeling, and employing an estimation value to replace the unknown parameters in the detector to obtain a parameterization leak target detector and complete adaptive detection of a unit to be detected. The parameterization leak target detection method reduces the restraint of an offshoresonar system for the assistant samples so as to improve the detection performances of small training samples while reducing the computing complexity.

Description

technical field [0001] The invention relates to the field of signal detection, in particular to a parameterized leakage target detection method suitable for partially uniform reverberation backgrounds. Background technique [0002] Active sonar is an effective means of detecting underwater stealth targets, and has been paid attention to by people in recent years. Reverberation is the main factor affecting the performance of active sonar target detection, especially in the shallow sea environment, when the sonar platform has a certain movement speed, the reverberation has the characteristics of space-time coupling, that is, the reverberation in different directions will have different Doppler frequency shift. Space-time adaptive detection (STAD) technology is an effective way to solve this problem, because it can realize implicit platform motion compensation, which allows to obtain the theoretically optimal reverberation suppression performance. [0003] For the STAD proble...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/88
CPCG01S15/88
Inventor 郝程鹏闫林杰施博闫晟徐达
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI