Object Detection Method Based on Variable-Scale Median Ratio

A technology of target detection and variable scale, which is applied to the detection of high-resolution sea search radar targets and the detection of sea surface expansion targets. Suppress clutter and other problems, to achieve the effect of solving strong fluctuations in target amplitude and avoiding manual adjustment of thresholds

Active Publication Date: 2022-06-24
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, when selecting a pure clutter reference unit, the target unit is often included, which cannot effectively suppress the clutter, or even eliminate the target
Second, medium and large targets have a high average Signal-to-Clutter Ration (SCR), but their echo power fluctuates strongly, and some echo powers are even lower than the average power of clutter
Therefore, the detection performance of non-coherent or adaptive coherent detectors under short pulses is seriously degraded, and there is a problem that a medium and large target is misidentified as multiple small targets.

Method used

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  • Object Detection Method Based on Variable-Scale Median Ratio
  • Object Detection Method Based on Variable-Scale Median Ratio
  • Object Detection Method Based on Variable-Scale Median Ratio

Examples

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Embodiment 1

[0043] The target detection method based on the variable scale median ratio of this embodiment includes the following specific steps:

[0044] 1) Read the echo data matrix z of the radar pulse signal N×M ; Among them, N represents the number of accumulated pulses, M represents the number of distance units, and the radar pulse signal is the pulse signal located in the same wave position and scanning period under the high-resolution radar fast scanning mode;

[0045] 2) For the echo data matrix z in step 1) N×M Perform incoherent pulse accumulation calculation to obtain incoherent accumulation vector where the incoherent cumulative vector The mth distance unit data of for:

[0046]

[0047] Among them, z(n,m) represents the echo data matrix z N×MThe echo data of the nth row and the mth column of ; |·| represents the modulo operation;

[0048] 3) Assume that the length dimension of the target of interest is L, and the value range of L is [L min ,L max ], then the ta...

Embodiment 2

[0072] The target detection method based on the variable scale median ratio in this embodiment, such as figure 1 shown, including the following specific steps:

[0073] 1) Obtain radar echo data:

[0074] 1.1) Read the echo data matrix z of the pulse signal of the sub-meter marine search radar in the fast scan mode N×M×I×J , the echo data matrix is ​​four-dimensional data, where N represents the number of accumulated pulses; M represents the number of distance units; I represents the number of waves; J represents the number of frames, that is, the number of scan cycles.

[0075] 1.2) In the echo data matrix z of the radar pulse signal N×M×I×J , it is usually assumed that the target of interest does not exist across wave levels and that each scanning period is independent of each other, so different wave positions and scanning periods can be processed independently. The present invention only processes the echo data of the pulse dimension and the distance dimension, that is,...

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Abstract

The invention discloses a target detection method based on variable-scale median ratio, which includes the following specific steps: acquiring radar echo data; calculating non-coherent pulse accumulation; setting small-scale parameter sets and large-scale parameter sets; calculating median energy features ; calculate the detection statistics; online perception clutter parameters; look up the table to obtain the threshold; compare the size of the test statistic and the judgment threshold to determine whether the target exists; Wave power extraction and target energy extraction in a small range, so as to solve the problem that the reference unit is the target itself at high resolution. Because the present invention uses the median ratio under variable scales, the detection statistics have the ability to resist abnormal values, and can effectively solve the problem of strong fluctuations in the target amplitude.

Description

Technical field: [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a detection method for a sea surface expansion target, which can be used for high-resolution sea search radar detection targets. Background technique: [0002] The main mission of marine radar is to detect sea surface targets, such as ships, cargo ships, passenger ships, etc. At present, for fast detection, radars operating in fast scan mode use incoherent Constant False Alarm Rate (CFAR) detectors, typically Cell Average CFAR (CA-CFAR) detectors . In addition, a series of adaptive optimal or near-optimal coherent detectors with matching clutter models are developed, including Adaptive Matched Filter (AMF) in Gaussian clutter environment, Adaptive Matched Filter (AMF) in heavy tail clutter environment Adaptive Normalized Matched Filter (ANMF), Optimum K-distributed Detector (OKD) under K distribution, Generalized Likelihood Ratio Linear Threshold De...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/414G01S7/418
Inventor 施赛楠董泽远
Owner NANJING UNIV OF INFORMATION SCI & TECH
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