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Target length estimation method based on high-resolution range profile and application thereof

A high-resolution distance image and target length technology, applied in the direction of using re-radiation, radio wave reflection/re-radiation, measuring devices, etc., can solve the problems of insufficient accuracy and inability to be widely used, and achieve high consistency and error small effect

Pending Publication Date: 2020-11-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0006] However, some object length estimation methods disclosed in the prior art, such as the length extraction method based on threshold segmentation, often have the problem of insufficient precision, and cannot be widely used.

Method used

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  • Target length estimation method based on high-resolution range profile and application thereof
  • Target length estimation method based on high-resolution range profile and application thereof
  • Target length estimation method based on high-resolution range profile and application thereof

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Experimental program
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Embodiment 1

[0224] The simulation experiment is carried out to the above-mentioned length estimation method of the present invention, and the simulation experiment uses as attached Figure 13 The radial projection of the ship shown is 100 HRRP samples with a length of 126m, and they are randomly shuffled after translation alignment and normalization preprocessing.

[0225] Through the implementation process of the present invention and outside the same steps S1 and S3, other schemes containing different steps S2 are used as a comparison, wherein:

comparative approach 1

[0227] Step S2 adopts the radial projection length extraction process based on threshold segmentation, which includes:

[0228] A1:

[0229] Suppose the original HRRP of the ship target is x(i), i=0, 1, ..., N-1, where N represents the length of the original range image sequence, and the expectation is obtained for the HRRP sequence:

[0230]

[0231] As shown in formula (20), it can be seen that the number of all strong scattering points in the original HRRP is:

[0232]

[0233] Among them, U is the unit step function, and Q is the threshold coefficient. Since the generation conditions of each HRRP are independent, the signal-to-noise ratio (SNR) is different, so it is necessary to select an appropriate threshold coefficient Q according to different SNRs.

[0234] In this embodiment, similar to the usual situation, the threshold coefficient cannot be determined simply, so an appropriate threshold coefficient Q is selected through repeated trials.

[0235] Wherein, t...

comparative approach 2

[0243] Step S2 adopts the radial projection length extraction process based on the sliding window search method, which includes:

[0244] B1:

[0245] It is assumed that the range image of the ship target includes the sequence x(n), n=0,1,...,N-1, in order to eliminate the influence of noise, the noise floor of the HRRP sample is firstly counted, and the following process is adopted:

[0246] First, select m distance cells x that do not contain targets in the original HRRP L (n) and x R (n), where x L (n) ranges from n=0,1,...,m-1,x R (n) ranges from n=N-m-1, N-m-2,..., N-1;

[0247] Afterwards, the above two paragraphs of data x are counted L (n) and x R (n) noise fluctuations, including for x L (n) and x R (n) take the average, as follows:

[0248]

[0249]

[0250] take again The average value or the maximum value of both is used as the noise fluctuation, that is, the noise floor of the original HRRP, as follows:

[0251] or

[0252] After obtaining t...

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Abstract

The invention discloses a target length estimation method based on a high-resolution range profile and application thereof, wherein the target length estimation method comprises the steps: extractingthe radial projection length features of a target in a preprocessed target sequential high-resolution range profile to obtain the sequential radial projection length of the target. According to the method, the length of the target can be accurately and stably estimated, the consistency of the estimation result and the actual length of the target is high, the error is small, and the problem of insufficient precision in target length estimation in the prior art can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of high-resolution distance images. Background technique [0002] The high-resolution range profile (HRRP) is the vector sum of the projected echoes of target scattering points obtained through broadband radar in the radar line of sight direction, which contains various information such as the distribution of target scattering points, target distance, target structure and material, etc. The identification and classification of targets and the calculation of related data are very valuable, so it has become a new technology for radar automatic target recognition. [0003] The process of identifying targets through HRRP in the prior art generally includes data preprocessing, feature extraction and selection, and classifying and identifying targets based on extracted and selected features. The purpose of data preprocessing includes overcoming the sensitivity of unprocessed HRRP data in three aspects: amplitude,...

Claims

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Application Information

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IPC IPC(8): G01S13/58
CPCG01S13/58
Inventor 张劲东尹明月杜盈蒋宜林尚东东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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