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Non-uniform resampling technology-based maneuvering target coherent integration detection method

A technology of maneuvering target and coherent accumulation, applied in the field of coherent accumulation and detection of maneuvering targets, can solve the problems of slow detection speed and high computational complexity, and achieve the effect of avoiding search, adapting to low signal-to-noise ratio and improving detection speed.

Active Publication Date: 2019-08-06
XIDIAN UNIV
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Problems solved by technology

However, the disadvantage of this method is that all search parameters need to be traversed when constructing the detection unit graph, because this method needs to perform multi-dimensional search on the radar target parameters, which makes the calculation complexity high and the detection speed is slow
However, the disadvantage of this method is that this method uses iterative adjacent cross-correlation operations to avoid multi-dimensional search, because the repeated use of cross-correlation functions will bring additional noise terms, so the algorithm based on ACCF can only be used in high-signal Work in an environment with a noise ratio, not suitable for a working environment with a low signal-to-noise ratio

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[0047] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0048] refer to figure 1 , the specific implementation steps of the present invention are further described in detail.

[0049] Step 1, obtain the echo signal.

[0050] The radar receives the echo signal of the chirp signal transmitted by itself.

[0051] Step 2, obtain the demodulated signal.

[0052] Using the demodulation formula, the echo signal received by the radar is demodulated in the fast time domain to obtain the demodulated signal.

[0053] The demodulation formula is as follows:

[0054]

[0055] Among them, h represents the demodulation signal, r represents the echo signal received by the radar, exp represents the exponential operation with the natural constant e as the base, j represents the imaginary unit symbol, π represents the circular ratio, and z represents the carrier frequency of the chirp signal transmitted by the radar , t n I...

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Abstract

The invention relates to a non-uniform resampling technology-based maneuvering target coherent integration detection method. According to the method, demodulation and pulse compression processing areperformed on received radar receiving signals in a fast time domain; fast Fourier transformation is performed on pulse compressed signals; constraint conditions are calculated, and an empty matrix isgenerated; whether a selected time point and selected time delay meet the constraint conditions at the same time is judged, if the selected time point and selected time delay meet the constraint conditions, non-uniform resampling is performed on range-direction frequency-domain signals, corresponding element values are calculated, if the selected time and selected time delay do not meet the constraint conditions, the corresponding element values are 0; all time points and time delay are sequentially selected, generated element values are arranged into the matrix; fast Fourier transformation and inverse fast Fourier transformation are performed on correlation function matrix data, so that coherent integration is completed; and whether a target exists or not is judged by means of a coherentintegration matrix. The method disclosed by the invention is not influenced by a searching method in a detection process, is low in calculation complexity and excellent in detection performance.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a coherent accumulation detection method of a maneuvering target based on non-uniform resampling technology in the technical field of radar signal processing. The invention can be used for weak maneuvering target detection in low signal-to-noise ratio environment. Background technique [0002] Faint object detection has attracted increasing attention due to its demand in practical applications. These weak maneuvering targets have typical characteristics such as small RCS (radar cross-sectional area) and small echo energy. In order to achieve effective detection of weak maneuvering targets, it is necessary to use time-for-energy accumulation technology to accumulate energy for echo data. . Traditional radar detection methods face major challenges such as high-order range shift and Doppler frequency shift caused by long observation time. How to realize the rapid detection of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/04
CPCG01S7/418G01S13/04G01S7/411
Inventor 李明艾雅倩曹润清左磊
Owner XIDIAN UNIV
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